Готові списки джерел за темами / Center for Tropical Forest Science

Добірка наукової літератури з теми "Center for Tropical Forest Science"

Автор: Grafiati
Опубліковано: 27 липня 2024
Оновлено: 28 липня 2024

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Статті в журналах з теми "Center for Tropical Forest Science"

1

Losos, E. "The Smithsonian's center for tropical forest science: Addressing carbon sequestration forestry projects." Corporate Environmental Strategy 6, no. 1 (1999): 66–67. http://dx.doi.org/10.1016/s1066-7938(00)80011-1.

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Cardelús, Catherine L., Amare Bitew Mekonnen, Kelsey H. Jensen, Carrie L. Woods, Mabel C. Baez, Martha Montufar, Kathryn Bazany, Berhanu Abraha Tsegay, Peter R. Scull, and William H. Peck. "Edge effects and human disturbance influence soil physical and chemical properties in Sacred Church Forests in Ethiopia." Plant and Soil 453, no. 1-2 (June 23, 2020): 329–42. http://dx.doi.org/10.1007/s11104-020-04595-0.

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Abstract Aims Tropical forests are increasingly threatened by edge effects as forest degradation and deforestation continues, compromising soil integrity, seedling regeneration capacity, and ecosystem services. Ninety-three percent of the last remaining forests of northern Ethiopia, which number 1022 in the South Gondar region of our study, are <16 ha and are protected because they have a Tewahido Orthodox Christian church at their center. The aim of this study was to determine the effects of human disturbance, forest size, distance from population center and other factors on the soil properties and nutrient status of sacred church forests. We also compared forest soil physical and chemical properties across land cover types in these forests. Methods We assessed the soil physical (water content and bulk density) and chemical (total carbon and nitrogen, available phosphorus, ammonium) properties of 40 sacred church forests across three spatial scales: within individual forests; among forests; and across land cover type (forest, forest edge-exterior, Eucalyptus plantation). We used distance from the edge within each forest to examine edge effects on soil nutrients. Results We found that nutrients and carbon decreased significantly from the interior to the outer edge of these forests and with forest size. Further, the soil of Eucalyptus plantations and areas outside of the forest were largely indistinguishable; both had significantly lower nutrient concentrations than sacred church forest soil. Conclusion Our research highlights the insidious impacts of edge effects and human disturbance on forest soils and the need for an integrated soil management program in the region that balances local needs with forest conservation. The conservation of these sacred church forests is important for maintaining regional soil nutrient status relative to agricultural lands and Eucalyptus plantations.
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Daba, Damena Edae, Bikila Workineh Dullo, and Teshome Soromessa. "Effect of Forest Management on Carbon Stock of Tropical Moist Afromontane Forest." International Journal of Forestry Research 2022 (September 30, 2022): 1–14. http://dx.doi.org/10.1155/2022/3691638.

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Moist tropical forests have a significant role in provisioning and regulating ecosystem services. However, these forests are under threat of deforestation and forest degradation. In Ethiopia, the moist evergreen Afromontane forests have the potential for carbon storage and support a high diversity of plant species. However, it is under severe threat of deforestation and degradation.This investigation was conducted to obtain adequate information on the carbon stock potential of the moist Afromontane forest of southwestern Ethiopia. A comparison of carbon stock was conducted between disturbed and undisturbed forests. A systematic sampling design was applied for recording woody species and soil data. A total of 100 main plots of 400 m2 were laid to record trees and shrubs with a diameter at breast height (DBH) ≥ 5 cm. The soil data were collected from 1 m2 subplots established at the four corners and the center of each main plot. The DBH and height were measured to calculate the aboveground carbon of trees and shrubs with DBH ≥ 5 cm. A total of 68 tree and shrub species belonging to 59 genera and 33 families were recorded. The mean carbon stock density was 203.80 ± 12.38 t·ha–1 (aboveground carbon stock) and 40.76 ± 2.47 t·ha–1 (belowground carbon stock). The highest proportion of aboveground carbon (t·ha–1) (42.34%) was contributed by a few tree individuals with DBH > 70 cm. The soil organic carbon stock (SOCS) (t·ha–1) for the depth of 0–30 cm is ranging from 58.97 to 198.33 across plots; the mean is 117.16 ± 3.15. The carbon stored in the moist Afromontane forest indicates its huge potential for climate change mitigation. Therefore, for the enhancement of forest biodiversity and carbon sequestration effective conservation measure and sound management approach is essential.
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Vincent, Valdimir, Fabiola Roja-García, and Andy Barthelemy Nahum Lafleur. "Diversidad y estructura de las especies forestales en Sarazin, Departamento Centro, Haití." e-CUCBA 10, no. 19 (December 22, 2022): 112–20. http://dx.doi.org/10.32870/ecucba.vi19.270.

