Relevant bibliographies by topics / Xeric

Academic literature on the topic 'Xeric'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Xeric"

1

Eslami, S. V. "Comparative Germination and Emergence Ecology of Two Populations of Common Lambsquarters (Chenopodium album) from Iran and Denmark." Weed Science 59, no. 1 (March 2011): 90–97. http://dx.doi.org/10.1614/ws-d-10-00059.1.

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Common lambsquarters, a summer annual weed, has occupied comparatively different ecogeographical regions around the globe. To investigate the extent to which germination and emergence traits have differentiated in two natural populations of common lambsquarters from different environments (Denmark as mesic and Iran as xeric population), experiments were conducted in the laboratory. Germination of both populations was stimulated by light. The greatest germination percentage of xeric and mesic populations occurred at 25/15 and 20/10 C, respectively. The xeric population showed significantly greater germinability at the lowest (15/5 C) and the highest (35/25 C) fluctuating temperature regimes. Germination of the xeric population was only slightly affected, and the mesic population was severely retarded at a salinity level of 20 desi siemens (DS) m−1. Greater than 42% of the xeric seeds germinated at 30 dS m−1salinity, while the mesic germination almost ceased at this salinity level. Germination of seeds placed in distilled water after the 14-d salinity exposure treatments (recovery rates) was also greater for the xeric vs. mesic populations. Xeric populations showed more than 65% germination up to the osmotic potential of −0.4 MPa, while decreasing osmotic potential from 0 to −0.4 MPa caused an 80% reduction in mesic population germinability (9% germination). The greatest emergence of xeric (77%) and mesic (70%) populations occurred for seeds placed on the soil surface and no seedlings emerged from burial depth 3 cm. These study results suggest that common lambsquarters populations have differentiated for heat, salinity, and drought tolerance at germination stage. These contrasting germination patterns are appeared to be due to either adaptation via natural selection or maternal effects, or some combination of both. Though this study has certain limitations, it, through its findings and their propositions, adds to the existing knowledge about interpopulation differences in germination requirements of common lambsquarters, as a globally distributed species.
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Kubiske, Mark E., and Marc D. Abrams. "Photosynthesis, water relations, and leaf morphology of xeric versus mesic Quercusrubra ecotypes in central Pennsylvania in relation to moisture stress." Canadian Journal of Forest Research 22, no. 9 (September 1, 1992): 1402–7. http://dx.doi.org/10.1139/x92-186.

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Differences in photosynthesis and water relations during drought, and in leaf morphology, were evaluated in 1-year-old greenhouse-grown Quercusrubra L. seedlings from neighboring mesic and xeric sites in central Pennsylvania, U.S.A. Xeric seedlings had higher photosynthetic rates and stomatal conductance to water vapor than mesic seedlings during well-watered conditions. During a drought cycle, xeric seedlings maintained positive net photosynthesis at significantly lower predawn leaf water potential and relative water content. Mesic seedlings exhibited greater intrasource variation in gas exchange during drought, which may be related to reduced selection pressure for drought tolerance characteristics on the mesic site or to gene flow from the adjacent, upslope xeric site. Nonstomatal limitations to photosynthesis increased during drought and accounted for 98% of the reduction in photosynthesis as both sources approached incipient wilting. Xeric seedlings exhibited less nonstomatal inhibition of photosynthesis during early and midstages of drought, suggesting a greater tolerance of the photosynthetic apparatus for tissue water deficit. Xeric seedlings also exhibited the expected leaf morphological characteristics, which included smaller leaf area and greater leaf thickness and specific leaf mass. These results indicate that Q. rubra growing on adjacent sites in central Pennsylvania exhibit ecotypic differences in ecophysiology that are consistent with site moisture conditions.
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Caraco, N. F., N. F. Caraco, J. J. Cole, and J. J. Cole. "Human influence on nitrogen export: a comparison of mesic and xeric catchments." Marine and Freshwater Research 52, no. 1 (2001): 119. http://dx.doi.org/10.1071/mf00083.

