To see the other types of publications on this topic, follow the link: Upland river valley ecosystems.
Journal articles on the topic 'Upland river valley ecosystems'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Upland river valley ecosystems.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Sechu, Gasper L., Bertel Nilsson, Bo V. Iversen, Mette B. Greve, Christen D. Børgesen, and Mogens H. Greve. "A Stepwise GIS Approach for the Delineation of River Valley Bottom within Drainage Basins Using a Cost Distance Accumulation Analysis." Water 13, no. 6 (March 18, 2021): 827. http://dx.doi.org/10.3390/w13060827.
Full textAbstract:
River valley bottoms have hydrological, geomorphological, and ecological importance and are buffers for protecting the river from upland nutrient loading coming from agriculture and other sources. They are relatively flat, low-lying areas of the terrain that are adjacent to the river and bound by increasing slopes at the transition to the uplands. These areas have under natural conditions, a groundwater table close to the soil surface. The objective of this paper is to present a stepwise GIS approach for the delineation of river valley bottom within drainage basins and use it to perform a national delineation. We developed a tool that applies a concept called cost distance accumulation with spatial data inputs consisting a river network and slope derived from a digital elevation model. We then used wetlands adjacent to rivers as a guide finding the river valley bottom boundary from the cost distance accumulation. We present results from our tool for the whole country of Denmark carrying out a validation within three selected areas. The results reveal that the tool visually performs well and delineates both confined and unconfined river valleys within the same drainage basin. We use the most common forms of wetlands (meadow and marsh) in Denmark’s river valleys known as Groundwater Dependent Ecosystems (GDE) to validate our river valley bottom delineated areas. Our delineation picks about half to two-thirds of these GDE. However, we expected this since farmers have reclaimed Denmark’s low-lying areas during the last 200 years before the first map of GDE was created. Our tool can be used as a management tool, since it can delineate an area that has been the focus of management actions to protect waterways from upland nutrient pollution.
2
Andriesse, W., L. O. Fresco, N. Van Duivenbooden, and P. N. Windmeijer. "Multi-scale characterization of inland valley agro-ecosystems in West Africa." Netherlands Journal of Agricultural Science 42, no. 2 (June 1, 1994): 159–79. http://dx.doi.org/10.18174/njas.v42i2.607.
Full textAbstract:
Inland valleys are defined as the upper reaches of river systems. These include valley bottoms and minor floodplains,their hydromorphic fringes and upland slopes and crests. These occupy 22-52 million ha of land in W. Africa and although of good agricultural potential are only marginally used. An agro-ecological characterization developed in the Cte d'Ivoire, is outlined on 4 levels: macro (1:1 000 000-1:5 000 000), reconnaissance (1:100 000-1:250 000), semi-detailed (1:25 000-1:50 000) and detailed (1:5000-10 000). Methods of characterization at each of these levels are discussed and examples of actual application given plus the mechanisms applied in disaggregation (scaling down) and aggregation (scaling up) between levels. This approach allows: (1) a systematic description of different inland valley agro-ecosystems; (2) identification of constraints to agricultural use; (3) targeting and implemention of research; and (4) extrapolation of research results and transfer of new technology to similar areas. Studies carried out show variation in (bio)physical and land use factors is considerable. The set of descriptors now developed allows for: (1) extrapolation of the relation between biophysical driving factors and actual land use; (2) identification of geographical areas where improved management is promising; and (3) indications on the type of improvements required.
3
Carberry, Brendan, Tom A. Langen, and Michael R. Twiss. "Surface Water Quality Differs between Functionally Similar Restored and Natural Wetlands of the Saint Lawrence River Valley in New York." Land 10, no. 7 (June 27, 2021): 676. http://dx.doi.org/10.3390/land10070676.
Full textAbstract:
We tested the hypothesis that upland wetland restorations provide the same quality of wetland, in terms of ecosystem services and biodiversity, as natural wetlands in the St. Lawrence River Valley. Water quality (pH, alkalinity, colored dissolved organic matter, phytoplankton community composition, chlorophyll-a, fecal coliform, total phosphorus, dissolved nitrate, turbidity, specific conductivity) in 17 natural and 45 restored wetlands was compared to determine whether wetland restoration provided similar physicochemical conditions as natural wetlands in the Saint Lawrence River Valley of northeastern New York State. Natural wetlands were more acidic, which was hypothesized to result from the avoidance of naturally acidic regions by farmers seeking to drain wetlands for crop and pasture use. Natural wetlands had significantly greater fecal coliform concentrations. Restored wetlands had significantly greater specific conductivity and related ions, and this is attributed to the creation of wetlands upon marine clay deposits. Other water quality indicators did not differ between restored and natural wetlands. These findings confirm other research at these same wetlands showing no substantial differences between restored and natural wetlands in major biotic indicators. Thus, we conclude that wetland restoration does result in wetlands that are functionally the same as the natural wetlands they were designed to replicate.
4
Yin, Guoan, Hao Zheng, Fujun Niu, Jing Luo, Zhanju Lin, and Minghao Liu. "Numerical Mapping and Modeling Permafrost Thermal Dynamics across the Qinghai-Tibet Engineering Corridor, China Integrated with Remote Sensing." Remote Sensing 10, no. 12 (December 19, 2018): 2069. http://dx.doi.org/10.3390/rs10122069.
Full textAbstract:
Permafrost thermal conditions across the Qinghai–Tibet Engineering Corridor (QTEC) is of growing interest due to infrastructure development. Most modeling of the permafrost thermal regime has been conducted at coarser spatial resolution, which is not suitable for engineering construction in a warming climate. Here we model the spatial permafrost thermal dynamics across the QTEC from the 2010 to the 2060 using the ground thermal model. Soil properties are defined based on field measurements and ecosystem types. The climate forcing datasets are synthesized from MODIS-LST products and the reanalysis product of near-surface air temperature. The climate projections are based on long-term observations of air temperature across the QTEC. The comparison of model results to field measurements demonstrates a satisfactory agreement for the purpose of permafrost thermal modeling. The results indicate a discontinuous permafrost distribution in the QTEC. Mean annual ground temperatures (MAGT) are lowest (<−2.0 °C) for the high mountains. In most upland plains, MAGTs range from −2.0 °C to 0 °C. For high mountains, the average active-layer thickness (ALT) is less than 2.0 m, while the river valley features ALT of more than 4.0 m. For upland plains, the modeled ALTs generally range from 3.0 m to 4.0 m. The simulated results for the future 50 years suggest that 12.0%~20.2% of the permafrost region will be involved in degradation, with an MAGT increase of 0.4 °C~2.3 °C, and the ALT increasing by 0.4 m~7.3 m. The results of this study are useful for the infrastructure development, although there are still several improvements in detailed forcing datasets and a locally realistic model.
5
Novak, Taras. "Correlation of the river valleys terraces of the Volhynian Upland based on morphological and lithological features." Visnyk of the Lviv University. Series Geography, no. 49 (December 30, 2015): 253–65. http://dx.doi.org/10.30970/vgg.2015.49.8639.
Full textAbstract:
River valleys of Volhynian Upland are characterized by a larger number of terraces and a greater depth of their downcutting compared with neighbouring Polissia and Male Polissia. We established that the major rivers of Volhynian Upland have floodplain and mostly three terraces. The valley of the Horyn River is different from others by presence of fourth terrace. According to received information, the age of forming of the highest terrace (revealed only in the Horyn Valley) can be considered as Early Pleistocene, the third terrace – Middle Pleistocene, and the two lowest terraces – Late Pleistocene. Relief of the Early and Middle Pleistocene terraces is characterized by high degree of dissection and presence of sufficiently thick loess cover. At higher Late Pleistocene terrace loess cover isn’t revealed everywhere and has a small thickness (typically up to 5 m). The lowest terrace in most valleys has local distribution and it is composed mainly of sandy material. The surface of this terrace is located on several hypsometric levels. Floodplain usually has two high-rise levels. It formed in the Holocene. Key words: river valley, terrace, floodplain, Volhynian Upland, Horyn River, Styr River, Zakhidnyi Buh River.