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The present study carried out in secondary tropical forests of Sarazin, 2nd communal section of Mirebalais, Haiti aims to describethe diversity and structure of forest species to promote their conservation. A systematic sampling consisting of four transects of10,000 m long and 1,000 m wide was carried out, in each one five square plots were evaluated (20 plots). The diversity of forestspecies was characterized by calculating diversity indices. The structure of the forest species was described through the distributionof individuals by diameter class with a width of 10 cm and by height class with a width of 5 m. The surveys show that the studyarea has a partial specific richness of 40 species divided into 38 genera and 23 families. The Fabaceae family was the mostrepresentative with 11 species, and the most abundant species was Prosopis juliflora. Natural and human disturbances influence thediametrical and vertical structure. The structural analysis showed that, despite the existence of a reasonable number of species, inmost cases they are trees in minimal quantities, small and sporadically distributed. Despite disturbances correlated withanthropogenic activities and extreme weather events, Sarazin's tropical forests have shown some resilience.
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Viennois, Gaëlle, Eric A. Nicolini, and Frédéric Borne. "Forest vs Savanna dynamics in the contact zones of French Guiana." Revue Française de Photogrammétrie et de Télédétection, no. 208 (September 5, 2014): 89–95. http://dx.doi.org/10.52638/rfpt.2014.104.

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Savannas and tropical forests delineated by sharp boundaries are two alternative stable ecosystems. What is the natural evolution of forests over savannas in coastal savanna in French Guiana? The dynamic balance between forest advance and retreat is a response to disturbances such as fire or extreme drought events. Fire maintains savanna by its action on forest-savanna contact areas, while a dry climate prevents forest expansion. This paper focuses on coastal savannas of French Guiana nested in the Guiana Space Center (CSG) that is occasionally threatened by bushfires in the dry season. This study spanned over 60 years of landscape changes around the CSG and used a georeferenced set of aerial and Pléiades satellite images. Forest and savanna dynamics were mapped and highlighted with the computing of shape indicators. This study showed that the forest progressed of 23% onto savanna and mainly at the forest—savanna contact zones.
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Lobo-Araújo, Lahert William, Mariellen Cristine Costa, Luís Fábio Silveira, and Mercival Roberto Francisco. "Massive Bird Nest Losses: A Neglected Threat for Passerine Birds in Atlantic Forest Fragments from the Pernambuco Endemism Center." Diversity 16, no. 4 (March 29, 2024): 207. http://dx.doi.org/10.3390/d16040207.