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Human impact on export of nitrogen in rivers is of great concern because increases in nitrogen export can dramatically increase primary productivity and decrease water quality in the coastal zone. Most research on this has been done for mesic catchments and not the xeric catchments that cover a large fraction of the earth’s surface. This paper uses river data to compare whole-catchment nitrogen export from xeric and mesic areas and human impact on this export. Results suggest that although nitrogen export is lower from xeric catchments than from mesic catchments, human impact on export and forms of nitrogen being exported may be similar. In both xeric and mesic catchments with low population density (<20 humans km–2) the export of nitrate averages only 30%of export from catchments with populations ≥20 humans km–2. For organic N export there is little effect of human population in either xeric or mesic catchments. Thus, for both xeric and mesic catchments human activity is associated with a shift in dominant form of N being exported. On average, organic N is the dominant form of nitrogen being exported at low human population densities, whereas inorganic N export tends to dominate at higher population densities.
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Comeau, Philip G., and James P. Kimmins. "Above- and below-ground biomass and production of lodgepole pine on sites with differing soil moisture regimes." Canadian Journal of Forest Research 19, no. 4 (April 1, 1989): 447–54. http://dx.doi.org/10.1139/x89-070.

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The distribution of tree biomass and the allocation of production was measured in four stands of lodgepole pine (Pinuscontorta var. latifolia Engelm.), two growing on sites with xeric soil moisture regimes and two on sites with mesic soil moisture regimes. At the time of sampling the stands were 70–78 years old. Aboveground biomass ranged from 116.5 Mg•ha−1 on one xeric site to 313.1 Mg•ha−1 on one mesic site. Stem biomass represented 68 and 73% of total tree biomass on the xeric and mesic sites, respectively. Total root biomass represented between 20 and 28% of total lodgepole pine biomass. Fine and small roots (<5 mm diameter) represented 4 and 1.5% of total tree biomass on the xeric and mesic sites, respectively. Total net primary production ranged from 7.9 Mg•ha−1•year−1 on the xeric sites to 11.9 Mg•ha−1•year−1 on the mesic sites. Stemwood production represented 20 and 27% of total net primary production on the xeric sites and 35% on both mesic sites. Belowground production represented 38 and 46% of total net primary production on the two mesic sites (4.5 and 5.5 Mg•ha−1•year−1, respectively) and 55 and 66% on the two xeric sites (4.3 and 6.3 Mg•ha−1•year−1, respectively). Fine and small roots represented 82–94% of belowground production. Production allocation was in the following order: fine and small roots > stems > foliage > coarse roots > branches, for all but the wettest site, where stem production exceeded fine and small root production.
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Tworkoski, T. J., M. S. Ross, and G. M. Hopper. "Analysis of chestnut and scarlet oak stump sprout growth." Canadian Journal of Forest Research 20, no. 1 (January 1, 1990): 112–16. http://dx.doi.org/10.1139/x90-016.

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This paper describes stem unit development of chestnut (Quercusprinus L.) and scarlet oak (Q. coccinea Muenchh.) stump sprouts growing on mesic and xeric sites in the Ridge and Valley physiographic region of southwest Virginia. On xeric sites, scarlet oak sprouts produced longer stem units than chestnut oak sprouts, whereas chestnut oak produced more flushes than scarlet oak. However, seasonal height growth was the same for both species. On xeric sites, 39% of the chestnut oaks flushed at least three times compared with 9% on the xeric site. Stem unit length among flushes of chestnut oak was similar, regardless of site. In oaks, stem unit analysis can be useful for evaluating growth components that may affect regenerative success and subsequent stand yield.
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Oswald, Scott W., and Doug P. Aubrey. "Xeric Tree Populations Exhibit Delayed Summer Depletion of Root Starch Relative to Mesic Counterparts." Forests 11, no. 10 (September 23, 2020): 1026. http://dx.doi.org/10.3390/f11101026.