6
Mathews, William H., J. Ross Mackay, and Glenn E. Rouse. "Pleistocene geology and geomorphology of the Smoking Hills Upland and lower Horton River Arctic coast of mainland Canada." Canadian Journal of Earth Sciences 26, no. 9 (September 1, 1989): 1677–87. http://dx.doi.org/10.1139/e89-144.
Full textAbstract:
The Smoking Hills Upland and lower Horton River valley, on the Arctic coast of Canada 300 km east of the Mackenzie Delta, retain an extended record of subaerial erosion of nearly flat-lying Cretaceous shales. This erosion led to the development of (i) a very gently sloping low-relief upland surface (Early Pleistocene(?)), (ii) a slightly steeper intermediate surface, and (iii) younger steep valley walls, terraces, and broad valley bottoms. No direct glacial contribution to any of these landforms can be recognized. An early interglacial(?) fluvial episode is recorded in plateau-cap sediments. Suggestions of an early (mid-Pleistocene or earlier) glaciation overwhelming the Smoking Hills Upland are found in (i) anomalies in drainage patterns, (ii) disturbances in bedding, believed to have been caused by ice thrusting, and (iii) local occurrences of diamictons. Later, probably Early Wisconsinan, glaciation left meltwater channels in peripheral areas. The Late Wisconsinan ice sheet did not reach the Smoking Hills Upland but may have had an indirect influence by modyfying discharge and sediment transport of Horton River.
7
Jaros, Henryk. "Physiographic factors affecting the stratigraphy of peat deposits in the Lower Basin of the Biebrza River / Czynniki fizjograficzne wpływające na stratygrafię złoża torfu w Dolnym Basenie Doliny Biebrzy." Journal of Water and Land Development 17, no. 1 (December 1, 2012): 69–76. http://dx.doi.org/10.2478/v10025-012-0035-7.
Full textAbstract:
Abstract Analyses of water conditions in the Lower Basin of the Biebrza River and deposit stratigraphy were conducted in cross-sections through the valley, where geodetic measurements were also made. Peat type in particular layers of the soil profile was determined in selected cross-sections at 100 m intervals. The Lower Basin of the Biebrza River is diverse with regard to the type of water supply to a peatbog, the shape of the bio-accumulative basin’s bottom and the slope of peatbog surface along and across the valley. These factors resulted in the development of different habitats in the peatbog. Northern part of the Lower Basin, between the main road in the village Osowiec and the inflows of the Kosódka and Wissa rivers to the Biebrza River, is a narrow valley supplied mainly with overflowing water of the Biebrza River. Habitats and hydrogenic deposits of this area developed in relation to the type and layout of mineral substratum and to the duration and depth of seasonal flooding. North-west part is mainly supplied by ground water from the adjacent upland. Peat layers, developed on ground waters flowing out from the upland, markedly slope toward the bed of the Biebrza River. Considerable fluctuations of the ground water level can be observed there and most frequently the sites are periodically drying. Part of the valley, from the inflows of the Kosódka and Wissa rivers down to the Biebrza and Narew River confluence, is mainly supplied with underground waters from upland.
8
Ukraintsev, V. Yu, and I. S. Voskresenskiy. "Structure and Late Cenozoic Development of Valleys at the Severnye Uvaly Upland." Вестник Пермского университета. Геология 19, no. 4 (2020): 303–16. http://dx.doi.org/10.17072/psu.geol.19.4.303.
Full textAbstract:
Using public materials (articles, open-file reports of geological survey at the Severnye Uvaly, and digital elevation models), we studied river valleys of the Severnye Uvaly Upland and established specific types of gold placer-like occurrences and interconnection between river valley structure and placer location. We distinguished 4 cycles of erosion in Late Cenozoic at the Severnye Uvaly. For placer forming, the one of the most important features is a spatial coincidence of valleys in every cycle of erosion. An analysis of the longitudinal and transverse profiles of the valleys according to the DSM allows evaluating the content of the gold and its location in the river valley.
9
Krieglsteiner, Lothar, and Maria Ławrynowicz. "Hymenochaete carpatica from Częstochowa Upland (S Poland)." Acta Mycologica 38, no. 1-2 (August 20, 2014): 27–30. http://dx.doi.org/10.5586/am.2003.003.
Full textAbstract:
Hymenochaete carpatica has been found in 1994 in Czętochowa Upland, "Parkowre" nature reserve, in Wiercica river valley situated on calcareous area, 290-310 m above see level, on fissured bark of Acer pseudoplatanus. This contribution corresponds to the paper by Chlebicki (2003) who has recently discovered scveral localities of H. carpatica in Sudetes and Carpathians. Both papers present a set of sites of H. carpatica reported hitherto from Poland, and contribute to the knowledge on its distribution in Europe.
10
Szymczyk, Rafał, and Anna Zalewska. "Lichen Biota of the Grabianka River Valley in the Elbląg Upland (Wysoczyzna Elbląska)." Polish Journal of Natural Science 23, no. 2 (June 1, 2008): 398–414. http://dx.doi.org/10.2478/v10020-008-0031-1.
Full text
11
Demkin, V. A., N. N. Kashirskaya, T. S. Demkina, T. E. Khomutova, and M. V. El’tsov. "Paleosol studies of burial mounds in the Ilovlya River valley (the Privolzhskaya Upland)." Eurasian Soil Science 41, no. 2 (February 2008): 115–27. http://dx.doi.org/10.1134/s1064229308020014.
Full text
12
Barabas, Dušan, and Matúš Tkáč. "Analysing riverbed morphology as a response to changes of geological and neotectonic conditions: A case study of the oľšava river." Quaestiones Geographicae 38, no. 3 (September 10, 2019): 109–22. http://dx.doi.org/10.2478/quageo-2019-0033.
Full textAbstract:
Abstract The morphological examination of the Slovak Oľšava River channel and valley parameters is based on observation of changes in the troughs’ longitudinal profile. While the relationship between valley and channel parameters has previously been researched, establishment of the diverse conditions in trough formation enables better understanding of the basin/riverbed relationship. Our research is based on field measurements of representative sections of nine segments defined by changes in the longitudinal profile. The field measurements were performed in autumn months during a low water period to ensure the best conditions for repeated measurements. Significantly, as much as 75% asymmetry of the measured flow encourages the assumption of strong tectonic influence on the riverbed formation. While the difference between the assumed continuous changes of measured parameters and the actual measured or evaluated parameters remains a matter of interpretation, the detected anomalies enable interpretation of the parameters’ relationships. The river bed and the valley morphological parameters were evaluated on the model of The Olšava River basin which drains the eastern part of the Košická kotlina Basin (the Toryská pahorkatina Upland). The location of the basin at the foot of the Slanské vrchy Mts. is an important factor in the formation of the river network asymmetries. Both the Neogene contact between the Slanské vrchy Hills neo-volcanites and the Toryská pahorkatina Upland and the neo-tectonics influenced the change in morphological parameters in the valley’s longitudinal and transverse profile and the Oľšava river bed. Our terrain works comprised length and width measurements of the bars, their positions in the river bed, the width and depth of the channel and the type of section riffle. Available maps enabled calculation of the following; ratio of valley height to width, average gradient of the section, stream gradient index, average channel segment slope, the degree of sinuosity and the highest observed correlation between slope, river segment type (0.9576) and the width and type river reach (−0.9089). High correlation coefficient values were recorded for the valley height and width ratio, the type of river section, the water area and the total river bed width and area.
13
Eastoe, Christopher J. "Sources of Perennial Water Supporting Critical Ecosystems, San Pedro Valley, Arizona." Environmental and Engineering Geoscience 26, no. 4 (November 1, 2020): 463–79. http://dx.doi.org/10.2113/eeg-d-20-00040.