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Understanding the mechanisms by which tropical forest fragmentation can affect the persistence of species and populations is of scientific and practical interest. However, nest survival has been one the least addressed of the potentially harmful effects associated with habitat fragmentation, and studies involving nest predator’s identification are still underdeveloped. The Pernambuco Endemism Center (PEC) is the part of the Atlantic Forest located north of the São Francisco River, in northeastern Brazil, where large forest tracts no longer exist and a wave of bird extinctions has occurred recently. Here, we investigated the nest survival of forest understory birds from three PEC fragments (690, 979, and 1036 ha), and we used infra-red camera traps for predators’ identification. Overall, the apparent nest survival was 15.5%, and nest-day-based survival probability for the four more representative species (including two endemic and threatened taxa) were 2.6, 4.4, 6.9, and 18.9%, being 2.7 to 8.5 times smaller than populations or related taxa from the Atlantic Forest of southeastern Brazil. Predators were marmosets (25%), opossums (25%), tegu (19.4%), coati (16.7%), snakes (8.3%), and hawks (5.5%). Jackknife2 model-predicted nest predator’s richness was 20.7 (SD = 1.6). We reinforce the evidence that nest predation associated with fragmentation can affect negatively the bird populations from tropical forests.
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Meyer, V., S. S. Saatchi, J. Chave, J. W. Dalling, S. Bohlman, G. A. Fricker, C. Robinson, M. Neumann, and S. Hubbell. "Detecting tropical forest biomass dynamics from repeated airborne lidar measurements." Biogeosciences 10, no. 8 (August 14, 2013): 5421–38. http://dx.doi.org/10.5194/bg-10-5421-2013.

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Abstract. Reducing uncertainty of terrestrial carbon cycle depends strongly on the accurate estimation of changes of global forest carbon stock. However, this is a challenging problem from either ground surveys or remote sensing techniques in tropical forests. Here, we examine the feasibility of estimating changes of tropical forest biomass from two airborne lidar measurements of forest height acquired about 10 yr apart over Barro Colorado Island (BCI), Panama. We used the forest inventory data from the 50 ha Center for Tropical Forest Science (CTFS) plot collected every 5 yr during the study period to calibrate the estimation. We compared two approaches for detecting changes in forest aboveground biomass (AGB): (1) relating changes in lidar height metrics from two sensors directly to changes in ground-estimated biomass; and (2) estimating biomass from each lidar sensor and then computing changes in biomass from the difference of two biomass estimates, using two models, namely one model based on five relative height metrics and the other based only on mean canopy height (MCH). We performed the analysis at different spatial scales from 0.04 ha to 10 ha. Method (1) had large uncertainty in directly detecting biomass changes at scales smaller than 10 ha, but provided detailed information about changes of forest structure. The magnitude of error associated with both the mean biomass stock and mean biomass change declined with increasing spatial scales. Method (2) was accurate at the 1 ha scale to estimate AGB stocks (R2 = 0.7 and RMSEmean = 27.6 Mg ha−1). However, to predict biomass changes, errors became comparable to ground estimates only at a spatial scale of about 10 ha or more. Biomass changes were in the same direction at the spatial scale of 1 ha in 60 to 64% of the subplots, corresponding to p values of respectively 0.1 and 0.033. Large errors in estimating biomass changes from lidar data resulted from the uncertainty in detecting changes at 1 ha from ground census data, differences of approximately one year between the ground census and lidar measurements, and differences in sensor characteristics. Our results indicate that the 50 ha BCI plot lost a significant amount of biomass (−0.8 Mg ha−1 yr−1 ± 2.2(SD)) over the past decade (2000–2010). Over the entire island and during the same period, mean AGB change was 0.2 ± 2.4 Mg ha−1 yr−1 with old growth forests losing −0.7 Mg ha−1 yr−1 ± 2.2 (SD), and secondary forests gaining +1.8 Mg ha yr−1 ± 3.4 (SD) biomass. Our analysis suggests that repeated lidar surveys, despite taking measurement with different sensors, can estimate biomass changes in old-growth tropical forests at landscape scales (>10 ha).
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Good, Peter, Chris Jones, Jason Lowe, Richard Betts, and Nicola Gedney. "Comparing Tropical Forest Projections from Two Generations of Hadley Centre Earth System Models, HadGEM2-ES and HadCM3LC." Journal of Climate 26, no. 2 (January 15, 2013): 495–511. http://dx.doi.org/10.1175/jcli-d-11-00366.1.