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Research linking soil moisture availability to nonstructural carbohydrate (NSC) storage suggests greater NSC reserves promote survival under acute water stress, but little is known about how NSC allocation responds to long-term differences in water availabilty. We hypothesized populations experiencing chronic or frequent water stress shift carbon allocation to build greater NSC reserves for increased survival probability during drought relative to populations rarely experiencing water stress. Over a year, we measured soluble sugar and starch concentrations from branches, stems, and coarse roots of mature Pinus palustris trees at two sites differing in long-term soil moisture availability. Xeric and mesic populations exhibited a cycle of summer depletion-winter accumulation in root starch. Xeric populations reached a maximum root starch concentration approximately 1–2 months later than mesic populations, indicating delayed summer depletion. Xeric and mesic populations reached the same minimum root starch at similar times, suggesting extended winter accumulation for xeric populations. These results suggest seasonal mobilization from root starch is compressed into a shorter interval for xeric populations instead of consistently greater reserves as hypothesized. Seasonal trends differed little between xeric and mesic populations for starch and sugars, suggesting the importance of roots in seasonal carbon dynamics and the primacy of starch for storage. If roots are the primary organ for longterm storage, then our results suggest that whole-plant mobilization and allocation respond to chronic differences in water availability.
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Canadell, Josep, and Ferran Rodà. "Root biomass of Quercusilex in a montane Mediterranean forest." Canadian Journal of Forest Research 21, no. 12 (December 1, 1991): 1771–78. http://dx.doi.org/10.1139/x91-245.

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Biomass allocation to roots was studied in holm oak (Quercusilex L.), a dominant evergreen tree in broad-leaved sclerophyllous Mediterranean forests. The root systems of 32 single-stemmed holm oaks growing in shallow soils on largely unfissured bedrock were excavated in a mesic site and a xeric site in the Montseny Mountains (northeast Spain). Individual root:shoot biomass ratios (roots with diameter <1 cm not included) of single-stemmed trees were significantly higher in the xeric site (mean 0.45) than in the mesic site (mean 0.37), probably reflecting the lower water availability and higher light availability in the xeric site. It is concluded that single-stemmed holm oaks have higher root:shoot ratios than most temperate forest trees, particularly so when growing on a xeric site. Root:shoot ratios of single-stemmed trees were not linearly correlated with dbh. Allometric regressions of root biomass on dbh did significantly differ between sites. Roots <1 cm in diameter were sampled with soil cores in the mesic site. Holm oaks ≥5 cm dbh in a stand dominated by single-stemmed trees on the mesic site had an aboveground biomass of 160 t/ha and a belowground biomass of 63 t/ha. The belowground biomass was composed of 30 t/ha of root crowns plus roots >5 cm in diameter, 17 t/ha of roots 1–5 cm in diameter, and 16 t/ha of roots <1 cm in diameter. The xeric stand was dominated by multistemmed holm oaks with massive root crowns developed after repeated coppicing. Three multistemmed trees were excavated, yielding a mean root:shoot ratio of 1.2. Through resprouting from root crowns, managed or disturbed holm oak forests can accumulate a belowground biomass greater than that displayed aboveground: 91 t/ha (excluding roots <1 cm in diameter) and 79 t/ha, respectively, in our xeric stand.
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Dengler, Jürgen, Stefan Widmer, Eline Staubli, Manuel Babbi, Jamyra Gehler, Daniel Hepenstrick, Ariel Bergamini, et al. "Dry grasslands of the central valleys of the Alps from a European perspective: the example of Ausserberg (Valais, Switzerland)." Hacquetia 18, no. 2 (December 1, 2019): 155–77. http://dx.doi.org/10.2478/hacq-2019-0008.