Full textAbstract:
ABSTRACT Stable O and H isotope data distinguish three sources for base flow in five reaches of the San Pedro River: (A) base flow and sub-flow from upstream reaches of the river; (B) bank storage derived from summer monsoon floodwater; and (C) water from the mountainous flanks of the river catchment. A and C support base flow in the sub-basin upstream of Sierra Vista. A, B, and C combine to support base flow near St. David. Source C in this area is ancient deep-basin groundwater. Source C dominates in Cascabel near Benson Narrows, with downstream additions from A. In Cascabel near Gamez Road, sources A and C combined to support base flow that had disappeared by 2019. Near Redington, source C appears to have operated through a limestone aquifer vulnerable to short-term drought. Groundwater sub-basins separated by impermeable sills in the riverbed are evolving into hydrologically separate sub-basins as base flow across the sills decreases. The decrease in base flow partly reflects regional long-term drought, which has been exacerbated by pumping. Additional groundwater demand from urban growth upstream of Benson is likely to cause further decline of base flow near St. David and Sierra Vista.
14
Hnatyuk, Roman, and Taras Novak. "Low terraces of the Styr River valley in the middle part of the Volhyn Upland." Visnyk of the Lviv University. Series Geography, no. 50 (December 28, 2016): 101–18. http://dx.doi.org/10.30970/vgg.2016.50.8686.
Full textAbstract:
The paper focuses on the description of the low Pleistocene terraces (with the height of up to 20 m above the river level) of the Styr River valley that were identified in the middle part of the upland between Bilche–Krasne villages in the south and Boratyn–Pidhaitsi villages in the north. The main attention is concentrated on the mapping of the terraces and the overview of their outcrops as well as analysis of the boreholes data. The study of the geological structure of the terraces becomes the basis to determine their age. Mapping of river terraces was executed using topographic maps in scale 1:10 000. On the territory where previous researchers identified one or two terraces, we have identified five morphologically distinct cyclic (paired) terraces. The highest low terrace that is widespread territorially is named here the main terrace and the other four that are locally preserved are combined in a complex of minor low terraces. The level of the main Styr terrace has almost constant altitude of about 191–192 m. The average height of the terrace surface is gradually increasing downstream from 12–13 to 14–16 m above river level. Its surface is slightly undulating and complicated by relatively large isometric depressions with the diameter of up to 100 m and more. The slightly meandering forms similar to channels with the plan size comparable with the modern Styr channel occur on the terrace surface. The main terrace is relatively complicated and has mainly two-termed structure – the lower part of sedimentary sequence is composed of normal (perstrative) alluvium of large thickness; the upper part is composed of constrative alluvium accumulated when the river channel was laterally inactive. The terrace is overbuilt by a loess layer a few meters thick that covers floodplain alluvium without a distinct break in accumulation. Geological structure of the minor low terraces is relatively simple and recalls the floodplain structure. Absence of well-expressed paleosols in the alluvial and loess deposits of the low terraces suggests that they were formed during Late Pleniglacial (MIS 2). Key words: river terrace, alluvium, Late Pleistocene, Late Pleniglacial, Volhyn Upland, Styr River valley.
15
Bianchi, Valeria, Tristan Salles, Massimiliano Ghinassi, Paolo Billi, Edoardo Dallanave, and Guillaume Duclaux. "Numerical modeling of tectonically driven river dynamics and deposition in an upland incised valley." Geomorphology 241 (July 2015): 353–70. http://dx.doi.org/10.1016/j.geomorph.2015.04.007.
Full text
16
Stelmaszczyk, Mateusz, Tomasz Okruszko, and Patrick Meire. "Nutrients availability and hydrological conditions of selected wetland ecosystems in the Biebrza river valley." Annals of Warsaw University of Life Sciences, Land Reclamation 47, no. 1 (March 1, 2015): 3–17. http://dx.doi.org/10.1515/sggw-2015-0010.
Full textAbstract:
Abstract: Nutrients availability and hydrological conditions of selected wetland ecosystems in the Biebrza river valley. Paper presents results of investigation of hydrological conditions and nutrients limitation and availability for wetland vegetation in selected sites within Biebrza river valley. Analysed sites were overgrown by tall sedge Magnocaricion vegetation (Caricetum gracilis and Caricetum elatae), wet meadow Molinio-Arrhenatheretea vegetation (Molinietum caeruleae), and sedge-moss Scheuchzerio-Caricetea nigrae vegetation (Caricetum lasiocarpae). There were noted a close relationship between vegetation types, hydrological regimes and kind of nutrient limitation. Low productive Molinio-Arrhenatheretea and Scheuchzerio-Caricetea nigrae vegetations fed mainly by groundwater were limited by phosphorus, while highly productive Magnocaricion vegetation, fed by river water, was subjected to nitrogen limitation. We have found big diversification of groundwater and surface water levels within habitats of different vegetation types along the Biebrza river valley. Magnocaricion vegetation present on flooded areas is characterized by significant water level fluctuations and long-lasting inundations. On areas covered by Molinio-Arrhenatheretea vegetation we noted majority of water levels not exceeding the level of the ground surface. Whereas Scheuchzerio-Caricetea nigrae vegetation, fed by groundwater, is characterized by low variation of groundwater levels.
17
Baker, Matthew E., and Burton V. Barnes. "Landscape ecosystem diversity of river floodplains in northwestern Lower Michigan, U.S.A." Canadian Journal of Forest Research 28, no. 9 (September 1, 1998): 1405–18. http://dx.doi.org/10.1139/x98-107.
Full textAbstract:
We present a classification and comparison of river floodplains using an ecological, multifactor approach integrating physiography, hydrology, soil, and vegetation within a relatively homogenous macroclimate. Aerial photographs and field reconnaissance were used to locate 22 river valley transects along nine major rivers in the Manistee National Forest, northwestern Lower Michigan. Distinct ecosystems along each transect were sampled extensively. Twenty-three floodplain ecosystem types were identified and classified primarily on the basis of physiographic systems and fluvial landforms within a regional context. Physiographic systems are broad-scale, surficial landforms characterized by distinctive form, parent material, soil, hydrologic regimes, and vegetation. We examined landscape ecosystem differences between different physiographic systems, within a physiographic system, and on a single fluvial landform. Different physiographic systems have different kinds and patterns of floodplain ecosystems in successive valley segments along a river. Within a physiographic system, the physiographic position of different fluvial landforms and ecosystem types within a single fluvial landform leads to marked ecosystem diversity laterally away from the river. The results indicate that physiography is an important determinant of floodplain ecosystem diversity and that an ecological, multifactor approach is useful in distinguishing floodplain ecosystems at multiple scales within a regional context.
18
Wright, David K., Scott MacEachern, Stanley H. Ambrose, Jungyu Choi, Jeong-Heon Choi, Carol Lang, and Hong Wang. "Iron Age landscape changes in the Benoué River Valley, Cameroon." Quaternary Research 92, no. 2 (June 28, 2019): 323–39. http://dx.doi.org/10.1017/qua.2019.25.
Full textAbstract:
AbstractThe introduction of agriculture is known to have profoundly affected the ecological complexion of landscapes. In this study, a rapid transition from C3 to C4 vegetation is inferred from a shift to higher stable carbon (13C/12C) isotope ratios of soils and sediments in the Benoué River Valley and upland Fali Mountains in northern Cameroon. Landscape change is viewed from the perspective of two settlement mounds and adjacent floodplains, as well as a rock terrace agricultural field dating from 1100 cal yr BP to the recent past (<400 cal yr BP). Nitrogen (15N/14N) isotope ratios and soil micromorphology demonstrate variable uses of land adjacent to the mound sites. These results indicate that Early Iron Age settlement practices involved exploitation of C3 plants on soils with low δ15N values, indicating wetter soils. Conversely, from the Late Iron Age (>700 cal yr BP) until recent times, high soil and sediment δ13C and δ15N values reflect more C4 biomass and anthropogenic organic matter in open, dry environments. The results suggest that Iron Age settlement practices profoundly changed landscapes in this part of West Africa through land clearance and/or utilization of C4 plants.
19
Ramchunder, S. J., L. E. Brown, and J. Holden. "Environmental effects of drainage, drain-blocking and prescribed vegetation burning in UK upland peatlands." Progress in Physical Geography: Earth and Environment 33, no. 1 (February 2009): 49–79. http://dx.doi.org/10.1177/0309133309105245.