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Abstract Future changes in atmospheric greenhouse gas concentrations and associated influences on climate could affect the future sustainability of tropical forests. The authors report on tropical forest projections from the new Hadley Centre Global Environmental Model version 2 Earth System configuration (HadGEM2-ES) and compare them to results from the previous generation model [third climate configuration of the Met Office Unified Model in lower resolution with carbon cycle (HadCM3LC)], which had projected near-complete dieback of the Amazon rain forest for a business as usual scenario. In contrast, HadGEM2-ES projects minimal change in Amazon forest extent. The main aim of this study is a preliminary investigation of this difference between the two models. It is found that around 40% of the difference in forest dieback projections is associated with differences in the projected change in dry-season length. Differences in control climatologies of temperature and dry-season length, projected regional warming, and the forest response to climate and CO2 also all contribute to the increased survival of forest in HadGEM2-ES. However, HadGEM2-ES does not invalidate HadCM3LC: Amazon dieback remains a possible scenario of dangerous change that requires further understanding. The authors discuss the relevance to assessments of dieback risk and future work toward narrowing uncertainty about the fate of the Amazon forest.
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Ashton, Peter. "Tree Demography Plots." Sibbaldia: the International Journal of Botanic Garden Horticulture, no. 16 (July 26, 2018): 9–21. http://dx.doi.org/10.24823/sibbaldia.2018.244.

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The pantropical network of large tree demography plots coordinated by the Smithsonian’s Center for Tropical Forest Science has now gone global, as part of the Smithsonian Institution Global Earth Observatories. Some four million tropical trees, representing about 10,000 species, are now tagged, provisionally identified and periodically recensused. Some 3,000 species are captured in the six plots within Malesia. These include species rarely collected and many that are now endangered. Easy location of trees for periodic examination for fertile material and detailed ecological data, together with seasoned in-country research teams, provide unique opportunities for research collaboration.
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Fu, Chang, Xiqiang Song, Yu Xie, Cai Wang, Jianbiao Luo, Ying Fang, Bing Cao, and Zixuan Qiu. "Research on the Spatiotemporal Evolution of Mangrove Forests in the Hainan Island from 1991 to 2021 Based on SVM and Res-UNet Algorithms." Remote Sensing 14, no. 21 (November 3, 2022): 5554. http://dx.doi.org/10.3390/rs14215554.

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Mangrove ecosystems play a dominant role in global, tropical, and subtropical coastal wetlands. Remote sensing plays a central role in mangrove conservation, as it is the preferred tool for monitoring changes in spatiotemporal distribution. To improve correlated estimation accuracies and explore the influencing mechanisms based on the mangrove ground survey, this study used a support vector machine (SVM) machine learning and Res-UNet deep learning algorithms to identify the land area of mangrove forests and the crown surface cover area of mangrove forests in the Hainan Island from 1991 to 2021. Both classification techniques were verified by a confusion matrix, which from 1991 to 2021, revealed overall accuracies of 93.11 ± 1.54% and 96.43 ± 1.15% for SVM and Res-UNet, respectively. Res-UNet was more accurate in identifying the crown surface cover area, whereas SVM was more suitable for obtaining the land area. Furthermore, based on the crown surface cover area of the mangrove forests on the Hainan Island, influencing mechanisms were analyzed through dynamic changes and landscape patterns. Since 1991, the Hainan Island mangrove forest area has increased, with the center of mass moving from coastal areas to the ocean and increasing the overall landscape fragmentation. Moreover, the change in the mangrove forests area was correlated with economic development and the increasingly urban population of the entire island. Altogether, the reliable assessment of the tropical mangrove forest land area and crown surface cover provides an important research foundation for the protection and restoration plans of tropical mangrove forests.
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Дисертації з теми "Center for Tropical Forest Science"

1

Lammerant, Roel. "Impact of experimental soil moisture manipulation on tropical tree seedling demographic fates and functional traits." Thesis, Uppsala universitet, Institutionen för biologisk grundutbildning, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-436103.