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Abstract The upper Rhone valley in the Swiss canton of Valais is one of the driest and most continental of the inner-alpine valleys and harbours a rich xerothermic flora. We studied syntaxonomy and ecology of dry grasslands and their species richness patterns. In 2018 we recorded 28 vegetation plots (10 m2) and three nested-plot series of 0.0001 to 100 m2 on the south-facing slopes above the village of Ausserberg. Mean richness of all species ranged from 1.7 on 1 cm2 to 47.3 on 100 m2, with little contribution of bryophytes and lichens. The species-area relationship for total richness closely followed a power function. Modified TWINSPAN yielded a three-cluster solution, which could easily be matched with three orders of the class Festuco-Brometea: Stipo pulcherrimae-Festucetalia pallentis (xeric, rocky), Festucetalia valesiacae (xeric, non-rocky) and Brachypodietalia pinnati (meso-xeric). The subdivision of the xeric types into two orders is new for Swiss dry grasslands, where these types up to now had been joined in a single alliance Stipo-Poion within the Festucetalia valesiacae.
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Martin, Chris A., and Jean C. Stutz. "Growth of Sour Orange in Response to Mesic or Xeric Geographic Isolates of Glomus intraradices under Two Irrigation Frequency Regimens." HortScience 31, no. 4 (August 1996): 664c—664. http://dx.doi.org/10.21273/hortsci.31.4.664c.

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Sour orange (Citrus aurannum L.) seedlings were inoculated with geographic isolates of an endomycorrhizal fungus, Glomus intraradices Smith and Schneck, from a xeric (New Mexico) or mesic (Florida) climate or not inoculated as controls, and were grown for 5 months under high (soil water potential more than or equal to –0.1 MPa, irrigated once every 3 days) or low (more than or equal to –1.0 MPa, irrigated once every 12 to 15 days) irrigation frequency regimens. Similar leaf P concentrations were achieved in all plants by giving more P fertilizer to nonmycorrhizal plants than mycorrhizal plants. Plants inoculated with the xeric isolate had more arbuscules and fewer vesicles than those inoculated with the mesic isolate. Mycorrhizal fungi had little affect on plant growth under high irrigation frequency. Low irrigation frequency reduced plant growth compared with high irrigation frequency. Under low irrigation frequency, shoot and root growth increased for mycorrhizal plants; however, the magnitude of increase of shoot growth was greatest for plants inoculated with the xeric isolate. Additionally, low irrigation frequency was associated with a dramatic decrease in vesicle formation in roots inoculated with the mesic isolate. This study showed that sour orange plants especially benefited from inoculation with an isolate from a xeric climate under low irrigation frequency, independent of P nutrition.
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Heinemann, Karin, Thomas Kitzberger, and Thomas T. Veblen. "Influences of gap microheterogeneity on the regeneration of Nothofagus pumilio in a xeric old-growth forest of northwestern Patagonia, Argentina." Canadian Journal of Forest Research 30, no. 1 (February 1, 2000): 25–31. http://dx.doi.org/10.1139/x99-181.

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We experimentally examined the influences of within-gap environmental heterogeneity on regeneration patterns of Nothofagus pumilio (Poepp. & Endl.) Krasser near the xeric limit of its distribution in northern Patagonia, Argentina. Results from this xeric old-growth forest are compared with patterns previously described for the same species in mesic forests. Survival of N. pumilio seedlings beneath tree-fall gaps in this relatively xeric forest appears to be strongly influenced by moisture availability. Seedlings and saplings that have survived this demographic bottleneck are found at microsites where soil water potentials are higher, such as in the shady northern edges of tree-fall gaps (Ψ = -0.46 MPa compared with less than -0.6 MPa in other gap positions) and on coarse woody debris (Ψ = -0.29 MPa, compared with -0.51 MPa on the forest floor). Although gap creation in this dry N. pumilio forest is favorable to tree regeneration by releasing light resources, decreased water resources may switch the system from a light- to a water-limited system in some positions of the gap. This may explain the lack of regeneration of N. pumilio often observed after creation of large gaps towards the xeric end of its range and needs to be considered in the management of this important timber species.
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Dissertations / Theses on the topic "Xeric"

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Lawless, Patrick Joseph. "XERIC LIMESTONE PRAIRIES OF EASTERN UNITED STATES." View online, 2005. http://lib.uky.edu/ETD/ukybiol2005d00321/Lawless.pdf.