Full textAbstract:
Peatlands are important ecosystems for carbon (C) storage, provision of water resources and biodiversity. UK blanket peats represent 10—15% of those found worldwide. While many peatlands continue to be managed through artificial drainage and vegetation burning, it has long been recognized that local habitats and ecological diversity are strongly influenced by these practices. This paper reviews the hydrological, physicochemical and ecological effects of three widespread UK peatland management practices, namely artificial drainage, drain-blocking and rotational heather burning. Drainage and burning of peat often lead to altered runoff regimes, oxidation of organic matter, changes to C, nitrogen (N) and phosphorus (P) cycling, and increased metal and suspended sediment concentrations in streams relative to intact peatlands. Although artificial drainage is now rarely implemented on UK upland peats, a great number of historical drains remain, thus drain-blocking is increasingly being applied to restore many peatlands. In contrast, recent increases in the intensity and extent of rotational heather burning may result in further changes to peatland ecosystems. Relatively little is known about the environmental effects of rotational heather burning compared with drainage and drain-blocking management, and for all three of these management techniques there is scarce information on river ecosystem response. We hypothesize some likely effects of basin-scale drainage, drain-blocking and heather burning on stream ecosystems and illustrate these with a schematic model. Such a holistic consideration of peatland river basins is particularly timely with respect to the implementation of the EU Water Framework Directive.
20
Hardy, Andrew. "The Road to Bò Rạ: Travel, Settlement and Contact on a Vietnamese Upland Frontier." Journal of Southeast Asian Studies 31, no. 2 (September 2000): 295–320. http://dx.doi.org/10.1017/s0022463400017574.
Full textAbstract:
An account based on fieldwork, "The Road to Bd Ra" portrays the settlement of a river valley in Vietnam's northern uplands, and also explores the relationship between settlers and other ethnic groups. A local history approach and emphasis on travel as research perspective are used to examine geographical and administrative processes common to many parts of Vietnam's upland frontier.
21
Clausen, Eric. "North Platte River-South Platte River Confluence Area Drainage System History as Determined by Topographic Map Interpretation: Western Nebraska, USA." Journal of Geography and Geology 12, no. 2 (August 31, 2020): 28. http://dx.doi.org/10.5539/jgg.v12n2p28.
Full textAbstract:
Detailed topographic maps of the western Nebraska North Platte River-South Platte River confluence area show a low relief and gently sloping southeast-oriented upland surface, asymmetrical drainage divides, nearly adjacent and parallel east-oriented North and South Platte River valley segments, barbed tributaries, and shallow divide crossings (low points along drainage divides) in a region south of the Nebraska Sand Hills and at the Nebraska loess region’s western margin. Published interpretations of North and South Platte River confluence area landforms (referred to as the accepted paradigm) do not explain most drainage features and are compared with a new paradigm’s interpretations to determine which of the two paradigms explains the regional drainage history and related surface features in a simple and consistent manner. New paradigm interpretations require large sheets of slowly-moving southeast-oriented water to have flowed toward what was probably an actively eroding Republican River valley and to have shaped the upland surface while the Platte and North and South Platte River valleys eroded headward into and across the region so as to create the asymmetric drainage divides, barbed tributaries, and shallow divide crossings. These new paradigm interpretations are consistent with each other and with recently published new paradigm interpretations of upstream North and South Platte River drainage system history. New paradigm interpretations also suggest the adjacent Nebraska Sand Hills developed on a large flood deposited delta (typical of sand dune areas on former glacial lake deltas further to the north) and the slowly-moving sheets of water may have been responsible for some or all of Nebraska’s loess deposits, although the new paradigm leads to a fundamentally different middle and late Cenozoic regional geologic and glacial history than what workers using the accepted paradigm have described.
22
Froese, Duane G., Derald G. Smith, John A. Westgate, Thomas A. Ager, Shari J. Preece, Amanjit Sandhu, Randolph J. Enkin, and Florence Weber. "Recurring middle Pleistocene outburst floods in east-central Alaska." Quaternary Research 60, no. 1 (July 2003): 50–62. http://dx.doi.org/10.1016/s0033-5894(03)00090-5.
Full textAbstract:
AbstractRecurring glacial outburst floods from the Yukon-Tanana Upland are inferred from sediments exposed along the Yukon River near the mouth of Charley River in east-central Alaska. Deposits range from imbricate gravel and granules indicating flow locally extending up the Yukon valley, to more distal sediments consisting of at least 10 couplets of planar sands, granules, and climbing ripples with up-valley paleocurrent indicators overlain by massive silt. An interglacial organic silt, occurring within the sequence, indicates at least two flood events are associated with an earlier glaciation, and at least three flood events are associated with a later glaciation which postdates the organic silt. A minimum age for the floods is provided by a glass fission track age of 560,000 ± 80,000 yr on the GI tephra, which occurs 8 m above the flood beds. A maximum age of 780,000 yr for the floods is based on normal magnetic polarity of the sediments. These age constraints allow us to correlate the flood events to the early-middle Pleistocene. And further, the outburst floods indicate extensive glaciation of the Yukon-Tanana Upland during the early-middle Pleistocene, likely representing the most extensive Pleistocene glaciation of the area.
23
Raeside, Rob, and Amy Tizzard. "Basement-cover relations in the southeastern Cape Breton Highlands, Nova Scotia, Canada." Atlantic Geology 51, no. 1 (September 7, 2015): 298. http://dx.doi.org/10.4138/atlgeol.2015.013.
Full textAbstract:
In the southeastern Cape Breton Highlands Neoproterozoic plutonic and metamorphic rocks outcrop in upland areas whereas Carboniferous sedimentary rocks are found in the river valleys and coastal lowlands. Detailed analysis of the contacts between these two groups of rocks including mapping, geometric constructions of the contact relations, structural geological investigations, petrographic analysis and geophysical map interpretations show that the basement rocks were emplaced by a thrust fault that extends at least from the Baddeck River valley to North River, and possibly includes klippen south and east of the highlands. The thrust fault transported a slab of rock with minimum thickness of 200 m a distance of at least 8 km over Horton and Windsor group rocks. East-directed translation of the thrust block likely occurred during the Alleghanian orogeny, and appears to mirror movement previously identified in the northern and western Cape Breton Highlands, implying that much of the upland geology is allochthonous, but likely rooted in the central highlands as positive flower structure.
24
Goss, Kevin F. "Environmental flows, river salinity and biodiversity conservation: managing trade-offs in the Murray - Darling basin." Australian Journal of Botany 51, no. 6 (2003): 619. http://dx.doi.org/10.1071/bt03003.
Full textAbstract:
The Murray–Darling basin's river system suffers from over-allocation of water resources to consumptive use and salinity threats to water quality. This paper draws attention to the current state of knowledge and the need for further investigations into the biological effect of river salinity on aquatic biota and ecosystems, the threats of dryland salinity to terrestrial biodiversity, and managing environmental flows and salinity control to limit the trade-offs in water-resource security and river salinity.There is growing evidence that river salt concentrations lower than the normally adopted threshold have sublethal effects on species and ecosystems, over a longer time period. Further knowledge is required.There is no agreed process for incorporating terrestrial biodiversity values at risk into a strategic response for dryland-salinity management. This is a public policy issue to be addressed.Recent studies have quantified the trade-off in surface water flow and river salinity from refforestation and revegetation of upland catchments to control salinity. The potential losses or benefits to environmental values have not been quantified.Such improved knowledge is important to the Murray–Darling basin and relevant to other river basins and catchments in Australia.
25
Murphy, Michael L., Jonathan Heifetz, John F. Thedinga, Scott W. Johnson, and K. V. Koski. "Habitat Utilization by Juvenile Pacific Salmon (Onchorynchus) in the Glacial Taku River, Southeast Alaska." Canadian Journal of Fisheries and Aquatic Sciences 46, no. 10 (October 1, 1989): 1677–85. http://dx.doi.org/10.1139/f89-213.