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In tropical regions, climate change is predicted to lead to increased drought frequency and intensity. The extent to which this will shift the functional diversity of tropical tree communities is unknown due to a limited understanding about the response of seedlings to variable soil moisture. We addressed this issue using an experimental approach in the Luquillo Experimental Forest, Puerto Rico. We exposed seedlings of eight tree species, representing different successional stages, to an experimental soil moisture gradient. We evaluated (1) How species mean trait values relate to species-specific demographic responses to drought, (2) How intraspecific variation in functional traits relates to a soil moisture gradient, (3) The extent to which demographic response to short-term experimental drought mirrored long-term demographic response of seedlings to natural variation in soil moisture. Growth and survival of species with more `conservative` functional strategies tended to be more sensitive to a change in soil moisture and more tolerant to drought compared to species with more `acquisitive` strategies. In addition, traits of individual seedlings within species varied with respect to soil moisture, suggesting a potential role for phenotypic plasticity in response to drought. Specifically, this response was significant for three species (Inga laurina, Guarea guidonia, Schefflera morototoni) and was primarily associated with relative carbon investment in leaves and roots. Species demographic responses to soil moisture in experimental and long-term studies were weakly positively correlated but more variables are at play under natural conditions, which partly decouples these responses. Overall, our results suggest that tree species with `conservative` functional strategies are likely to become more common under increasing drought frequency and intensity in the Luquillo Mountains of Puerto Rico. However, understanding the broader implications of our findings will require considering the effects of other disturbances, including hurricanes, which may have contrasting effects. Furthermore, intraspecific variation in functional traits is likely to influence how the seedlings of tropical tree species cope with drought.
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2

Carver, Daniel Peter. "Assessment of the Representational Accuracy of GlobeLand30 Classification of the Temperate and Tropical Forest of Mexico." Thesis, University of Colorado at Denver, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10275782.

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This study performed an assessment of the representational accuracy of the forest class of the GlobeLand30 (GL30) global land cover data sets for the country of Mexico using a robust geographically distributed forest inventory survey of the forests in Mexico. The representational accuracy assessment was carried out for both the 2000 and 2010 GL30 data sets. The detailed attribute data associated with the validation set demonstrates how GL30 classifies specific forest types and how canopy coverage and number for trees per site influence the likelihood of GL30 identifying the sites correctly as forests. The results indicate that producers accuracies range from 72.3% to 97.3%. The tropical forests (89.1%) were better represented by the GL30 forest class than the temperate forest (73.9%). The most poorly represented classes from the temperate (oak: 72.3%) and tropical (low dry deciduous jungle: 74.9%) groups were deciduous. Receiver Operator Curve and Area Under the Curve analyses show that canopy coverage of a site is a better predictor of GL30, correctly identifying the site as forest for temperate forest, and that the number of the trees per site is a better predictor of GL30 correctly identifying a site as forest for tropical forests. The results also indicate a distinct spatial variability in the location of the sample sites that are misidentified as forests by GL30. The results of this thesis will help researchers and professionals better understand the representational accuracy of the GL30 data sets for the forests in Mexico.

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Kefa, Christopher Amutabi. "Assessing the Impacts of Bioenergy Extraction and Human Land Use of the Biodiversity of Kakamega Tropical Rainforest, Kenya." Bowling Green State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1465254368.

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Mlotha, McArd Joseph. "Analysis of Land Use/Land Cover Change Impacts Upon Ecosystem Services in Montane Tropical Forest of Rwanda: Forest Carbon Assessment and REDD+ Preparedness." Antioch University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=antioch1527773591460797.

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5

Chi, Curtis H. "Architecture and site: a field research center for the studies of environmental science, horticulture, landscape architecture, and forestry." Thesis, Virginia Polytechnic Institute and State University, 1993. http://hdl.handle.net/10919/53344.