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Dayton, Gage Hart. "Community assembly of xeric-adapted anurans at multiple spatial scales." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3296.

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The distribution and abundance of organisms is influenced by historical, abiotic, and biotic factors. The goal of my dissertation was to determine the distribution of anurans in the Big Bend region of the Chihuahuan Desert and to examine how abiotic and biotic factors shape the composition and structure of anuran communities at multiple spatial scales. My approach relied on extensive field surveys, laboratory and field experiments, and GIS modeling. Results from field surveys and reciprocal transplant studies of tadpoles indicate that abiotic conditions of the breeding site most likely do not play a significant role in causing the segregation of species among individual breeding pools. I used laboratory and mesocosm experiments to test for indirect and direct effects of predators on growth and survival of S. couchii tadpoles. I found that S. couchii tadpoles do not alter their behavior in the presence of predators and are very susceptible to predation. Although tadpoles reared with predators suffered high mortality rates, they metamorphosed significantly faster than tadpoles reared without predators. The reduced time to metamorphose is likely a result of the thinning of intraspecific competitors. Because the primary cause of death for S. couchii tadpoles is desiccation due to pond drying, predators may play an important role in facilitating metamorphosis by decreasing competitors and thus increasing per capita resources, therefore decreasing time to metamorphosis for the surviving tadpoles. At the landscape level anuran distributions seem to be influenced by environmental factors that influence the survival of the adult stage. At the level of the breeding site, microhabitat and abiotic components of the aquatic environment do not seem to play an important role in influencing breeding site use by different species. Rather, it seems likely that predation on tadpoles by predators is important in limiting the distribution of some species and that the fast-developing S. couchii may exclude other species from using sites via oophagy and predation on small tadpoles. My research elucidates the fact that in order to understand factors important in regulating ecological communities it is important to examine both abiotic and biotic factors at multiple spatial scales.
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Knott, Edward Joseph. "The effect of elephants (Loxodonta africana, Blumenbach, 1797) on Xeric Succulent Thicket." Thesis, Rhodes University, 2007. http://hdl.handle.net/10962/d1005359.

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This study looks at the impact of elephant feeding on the Xeric Succulent Thicket component of Eastern Cape Subtropical Thicket (ECST) in Addo Elephant National Park (AENP). Observations of elephant feeding were carried out and vegetation transects were surveyed for impact of elephant feeding. The results indicated that the Nyati elephants spent the majority of their time grazing (nearly 90%), particularly the cow-young herds, and especially when the herd gathered in larger numbers. Browsing events were concentrated on Acacia karroo (81%) and there was no significant difference between the sexes in their preference for this species. Despite being subjected to most of the browsing, the majority of A. karroo trees were undamaged and the effect of elephants was generally light. It appears unlikely that, three years after re-introduction to Nyati, the elephants have had an effect on community structure of the vegetation. Surveys were conducted on stands of the alien invasive weed prickly pear Opuntia ficus-indica, and it was recorded that elephants in Nyati have had a dramatic effect on prickly pear, utilising all adult plants assessed and destroying 70% of them. This level of destruction in such a short period of time suggests that prickly pear is a highly favoured species. The results from the present study suggest that elephants can play a role in the control of prickly pear. Results are discussed in terms of elephants as both megaherbivores and keystone species, and as agents of intermediate disturbance.
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Fabricius, Christo 1956. "The impact of land use on biodiversity in xeric succulent thicket, South Africa." Doctoral thesis, University of Cape Town, 1997. http://hdl.handle.net/11427/9512.