Full textAbstract:
Habitat utilization was determined in summer 1986 by sampling 54 sites of nine habitat types: main channels, backwaters, braids, channel edges, and sloughs in the river; and beaver ponds, terrace tributaries, tributary mouths, and upland sloughs on the valley floor. Physical characteristics were measured at all sites, and all habitats except main channels (current too swift for rearing salmon) were seined to determine fish density. Sockeye (Oncorhynchus nerka) averaged 23 fish/100 m2, nearly twice the density of coho (O. kisutch) and four times that of chinook (O. tshawytscha), 14 and 6 fish/100 m2, respectively. Sockeye were age 0, 27–84 mm fork length (FL), and most abundant in upland sloughs, beaver ponds, and tributary mouths. Coho were ages 0 and 1, 33–132 mm FL, and most abundant in beaver ponds and upland sloughs. Chinook were age 0, 40–93 mm FL, and more abundant than the other species in habitats with faster currents (1–20 cm/s), particularly channel edges. Each species was absent from about one-quarter of the seining sites of each habitat type. Thus, the lower Taku River provides important summer habitat for juvenile salmon, but many suitable areas were unoccupied, possibly because of their distance from spawning areas and poor access for colonizing fish.
26
Hix, David M. "Multifactor classification and analysis of upland hardwood forest ecosystems of the Kickapoo River watershed, southwestern Wisconsin." Canadian Journal of Forest Research 18, no. 11 (November 1, 1988): 1405–15. http://dx.doi.org/10.1139/x88-219.
Full textAbstract:
An ecological multifactor approach was used to develop a hierarchical classification of upland hardwood forest ecosystems of the Kickapoo River watershed, southwestern Wisconsin. This method was chosen from among the variety available because of its utility in this area of heavily disturbed forests. Eleven major ecosystem units were distinguished for the 67 plot areas sampled. Each ecosystem unit is characterized by a distinct combination of physiography (aspect and slope position and steepness), soil (parent material depth and type), and vegetation (canopy tree species and groups of ground cover species), and occurs in a unique position in the landscape. The canopies of most units are dominated by combinations of northern red oak (Quercusrubra L.), white oak (Q. alba L.), and sugar maple (Acersaccharum Marsh.). The results of several discriminant analyses indicate a high level of association between plots within some units. A combination of physiographic, soil, and vegetational variables resulted in the highest overall percentage of correct classification of the plots. These 11 ecosystem units ranged in estimated productivity (average site index for northern red oak) from 12 to 21 m, with the two extremes significantly different at the 5% level.
27
Bettis, E. Arthur, Richard G. Baker, Brenda K. Nations, and David W. Benn. "Early Holocene Pecan, Carya Illinoensis, in the Mississippi River Valley Near Muscatine, Iowa." Quaternary Research 33, no. 1 (January 1990): 102–7. http://dx.doi.org/10.1016/0033-5894(90)90088-3.
Full textAbstract:
AbstractA fossil pecan, Carya illinoensis (Wang.) K. Koch, from floodplain sediments of the Mississippi River near Muscatine, Iowa, was accelerator-dated at 7280 ± 120 yr B.P. This discovery indicates that pecan was at or near its present northern limit by that time. Carya pollen profiles from the Mississippi River Trench indicate that hickory pollen percentages were much higher in the valley than at upland locations during the early Holocene. Pecan, the hickory with the most restricted riparian habitat, is the likely candidate for producing these peaks in Carya pollen percentages. Therefore, pecan may have reached its northern limit as early as 10,300 yr B.P. Its abundance in Early Archaic archaeological sites and the co-occurrence of early Holocene Carya pollen peaks with the arrival of the Dalton artifact complex in the Upper Mississippi Valley suggest that humans may have played a role in the early dispersal of pecan.
28
Nowacki, Janusz, and Roman Wąsala. "Revisional notes on the distribution of noctuid moths (Lepidoptera: Noctuoidea: Erebidae, Noctuidae) from the xerothermic hills above the River Nida valley, southern Poland." Polish Journal of Entomology 1, no. 89 (March 30, 2020): 20–25. http://dx.doi.org/10.5604/01.3001.0014.0299.
Full textAbstract:
As a result of the revision of the noctuid moths (Lepidoptera: Noctuoidea) collection of A. S. Kostrowicki from the River Nida valley (Małopolska Upland, southern Poland) from mid-20th century, and recent fieldwork, a total of 37 species of noctuid moths are listed for the first time from the xerothermic hills of this area. One species, Pechipogo plumigeralis (Hübner, 1825), is formally removed from the checklist of Polish fauna of Lepidoptera.
29
Babenko, Vitaly A., and Yuri D. Obukhov. "Monuments from Area Town of Madjary (the North Caucasus): current research developments." Povolzhskaya Arkheologiya (The Volga River Region Archaeology) 2, no. 36 (June 25, 2021): 216–30. http://dx.doi.org/10.24852/pa2021.2.36.216.230.
Full textAbstract:
The paper features the problem of selection of Golden Horde era sites located in the area neighbouring the town of Majary in the territory of the Middle Kuma valley. The bulk of information about the sites is mostly contained in archival documents relating to the 16th – 18th centuries. At present there is information about 9 sites. The locations of five of them have been discovered. Two sites could possibly be locations of the towns of Majary-al-Jedid and Karakogun, which are known due to numismatic and written sources. The medieval climate and landscape in the region allowed to a certain extent cultivating the Kuma river valley, prone to seasonal flooding. Permanent settlements in the area neighbouring Majary could have been founded in the Upland of the Kuma river valley or the terrace areas above the flood plain in the Kuma river valley or the Kuma tributaries. The areas of the estuaries of the left and the right tributaries of the Kuma river seem promising for the search of Golden Horde era artefacts of everyday life. The sites (“Orlovskoye-1”, 13th – 14th centuries, “Preobrazhenskoye-1”) which are situated in the neighborhood of the Madjary hillfort could relate to the rural area around Majary. Specification of a number of sites situated in some distance from Majary requires a more precise definition.
30
Krawczyk, Rafał. "Influence of natural and anthropogenic factors on the distribution of xerothermic plants in the lower San river valley (SE Poland)." Acta Agrobotanica 65, no. 1 (2012): 107–14. http://dx.doi.org/10.5586/aa.2012.048.
Full textAbstract:
The aim of the present study was to describe the distribution of xerothermic species of vascular plants in the lower San River valley and the relationship between their density and the intensity of selected environmental (natural and anthropogenic) factors. Xerothermic species occurred more frequently in the present valley floor compared to the glacial terrace. Within the present valley, the highest density was observed in the floodplain. The examined species also occurred more often on steep slopes of the valley, at the margins of the present valley terraces, and in the area of occurrence of aeolian sands. Moreover, a positive correlation has been found between the number of xerothermic species and the area of polyhemeroby ecosystems. The distribution of xero- and thermophilous species is determined by natural edaphic and geomorphological factors as well as anthropogenic ones (land use, lowering of the groundwater level as a result of river regulation).
31
Tagunova, Ye O. "Peculiarities of manganese and lead distribution in soils of Samara Dniprovska river valley ecosystems." Ecology and Noospherology 25, no. 3-4 (October 8, 2014): 84–90. http://dx.doi.org/10.15421/031423.
Full textAbstract:
Microelemental characteristics of the edaphotopes of A. L. Belgard Prysamarsky International Biospheric Station (Dnieper Prisamaria region, Ukraine) by example of forb-fescue-stipa steppe and lime-ash oakery of the central floodplain are presented. The content and patterns of distribution of Manganese and Lead in soil profiles were researched.
32
Czarnobaj, Jurij, and Olga Jaworncka. "WPŁYW FRAGMENTACJI NA MEZOFAUNĘ GLEBOWĄ W EKOSYSTEMACH GÓRNEGO DNIESTRA." Zarządzanie ochroną przyrody w lasach XII (June 30, 2019): 1. http://dx.doi.org/10.5604/01.3001.0013.2815.