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Анотація:
The relationship of building to site is the most fundamental aspect in the creation of architecture. As man is a product of nature and his environment the way in which he chooses to after that environment in the process of building reveals not only his attitude towards his physical surroundings, but his purpose and justification for dwelling there. Not all attitudes will be the same, just as purpose will vary from person to person and structure to structure. Mario Botta has said, “The first step in the architectural act is taking possession of the site. It is a conscious act of transforming a unicum, an awareness that grounds the new intervention in the geography, history, and culture of a particular site. The architecture is the constriction of this site. There can be no indifference toward the site. It is the very territory of architecture as well as the primary condition determining the laws by which one must build.” Within the scope of my project I hoped to define this awareness within myself, this conscious act of defining and creating architecture against a background that demands the site be recognized as a primary generator of architectural form and attitude.
Master of Architecture
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Chanyenga, Tembo Faera. "Effect of population size on viable seed output, seed rand and natural regeneration pattern of a tropical conifer Widdringtonia whytei-Rendle in Malawi." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85589.

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Thesis (PhD(For))--Stellenbosch University, 2013.
ENGLISH ABSTRACT: Widdringtonia whytei is a tropical endemic, fire-adapted pioneer coniferous tree species within natural fire-fragmented Afromontane forest patches in a confined area on Mulanje Mountain in Malawi. Natural and anthropogenic fires within the surrounding fire-prone landscape, insect attacks, and uncontrolled harvesting of mature trees for timber threaten the survival of W. whytei. This study investigated the effects of population fragmentation on the reproductive biology of W. whytei, through four specific studies: effects of population size, tree size and crown position on viable seed output; seed rain variation among population sizes; effects of temperature and light on viability and germination of W. whytei seeds; and the influence of population size on natural regeneration patterns. The study was conducted during 2008 and 2009 on three sites using three W. whytei population sizes: small (≤10 reproductively mature cone-bearing W. whytei trees), medium (11-20 cone-bearing trees) and large (>20 cone-bearing trees). Data were collected using field and laboratory experiments and a review of secondary information. The effect of fragment size and crown position on viable seed output and seed rain pattern was tested with a nested linear mixed model. The influence of stem diameter (dbh) on viable seed output was tested using a separate data set. The variation in seed rain was explored with a generalised linear model (GLM) with a negative binomial link function. Variations in seed germination was analysed with a Weibull regression model. The influence of fragment size on seedling regeneration was tested with a GLM (binary logistic regression). Viable seed output from W. whytei cones was very low (23%) and was not affected by population size, tree diameter or crown position. W. whytei population size influenced seed rain with large fragments having higher seed rain densities. Number of dispersed seeds was generally very low and poorly dispersed. W. whytei cones are semiserotinous and depends on moderate to severe fires for heavy seedfall and wider dispersal. Such fires did not occur during the study period. Temperature is a critical factor for seed germination. Seeds germinate between 15 and 25°C with the optimum at ~ 20°C either under light or dark conditions. Regeneration density followed the seed rain pattern indicating that seed availability is a critical factor for regeneration. Regular cool fires outside the forest patches and along the edges during the hot dry season, and the thick litter layer and