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Bibliography: leaves 100-114.
Human-induced land management practices are key factors which influence the dynamics of landscapes, land elements and biotic communities in Xeric Succulent Thicket, a notoriously fragile and low resilience ecosystem in the Eastern Cape, South Africa. In its natural state this vegetation type is characterized by a continuous mosaic of clumps of diverse woody shrubs in a matrix of grass, hardy dwarf shrubs and bare ground. When indigenous herbivores are replaced by domestic livestock at unsustainable stocking rates, the ratio of clump to interclump areas decreases. This has impacts on biodiversity at the landscape level, and affects the composition and species richness of plant, arthropod and reptile communities and fungal symbionts. The study has two main objectives: 1) to detennine the local-level effects of different types of land use on biodiversity in Xeric Succulent Thicket; and 2) to better understand the factors which affect biodiversity in different taxonomic groups and at different spatial scales, so that the preservation function of protected areas could be enhanced. The key questions which are addressed in the thesis are what does 'biodiversity' mean, and what are its different dimensions in Xeric Succulent Thicket; what roles do protected areas and other lands play in preserving biodiversity, how are different taxonomic groups affected by different types of land use; and how can biodiversity be monitored and measured? . The regional 'conservation landscape' is seen as the protected area plus the land immediately adjoining it, and is viewed as an integrated mosaic of anthropogenic landscapes (land management units), land elements (patches within landscapes). producer communities (assemblages of interacting plant species), consumer communities (assemblages of interacting herbivores and predators) and soil microorganisms. From a process point of view, the research relates the intensity of disturbance, mainly as a result of herbivory, to landscape complexity, the structure of land elements, and the species richness of producers and consumers within land elements. The patterns which emerge are interpreted in the context of ecosystem functioning, from the point of view of a practicing conservation biologist.
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Wenk, Evelyn Susannah. "Effects of vegetation structure on fire behavior and wiregrass seedling establishment in xeric sandhills." Connect to this title online, 2009. http://etd.lib.clemson.edu/documents/1252423837/.

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Hoppert, Michael, Rudolph Reimer, Anne Kemmling, Annekatrin Schröder, Bettina Günzl, and Thilo Heinken. "Structure and reactivity of a biological soil crust from a xeric sandy soil in Central Europe." Universität Potsdam, 2004. http://opus.kobv.de/ubp/volltexte/2005/587/.

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The investigation was designed to explore the structure, composition and activity of a biological soil crust on an acidic, sandy soil from a temperate climate. The crust covers several hundreds of square meters on the hilltop of a large terminal moraine. The conjugate alga Zygogonium ericetorum forms the essential matrix for the crust, a dense web of algal filaments with interspersed lichens and mosses. The crust is composed of three layers, with an uppermost layer consisting nearly entirely of a dense algal mat. In lower layers, a parasitic fungus, penetrating the algal cells, is another important component of the crust community. In this soil crust, photosynthetic and respiratory activity is stabilized at low water activities.
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Legras, Elaine C. "Microhabitat is critical for sugar pine seedlings emergence and survival in a xeric Jeffrey pine dominated forest /." abstract and full text PDF (UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1455660.

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Thesis (M.S.)--University of Nevada, Reno, 2008.
"May, 2008." Includes bibliographical references (leaves 39-44). Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2009]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.
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Seymour, Colleen. "The influence of size and density of the Camelthorn (Acacia erioloba Meyer) on its keystone role in the Xeric Kalahari." Doctoral thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/12408.