Full textAbstract:
Fragments of forest ecosystems, secondary bushes and meadows within the borders of the alluvial valley of the upper Dniester river are located (the western region of Ukraine). The conservative nature of the pedobionts complexes allows us to form a sozology strategy for the renewal of the primary ecosystems, or the stabilization of secondary forest logging and meadows communities. The quantitative and qualitative indicators of the individual groups of soil mesofauna are estimated
33
Кривцов, В. А., А. В. Водорезов, and Е. М. Никифорова. "Tourist and Recreational Potential of the Pronya River Valley in the Ryazan Region of the Central Russian Upland." Вестник Рязанского государственного университета имени С.А. Есенина, no. 2(71) (July 7, 2021): 140–59. http://dx.doi.org/10.37724/rsu.2021.71.2.015.
Full textAbstract:
В предлагаемой статье раскрыты некоторые возможности использования геоморфологических объектов в центре Русской равнины в развитии рекреации и познавательного туризма на примере территории долины реки Прони. Сделан краткий обзор научных работ, посвященных вопросам роли рельефа как условия туристско-рекреационной привлекательности территории, рекреационно-геоморфологического потенциала территории, методам рекреационно-геоморфологического картографирования. Показаны возможности развития экологического туризма в пределах действующих и проектируемых особо охраняемых природных территорий, рельеф которых заметно обусловливает геоботаническую и ландшафтную мозаику территории, формирует редкие и уникальные урочища. Выявлена низкая посещаемость рекреантами долины реки Прони при наличии высокого туристско-рекреационного потенциала долины для развития культурно-экологи-ческого и познавательного туризма, который был определен с учетом данных, характеризующих особенности строения и развития долины, проявление современных экзогенных рельефообразующих процессов, в том числе антропогенных, роль морфолитогенной основы в размещении поселений и специфике хозяйственного освоения долины, в дифференциации региональных ландшафтов и сохранении их естественного облика, в привлекательности отдельных форм и комплексов форм рельефа. Выделены отдельные участки, перспективные для развития природно- и культурно-познава-тельного туризма, а также спелеотуризма, показанные на геоморфологической карте. В частности, охарактеризованы природные особенности Проне-Городища, Ижеславльского и Лубянского городищ, городища Пронское II (Гора Гневна), отработанного цементного карьера у поселка Змеинка, штолен на отрезке долины Прони от деревни Курлышево до поселка Октябрьский («Перспективная», «Козлиная»), Пронского водохранилища. Обобщена опубликованная информация об истории подземной добычи известняка в долине реки Прони, технологии его добычи, ценная для информирования рекреантов. Предложены маршруты экологических троп по территории Завидовского долинного комплекса с посещением старых подземных выработок известняка. Материалы настоящего исследования дополнены аэрофотоснимками и наземными фотографиями. The article treats tourist and recreational potential of the East-European Plain at the example of the Pronya River valley. The article provides a concise overview of research devoted to the investigation of the relief as a prerequisite for tourist and recreational attractiveness, recreational and geomorphological potential of the territory and recreational and geomorphological mapping. It investigates the possibilities of ecotourism development in nature reserves whose relief accounts for the geobotanical and landscape peculiarities of the territory, creating rare and unique landmarks. The article underlines that despite a high tourist and recreational potential of the Pronya river valley, tourists seldom visit the place. The article maintains that due to morphological characteristics and anthropogenic factors, the Pronya river valley is ideal for cultural tourism and ecotourism development. The article singles out areas with high ecotourism potential, cultural tourism potential, and cave tourism potential. The article describes natural characteristics of Pronya Hillfort, Izheslavl Hillfort, Lubyanka Hillfort, Pronsky II Hillfort (Gnevna Mountain), Zmeinka cement quarry, Kurlyshevo-Oktyabrsky mines (“Perspektivnaya” and “Kozlinaya”), Pronsk water reservoir. The article summarizes the information related to the history of limestone quarries in the Pronya river valley, which may be interesting for potential tourists. The article presents eco-travel itineraries including such destinations as Zavidovsky valley complex and limestone quarries. The article provides terrestrial photographs and aerial photographs.
34
Weninger, J. M., and J. H. McAndrews. "Late Holocene aggradation in the lower Humber River valley, Toronto, Ontario." Canadian Journal of Earth Sciences 26, no. 9 (September 1, 1989): 1842–49. http://dx.doi.org/10.1139/e89-157.
Full textAbstract:
Alluvial fills are common in the lower reaches of rivers along the western shore of Lake Ontario. The Humber River floodplain at Toronto is underlain by a 2.5 km long wedge of alluvium that thins upstream from Lake Ontario. Floodplain sediments were studied for their lithology, 14C age, and fossil pollen. On the levees, grey clay is overlain by oxidized silt and sand. Sediment cores from two flood ponds grade upward from gravel, sand, and silt, to silty marl, mineral peat, and clay, to heterogeneous silt and sand. Base-level (Lake Ontario) rise directly controlled aggradation between 6500 and 1800 years ago, after which time base level no longer directly controlled aggradation because levees had emerged alongside the channel and reduced the supply of sediment to the floodplain. For the past 150 years, upstream forest clearance and urbanization increased sediment input to the floodplain, broadened the levees, and filled the flood ponds.Average flood-pond aggradation rates were estimated from seven 14C dates; these rates declined from 65 cm/100 years between 6500 and 3800 years ago, to 47 cm/100 years between 3800 and 3400 years ago, to 26 cm/100 years between 3400 and 1800 years ago. These rates reflect contemporaneous lake-level rise. Between 1800 and 150 years ago, the average aggradation rate declined below the estimated rate of lake-level rise to 14 cm/100 years. Since then, the average aggradation rate has increased tenfold to 140 cm/100 years, surpassing the historic rate of lake-level rise of 23 cm/100 years. Fossil pollen from the flood ponds reflects local flood plain and regional upland vegetation during the past 4000 years.
35
Mohrlok, U. "Prediction of changes in groundwater dynamics caused by relocation of river embankments." Hydrology and Earth System Sciences 7, no. 1 (February 28, 2003): 67–74. http://dx.doi.org/10.5194/hess-7-67-2003.
Full textAbstract:
Abstract. Ecosystems in river valleys are affected mainly by the hydraulic conditions in wetlands including groundwater dynamics. The quantitative prediction of changes in groundwater dynamics caused by river embankment relocation requires numerical modelling using a physically-based approach. Groundwater recharge from the intermittently flooded river plains was determined by a leakage approach considering soil hydraulic properties. For the study area in the Elbe river valley north of Magdeburg, Germany, a calibrated groundwater flow model was established and the groundwater dynamics for the present situation as well as for the case of embankment relocation were simulated over a 14-year time period. Changes in groundwater depth derived from simulated groundwater levels occurred only during flood periods. By analysing the spatial distributions of changes in statistical parameters, those areas with significant impact on the ecosystems by embankment relocation can be determined. Keywords: groundwater dynamics,groundwater recharge, flood plains, soil hydraulic properties, numerical modelling, river embankment relocation
36
Rhoades, Chuck, Hlynur Oskarsson, Dan Binkley, and Bob Stottlemyer. "Alder (Alnus crispa) effects on soils in ecosystems of the Agashashok River valley, northwest Alaska." Écoscience 8, no. 1 (January 2001): 89–95. http://dx.doi.org/10.1080/11956860.2001.11682634.
Full text
37
Anderson, William, Michelle Negus Cleary, Jessie Birkett-Rees, Damjan Krsmanovic, and Nikoloz Tskvitinidze. "Gateway to the Yayla: The Varneti Archaeological Complex in the Southern Caucasus Highlands." European Journal of Archaeology 22, no. 1 (June 13, 2018): 22–43. http://dx.doi.org/10.1017/eaa.2018.26.