shady conditions inside forest patches, caused most of the seedling mortality. This study highlighted the difficulties W. whytei experiences with low output of viable seed, limited seed dispersal and low seedling regeneration in and around forest patches, i.e. factors important for conservation management of this species. It is recommended that gaps with diameter equal to canopy height and occasional spot fires would promote seed dispersal onto exposed mineral soil for rapid seedling establishment and subsequent population growth. Such natural fire disturbance events may show the true seed rain and seedling establishment patterns in this species.
AFRIKAANSE OPSOMMING: Widdringtonia whytei is ‘n tropiese endemiese, vuuraangepaste pionier naaldhoutagtige boomsoort binne die natuurlike vuurgefragmenteerde Afromontane woudkolle binne ‘n beperkte area op Mulanje berg in Malawi. Natuurlike en menslike vure binne die omringende vuurgeneigde landskap, insekaanvalle, en onbeheerde kap van volwasse bome vir hout bedreig die voortbestaan van W. whytei. Hierdie studie het die effek van populasiefragmentasie op die voortplantingsbiologie van W. whytei ondersoek, deur vier spesifieke studies: die effek van populasiegrootte, boomgrootte en kroonposisie op produksie van lewenskragtige saad; saadreënvariasie tussen populasiegroottes; die effek van temperatuur en lig op lewenskragtigheid en ontkieming van W. whytei saad; en die invloed van populasiegrootte op natuurlike verjongingspatrone. Die studie is gedurende 2008 en 2009 uitgevoer op drie groeiplekke met drie W. whytei populasiegroottes: klein (≤10 keëldraende (volwasse) W. whytei bome), medium (11-20 keëldraende bome) en groot (>20 keëldraende bome). Data is versamel in veld- en laboratorium eksperimente asook 'n oorsig van sekondêre inligting. Die invloed van populasie fragmentgrootte en kroonposisie van bome op saadproduksie en die saadreënpatroon is getoets met ‘n geneste liniêre gemengde model. Die invloed van boomstamdeursnee op die produksie van kiemkragtige saad is met ‘n aparte datastel getoets. Die variasie in saadreënpatroon is met 'n algemene liniêre model (GLM) met 'n negatiewe binomiese skakelfunksie getoets. Variasies in ontkiemingspersentasie van sade is met 'n Weibull regressiemodel ontleed. Die invloed van fragmentgrootte op saailingverjonging is met 'n algemene linêre model (binêre logistiese regressie) getoets. Produksie van lewenskragtige saad in W. whytei keëls was baie lag (23%) en was nie deur populasiegrootte, boomstamdeursnee of kroonposisie beïnvloed nie. W. whytei populasiegrootte het saadreën beïnvloed en groot fragmente het groter saadreëndigthede gehad. Die aantal verspreide sade was in die algemeen baie laag en swak versprei. W. whytei keëls is semi-saadhoudend (serotinous) en is afhanklik van matige tot intense vure vir massiewe saadvrystelling en wyer saadverspreiding. Sulke vure het nie gedurende die studieperiode voorgekom nie. Temperatuur is ‘n kritiese factor vir saadontkieming. Sade ontkiem goed tussen 15 en 25°C met die optimum rondom ~ 20°C onder beide lig en donker toestande. Fragmentgrootte het nie die saailingverjonging in W. whytei beïnvloed nie. Verjongingsdigtheid het die saadreënpatroon gevolg, wat daarop dui dat saadbeskikbaarheid ‘n kritiese factor is vir saailingverjonging. Gereelde koel vure buite die woudkolle en langs die woudrand gedurende die droë warm seisoen, en die dik lae blaarval (litter) en skadutoestande binne ‘n woud, het meeste van die saailingmortaliteit veroorsaak. Hierdie studie het die probleme beklemtoon wat W. whytei ondervind met die lae produksie van kiemkragtige saad, saadverspreiding en saailingverjonging binne en rondom die woudkolle, m.a.w. faktore wat belangrik is vir bewaringsbestuur van hierdie boomsoort. Die aanbeveling word gemaak dat kroonopeninge met ‘n deursnee gelyk aan minstens die kroonhoogte, en sporadiese kolbrande binne die woudkolle kan saadverspreiding op blootgestelde minerale grond vir vinnige saailingvestiging en gevolglike populasiegroei bevorder. Sodanige vuurversteuringsgeleenthede mag die werklike patrone in saadreën en saailingvestiging in hierdie species toon.
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7