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Includes bibliographical references.
Within the savannas of the southern Kalahari, land use practices can change habitat structure profoundly, so that rangelands either became densely wooden through bush thickening or are cleared completely using arboricides or manual tree felling and bush clearance, or are at some stage in between. Demands for the wood of camelthorn trees (Acacia reioloba), (the largest tree species growing on semi-arid and arid Kalahari sands) for firewood has also impacted habitat structure. Large trees are important in the Kalahari ecosystem because they provide shade, nesting and foraging sites for birds and mammals, as well as microhabitats that facilitate the existence of a suite of subcanopy plants. Indeed, large A. erioloba tress have been mooted as a context-depend keystones species, important to other biota and ecological prcesess. The primary aim of this study was to investigate the importance of A. erioloba to biodiversity, focusing on plants and birds.
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Seine, Rüdiger. "Vegetation von Inselbergen in Zimbabwe : Struktur, Diversität und ökogeographische Differenzierung einer tropischen Lebensgemeinschaft /." Wiehl : M. Galunder-Verlag, 1996. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=008418634&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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Beiler, Kevin Jon. "The complex socio-spatial architecture of Rhizopogon spp. mycorrhizal networks in xeric and mesic old-growth interior Douglas-fir forest plots." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/40000.

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Mycorrhizal networks (MNs) can influence tree establishment and resource competition but little is known regarding their underlying architecture in situ. This study examined the socio-spatial architecture of MNs between Rhizopogon spp. genets and interior Douglas-fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco) trees in an old-growth forest. MN features were contrasted between plots with xeric versus mesic soil moisture regimes as a proxy for changes in site water stress anticipated with climate change. My objectives were to: (1) describe the fine-scale spatial patterns and autecological traits of R. vesiculosus and R. vinicolor mycelia systems and compare these between xeric and mesic plots; (2) describe the spatial patterns and architecture of Rhizopogon spp. MNs at the forest stand scale; (3) contrast MN architectures between phytocentric and mycocentric perspectives and between xeric and mesic plots, and identify critical determinants of MN architectures. Rhizopogon vesiculosus mycelia occurred deeper, were more spatially prolific, and colonized more tree roots than R. vinicolor mycelia. Both species were associated with moist microsites within plots, and had more prolific mycelia in mesic compared to xeric plots. The occurrence of R. vesiculosus shifted in the presence of R. vinicolor towards deeper soil horizons, suggesting competition and foraging strategy are important for niche partitioning between these species. At the forest stand scale, Rhizopogon spp. genets spanned tens of metres and colonized up to 19 trees, but R. vesiculosus genets were larger and linked more trees than R. vinicolor genets. Multiple tree cohorts were linked, with saplings and mature trees sharing the same fungal genets. Across all plots, the physical size of individual trees or fungal genets was positively related to their MN connectivity. This together with size asymmetries among different genets and trees resulted in the self-organization of complex, hierarchical scale-free MN architectures. The MNs appear robust to random perturbations but susceptible to the loss of large trees or fungal genets. No MN structural differences were found between phytocentric and mycocentric models or between xeric versus mesic plots. The pervasive mycelia and extensive MNs formed by these Rhizopogon spp. could influence interior Douglas-fir stand dynamics and resistance to water stress.
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Books on the topic "Xeric"

1

Warburg, M. R. Ecophysiology of amphibians inhabiting xeric environments. New York: Springer, 1997.

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Ecophysiology of amphibians inhabiting xeric environments. Berlin ;New York: Springer, 1997.

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Warburg, Michael R. Ecophysiology of Amphibians Inhabiting Xeric Environments. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60357-0.

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Murphy, Paul A. An old-growth definition for xeric pine and pine-oak woodlands. Asheville, NC: Southern Research Station, 1997.

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Murphy, Paul A. An old-growth definition for xeric pine and pine-oak woodlands. Asheville, NC: Southern Research Station, 1997.

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Murphy, Paul A. An old-growth definition for xeric pine and pine-oak woodlands. Asheville, NC: Southern Research Station, 1997.

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Murphy, Paul A. An old-growth definition for xeric pine and pine-oak woodlands. Asheville, NC: Southern Research Station, 1997.

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Murphy, Paul A. An old-growth definition for xeric pine and pine-oak woodlands. Asheville, NC: Southern Research Station, 1997.

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Zamora, Benjamin A. The potential of the snowy buckwheat (Eriogonum niveum) for revegetation of xeric mine spoil sites. Princeton, WV: American Society for Surface Mining and Reclamation, 1993.