Full textAbstract:
Recent ground surveys in the Samtskhe-Javakheti region of southern Georgia have investigated a previously undocumented group of sites along a ridge overlooking the upper Kura river valley. Features and artefacts recorded at Varneti suggest long but episodic occupation from the Chalcolithic to the later medieval periods, with prominent phases in the Early to Middle Bronze Age and the Late Bronze Age to Early Iron Age. Varneti has the potential to contribute to understanding economic and strategic aspects of the long-term settlement pattern in the southern Caucasus, especially the interplay between lowland and highland zones. Its position in the landscape, at a transitional point between the river valley and the upland pasture (yayla), may explain its persistent use by agro-pastoral communities that operated in varied cultural situations. The survey results help us frame a series of questions regarding economic and social dynamics at a local and regional scale and the continuity and discontinuity of practice in highland environments through long timespans.
38
Koletić, Nikola, Antun Alegro, Anja Rimac, Nina Vuković, Vedran Šegota, and Tihana Vilović. "Environmental preferences of Polysiphonia subtilissima (Ceramiales, Rhodophyta) in transitional, oligohaline and fresh waters of the East Adriatic coast." Nova Hedwigia 111, no. 1 (August 1, 2020): 39–58. http://dx.doi.org/10.1127/nova_hedwigia/2020/0593.
Full textAbstract:
Polysiphonia subtilissima is originally a marine macroalga with a wide tolerance for salinity and therefore present on nearly all the coastlines of the planet. However, the transition of P. subtilissima toward freshwater ecosystems has been noticed worldwide, with numerous authors recording oligohaline and intertidal populations of notable size, although only three localities (Florida, Jamaica and Spain) with truly freshwater populations have been registered to date. This paper reports large populations of P. subtilissima in transitional, oligohaline and freshwater ecosystems of the Adriatic Sea Basin (Croatia, Southeast Europe). The alga was recorded in salinity ranging from 0.42 to 4.59 in the waters of the Neretva River Valley, and at 18.2 in transitional waters in the Zrmanja River. Along with P. subtilissima, the freshwater tropical red alga Compsopogon caeruleus has been recorded in the Neretva River Valley, being the first record of this species for Croatia and SE Europe. This particular combination of species has previously been recorded in freshwater localities only in Florida, Jamaica and Spain. Measured environmental parameters and species composition were analysed using canonical correspondence analysis and Gaussian response model, which showed that both species prefer waters with temperatures above 20 °C, high water conductivity, pH values above 7.5, and elevated water turbidity.
39
Czarnecka, Bożena. "Plant cover of the Szum river valley (Roztocze, South-East Poland)." Acta Societatis Botanicorum Poloniae 74, no. 1 (2011): 43–51. http://dx.doi.org/10.5586/asbp.2005.008.
Full textAbstract:
The break section of the Szum river and the mouth part of its left tributary, Miedzianka (Roztocze, SE Poland) were the object of the research conducted in the years 1999-2001. The aim of the study was to establish the abiotic conditions of the diversity of vegetation and the richness of vascular flora in a small lowland river valley. A real vegetation map was drawn in the scale 1:5000. The syntaxonomic classification of plant communities and habitat trophism were established on the basis of 120 phytosociological relevés and 160 soil samples, respectively. On the area of barely 35.4 ha identified were 48 plant associations and communities representing 11 phytosociological classes, among them habitats protected in Poland (16 types) and important at the EU scale (3). There were found 378 species of 72 families, including: 21 species under strict protection, 9 under partial protection, 25 plants threatened on the regional scale, and 2 included into the Polish Red Data Book. Most of interesting species and non-forest communities occur in the parts of the valley above and below a landscape reserve 'Szum', established in 1958, covering presently 18.17 ha. The greatest floral richness was found in the peatbog-meadow complexes (<em>Phragmitetea</em>, <em>Molinio-Arrhenatheretea</em>, <em>Scheuchzerio-Caricetea</em>), in bog-alder forests and willow bushes (<em>Alnetea glutinosae</em>), and streamline ash-alder carrs (<em>Querco-Fagetea</em>, <em>Alno-Ulmion</em>), while the smallest - in the pine and poorer upland mixed fir forests (<em>Vaccinio-Piceetea</em>). Vascular flora appears to be the richest in the sections of the valley where the bottom is overgrown by non-forest communities. The results of the study indicate that it is necessary to enlarge the area of the existing nature reserve.
40
Błońska, Agnieszka, Dariusz Halabowski, and Agnieszka Sowa. "Population structure of Liparis loeselii (L.) Rich. in relation to habitat conditions in the Warta River valley (Poland)." Biodiversity Research and Conservation 43, no. 1 (September 1, 2016): 41–52. http://dx.doi.org/10.1515/biorc-2016-0016.
Full textAbstract:
Abstract The paper presents results of a study on the population structure of the orchid Liparis loeselii growing in the Warta River valley peat bog in Myszków (Woźnicko-Wieluńska Upland, S. Poland). Individuals of L. loeselii occurred in patches of Menyantho trifoliatae-Sphagnetum teretis and Eleocharitetum pauciflorae – associations. The demographic structure of L. loeselii populations was described by variations in plant height, the length and width of leaves and the number of flowers of the constituting individuals. It was observed that habitat conditions such as conductivity, pH and the percentage cover of tall perennials had the strongest effect on the structure of L. loeselii populations.
41
Muhs, Daniel R., Jeffrey S. Pigati, James R. Budahn, Gary L. Skipp, E. Arthur Bettis, and Britta Jensen. "Origin of last-glacial loess in the western Yukon-Tanana Upland, central Alaska, USA." Quaternary Research 89, no. 3 (April 10, 2018): 797–819. http://dx.doi.org/10.1017/qua.2018.11.
Full textAbstract:
AbstractLoess is widespread over Alaska, and its accumulation has traditionally been associated with glacial periods. Surprisingly, loess deposits securely dated to the last glacial period are rare in Alaska, and paleowind reconstructions for this time period are limited to inferences from dune orientations. We report a rare occurrence of loess deposits dating to the last glacial period, ~19 ka to ~12 ka, in the Yukon-Tanana Upland. Loess in this area is very coarse grained (abundant coarse silt), with decreases in particle size moving south of the Yukon River, implying that the drainage basin of this river was the main source. Geochemical data show, however, that the Tanana River valley to the south is also a likely distal source. The occurrence of last-glacial loess with sources to both the south and north is explained by both regional, synoptic-scale winds from the northeast and opposing katabatic winds that could have developed from expanded glaciers in both the Brooks Range to the north and the Alaska Range to the south. Based on a comparison with recent climate modeling for the last glacial period, seasonality of dust transport may also have played a role in bringing about contributions from both northern and southern sources.
42
Flores-Mangual, Mario L., Birl Lowery, and James G. Bockheim. "Episodic Rainwater Movement in a Hydrophobic Sparta Sand under Three Ecosystems in Lower Wisconsin River Valley." Soil Science Society of America Journal 80, no. 6 (November 2016): 1443–62. http://dx.doi.org/10.2136/sssaj2016.04.0115.
Full text
43
Bellmore, J. R., and C. V. Baxter. "EFFECTS OF GEOMORPHIC PROCESS DOMAINS ON RIVER ECOSYSTEMS: A COMPARISON OF FLOODPLAIN AND CONFINED VALLEY SEGMENTS." River Research and Applications 30, no. 5 (May 20, 2013): 617–30. http://dx.doi.org/10.1002/rra.2672.
Full text
44
Khomiak, I., M. Zarichna, N. Demchuk, V. Kostiuk, O. Vasylenko, R. Vlasenko, and D. Harbar. "Influence of flow regulation on the dynamics of ecosystems of the Lisna river valley (Zhytomyr region)." Ecological Sciences 35, no. 2 (2021): 45–48. http://dx.doi.org/10.32846/2306-9716/2021.eco.2-35.7.
Full text
45
Alexandrowicz, Witold Paweł. "Mollusc assemblages from Subatlantic oxbow lake deposits in the Szreniawa River valley near Słomniki (Miechów Upland, southern Poland)." Folia Malacologica 26, no. 4 (December 11, 2018): 249–62. http://dx.doi.org/10.12657/folmal.026.026.
Full text
46
Todd, Victoria Louise Georgia, and Dean Andrew Waters. "Small Scale Habitat Preferences of Myotis daubentonii, Pipistrellus pipistrellus, and Potential Aerial Prey in an Upland River Valley." Acta Chiropterologica 19, no. 2 (December 2017): 255–72. http://dx.doi.org/10.3161/15081109acc2017.19.2.004.
Full text
47
Paluszkiewicz, Renata. "The Developmental Stages of An Accumulative Cone of Dry Valley as an Indication of Change in Natural Environment Conditions (Western Pomerania)." Quaestiones Geographicae 32, no. 1 (March 1, 2013): 15–20. http://dx.doi.org/10.2478/quageo-2013-0002.
Full textAbstract:
Abstract The aim of this paper is to present the stages of development of an alluvial cone as an indication of change in natural environment conditions. a detailed research was conducted within the upland regions of Drawsko Lakeland. At the valley mouth of one of the erosional-denudational valleys an alluvial cone in question splays out. The imparity between the capacity of the erosional-denudational valley and the capacity of the alluvial cone indicates that the main stage of erosion had taken place before the cone’s deposition. During the beginning stage the material acquired from the dissection was most likely delivered directly to the channel of Dębnica river and was incorporated in the fluvial transport. The cone was formed during the later stage. The results of the radiocarbon analyses reveal that the formation of the alluvial cone and the valley associated with the cone took place during the Subatlantic. It was also estimated that the cone aggraded with the rate of approximately 3,9 mm per year
48
Rojas Briceño, Nilton B., Elgar Barboza Castillo, Oscar Andrés Gamarra Torres, Manuel Oliva, Damaris Leiva Tafur, Miguel Ángel Barrena Gurbillón, Fernando Corroto, Rolando Salas López, and Jesús Rascón. "Morphometric Prioritization, Fluvial Classification, and Hydrogeomorphological Quality in High Andean Livestock Micro-Watersheds in Northern Peru." ISPRS International Journal of Geo-Information 9, no. 5 (May 7, 2020): 305. http://dx.doi.org/10.3390/ijgi9050305.
Full textAbstract:
Anthropic activity affects the hydrogeomorphological quality of fluvial systems. River and valley classifications are fundamental preliminary steps in determining their ecological status, and their prioritization is essential for the proper planning and management of soil and water resources. Given the importance of the High Andean livestock micro-watershed (HAL-MWs) ecosystems in Peru, an integrated methodological framework is presented for morphometric prioritization that uses a Principal Component Analysis (PCA) and Weighted Sum Approach (WSA), geomorphological fluvial classifications (channel, slope, and valley), and hydrogeomorphological evaluations using the Hydrogeomorphological Index (IHG). Of six HAL-MWs studied in Leimebamba and Molinopampa (Amazonas region), the PCWSA hybrid model identified the San Antonio HAL-MW as a top priority, needing the rapid adoption of appropriate conservation practices. Thirty-nine types of river course were identified, by combining 13 types of valley and 11 types of riverbed. The total assessment of the IHG indicated that 7.6% (21.8 km), 14.5% (41.6 km), 27.9% (80.0 km), and 50.0% (143.2 km) of the basin lengths have “Poor”, “Moderate”, “Good”, and “Very good” quality rankings, respectively. The increase in the artificial use of river channels and flood plains is closely linked to the decrease in hydrogeomorphological quality.
49
Baranovsky, B. A., I. A. Ivanko, A. V. Kotovych, L. A. Karmyzova, and N. O. Roschina. "Analysis of trophic structure of forest flora in the Oril River valley." Fundamental and Applied Soil Science 18, no. 3-4 (December 12, 2017): 37–50. http://dx.doi.org/10.15421/041714.
Full textAbstract:
Biodiversity is important for maintaining of forest ecosystems functioning and in their resistance to anthropo-climatic challenges. Assessment of species diversity and species ecomorphic analysis is the basis for determining their current status, rational use and protection. At the end of the nineteenth century, Belgard A. L. (1950) in his system of ectomorphs using terminology presented by Dekandol (1956) and Warming (1903), had proposed a «trophomorph» category that reflected species relation to soil richness. Analysis of trophomorphs reflects diversity of soil conditions in different biotopes within forest ecosystems. The article gives an analysis on vascular plant trophomorphs distribution in various forest biotopes of Oril river valley. Flora and vegetation surveys in forests of Oril river valley were carried out by A. L. Belgard and T. F. Kirichenko since the 30s of the 20th century. The latest data on forest vegetation state within the Oril river valley were given in the works of Y. Gamulja and V. Manyuk. Generalized bioecological analysis of flora Oril river valley was represented in the monograph of B. Baranovsky, V. Maniuk, I. Ivanko, L. Karmyzova «Flora analysis of the Oril National Park». As is known, edaphic conditions of plant habitats in a first place are determined by soil fertility depending on the plant nutrients availability. Soddy-forest soil on sandy terrace of Oril river valley has a relatively low content of humus and total nitrogen: 2 and 0.04 %. Under these conditions, pine phytocenoses were ocсurred that represented exclusively by artificial plantings. Soils in the depressed area of Oril river floodplain are much richer in humus and nitrogen content (10 and 0.37 %). Here, arboreal and shrubby vegetation is represented by communities with common oak. On the second terrace of Oril river valley, forest vegetation is represented by artificial pine forests. Microcenoses with black locust, amorpha and willow occurred on elevated areas of sandy terrace (arena). In the depressed area of the arena, microcenoses with aspen and birch, aspen, Tatarian maple, amorpha, black locust were occurred additionally to pine communities. In the Oril floodplain, native arboreal and shrubby vegetation is represented mainly by communities with common oak. In depressed areas of the floodplain, microcenoses with white poplar, black poplar, aspen, Tatarian maple, amorpha, willow (Salix alba, S. fragilis), osiery (Salix cinerea, S. triandra), and alder are fragmentarily occurred. In conditions of elevated areas of the floodplain, 196 vascular plants species were found, and 105 species in depressed areas. On the second terrace, 38 plant species grow on the elevated areas, and 54 species on the depressed ones. Flora includes 45 adventive plant species. In depressed floodplain areas, oligotrophs are represented by 7 species, mesotrophs by 126 species, megatrophs by 50 species, and in elevated areas: 7, 126 and 25 species, respectively. In depressed areas of arena oligotrophs are represented by 4 species, mesotrophs by 29 species, and megatrophs by 11, elevated areas: 7 and 21 species respectively, and megatrophs were absent.
50
Behrman, Caroline, Roy Van Arsdale, Youngsang Kwon, Kerry Stockslager, Dave Leverett, and David Lumsden. "Drone Geologic Mapping of an Active Sand and Gravel Quarry, Desoto County, Mississippi." Drones 3, no. 3 (July 15, 2019): 57. http://dx.doi.org/10.3390/drones3030057.
Full textAbstract:
Aerial drone photography of an active pit within a sand and gravel quarry in DeSoto County, Mississippi, was conducted to better understand the Upland Complex, which is a high-level Pliocene terrace of the Mississippi River. The Upland Complex is of great interest economically, as it is the primary source of sand and gravel for Memphis, Tennessee and the surrounding region. The pit dimensions were approximately 820 ft (250 m) by 655 ft (200 m) and 79-ft (24 m) deep upon completion of the mining. Eight 3-D models of the pit were made at different times to illustrate the mining progression. Oblique and horizontal stereo aerial photography of the highwalls was conducted to produce 3-D models and high-resolution photomosaics of the highwalls for geologic mapping and interpretation. The mapped highwall geology included Pliocene Mississippi River bars consisting of sand, sand and gravel, and gravel ranging in thickness from 2 ft (0.6 m) to 32.8 ft (10 m), with variable cross-bed dip directions suggesting a meandering river environment of deposition. Pleistocene loess overlies the Pliocene sediment. The highwalls also revealed northerly-striking late Pliocene or Pleistocene tectonic folding, faulting, and probable earthquake liquefaction in northwestern Mississippi, where no Pliocene or Quaternary tectonic deformation had previously been reported. This study demonstrated Drone aerial photography as a quick, low cost, and safe means to study poorly accessible open-pit mining and to help understand the geology of the lower Mississippi River Valley.