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Bhagdev, Kanu. Xeri nagan. Rajkot: Navyug, 1992.

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Book chapters on the topic "Xeric"

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Szarzynski, J. "Xeric Islands: Environmental Conditions on Inselbergs." In Inselbergs, 37–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-59773-2_3.

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Warburg, Michael R. "Xeric Habitats and Their Amphibian Inhabitants." In Ecophysiology of Amphibians Inhabiting Xeric Environments, 3–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60357-0_2.

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Warburg, Michael R. "Introduction." In Ecophysiology of Amphibians Inhabiting Xeric Environments, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60357-0_1.

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Warburg, Michael R. "Structural and Functional Adaptations of Key Organs." In Ecophysiology of Amphibians Inhabiting Xeric Environments, 19–55. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60357-0_3.

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Warburg, Michael R. "Receptors, Perception and Behavioural Responses." In Ecophysiology of Amphibians Inhabiting Xeric Environments, 57–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60357-0_4.

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Warburg, Michael R. "Physiological Adaptations." In Ecophysiology of Amphibians Inhabiting Xeric Environments, 67–105. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60357-0_5.

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Warburg, Michael R. "Ecological Adaptations." In Ecophysiology of Amphibians Inhabiting Xeric Environments, 107–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60357-0_6.

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Warburg, Michael R. "Reflections and Conclusions." In Ecophysiology of Amphibians Inhabiting Xeric Environments, 133–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60357-0_7.

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Mares, Michael A. "Mammal Faunas of Xeric Habitats and the Great American Interchange." In Topics in Geobiology, 489–520. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4684-9181-4_19.

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Pastor, J., A. Martín, and S. Oliver. "Response of wild subclovers to soil calcium in xeric and acid Spanish soils." In Optimization of Plant Nutrition, 603–9. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-017-2496-8_94.

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Conference papers on the topic "Xeric"

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Isetti, Carlo, Enrico Nannei, Stefano Lazzari, Bernardo Cerrai, and Sergio Nari. "XERIC climate-control system for energy-efficient electric vehicles: First experimental results and numerical evaluation of the overall performance." In 2018 Thirteenth International Conference on Ecological Vehicles and Renewable Energies (EVER). IEEE, 2018. http://dx.doi.org/10.1109/ever.2018.8362410.

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Bass, Jennifer, and Colin Robins. "VARIATIONS OF SOIL-BEDROCK GEOCHEMISTRY ALONG A SAN GABRIEL VALLEY CATENA: IMPLICATIONS FOR LANDSCAPE EVOLUTION IN A CHANGING SOUTHERN CALIFORNIA XERIC CLIMATE." In 116th Annual GSA Cordilleran Section Meeting - 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020cd-347110.

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Bass, Jennifer, and Colin Robins. "VARIATIONS OF SOIL-BEDROCK GEOCHEMISTRY ALONG A SAN GABRIEL VALLEY CATENA: IMPLICATIONS FOR LANDSCAPE EVOLUTION IN A CHANGING SOUTHERN CALIFORNIA XERIC CLIMATE." In Cordilleran Section-117th Annual Meeting-2021. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021cd-363355.

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Schuh, Henry N., Weihao Liang, Ming Liu, Jacob Nelson, and Arvind Krishnamurthy. "Xenic." In SOSP '21: ACM SIGOPS 28th Symposium on Operating Systems Principles. New York, NY, USA: ACM, 2021. http://dx.doi.org/10.1145/3477132.3483555.

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Reports on the topic "Xeric"

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Murphy, Paul A., and Gregory J. Nowacki. An old-growth definition for xeric pine and pine-oak woodlands. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station, 1997. http://dx.doi.org/10.2737/srs-gtr-007.

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Murphy, Paul A., and Gregory J. Nowacki. An old-growth definition for xeric pine and pine-oak woodlands. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station, 1997. http://dx.doi.org/10.2737/srs-gtr-7.

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