Gleitsmann, Anke. "Exploiting the spatial information in high resolution satellite data and utilising multi-source data for tropical mountain forest and land cover mapping." Doctoral thesis, Stuttgart Ibidem-Verl, 2005. http://deposit.d-nb.de/cgi-bin/dokserv?id=2852171&prov=M&dok_var=1&dok_ext=htm.

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8

Dechert, Georg. "Nutrient dynamics and their control in land use systems of forest margins in Central Sulawesi, Indonesia." Doctoral thesis, [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=970744676.

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9

"The susceptibility of tropical forest bird communities to habitat fragmentation." Tulane University, 2007.

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Анотація:
Habitat fragmentation impacts on bird communities are relatively well studied in the temperate zone, where brood parasites and non-forest predators are the main causes of declining avian biodiversity. However, life history traits of tropical species suggest different and more diverse effects of habitat fragmentation on tropical bird communities. This dissertation used historical data and quantitative comparisons of fragmented and control sites to infer causes and patterns of tropical avian community response to fragmentation in Central America. Particular ecological guilds, namely forest understory insectivores, mixed-species flock participants, and birds that nest on or near the ground declined or disappeared from La Selva Biological Station, Costa Rica since the 1950s as the site became increasingly isolated from other forest. Spot-maps of twenty-two insectivorous bird species at La Selva in the 1970s indicate that insectivore populations were probably never large enough to be viable, emphasizing the need for larger reserves given the low density of many tropical forest species. Comparisons of four forest sites (24.6-1200 ha) to an non-fragmented control site in southeastern Nicaragua show significant reduction in biodiversity, corresponding decline in total bird abundance, and changes in community composition, even in the larger sites. Lack of change in the Nicaraguan control site suggests landscape changes rather than climate change is the most parsimonious explanation for community changes in the fragments. Finally, comparison of community changes in two large isolated forest reserves, La Selva and Barro Colorado Island, Panama, demonstrate similar patterns of losses of insectivores and low nesting species. However, landscape level and climatic differences between the two sites also affect the ability of some species to persist in remaining forest. Overall, this dissertation suggests that deterministic factors, especially ecological characteristics, put particular species at risk to landscape changes. No single mechanism appears to explain all the patterns, but small population size, poor dispersal ability, and increase in nest depredation are implicated by this study. Further investigation is needed to assess the relative importance of these and other mechanisms. Moreover, trophic cascades involving other taxa are predicted as a result of the lack of ecological replacement of disappearing specialized forest insectivores
acase@tulane.edu
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10

Harteveld, Marieke. "The impact of forest disturbance on the fine root system of a tropical forest on Sulawesi, Indonesia." Doctoral thesis, 2007. http://hdl.handle.net/11858/00-1735-0000-0006-ACD6-3.

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Книги з теми "Center for Tropical Forest Science"

1

Finkeldey, Reiner. Tropical forest genetics. Berlin: Springer, 2007.

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2

Suzuki, Kazuo, Katsuaki Ishii, Shobu Sakurai, and Satohiko Sasaki, eds. Plantation Technology in Tropical Forest Science. Tokyo: Springer-Verlag, 2006. http://dx.doi.org/10.1007/4-431-28054-5.

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K, Suzuki, ed. Plantation technology in tropical forest science. Tokyo: Springer, 2006.

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Kenneth, Miyata, ed. Tropical nature. New York: Simon & Schuster, 1995.

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5

R, Wylie F., ed. Insect pests of tropical forestry. New York: CABI Pub., 2001.

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6

Kerala Science Congress (9th 1997 Kerala, India). Biodiversity and tropical forests, the Kerala scenario: A compendium of background papers on the focal theme of Ninth Kerala Science Congress. Edited by Pushpangadan P, Nair K. S. S, and Kerala (India). State Committee on Science, Technology, and Environment. [Thiruvananthapuram]: State Committee on Science, Technology, and Environment, 1997.

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7

McGuire, Krista L., Amadou M. Bâ, and Abdala G. Diédhiou. Ectomycorrhizal symbioses in tropical and neotropical forests. Boca Raton: CRC Press, Taylor & Francis Group, 2014.

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8

GUTSHOP '84 (1984 Pacific Grove, Calif.). Contemporary studies on fish feeding: The proceedings of GUTSHOP '84 : papers from the fourth workshop on fish food habits held at the Asilomar Conference Center, Pacific Grove, California, U.S.A., December 2-6, 1984. Dordrecht: W. Junk Publishers, 1986.

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9

Moffett, Mark W. The high frontier: Exploring the tropical rainforest canopy. Cambridge, Mass: Harvard University Press, 1993.

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10

International Conference on Tropical Ecosystems: Structure, Diversity, and Human Welfare (2001 Bangalore, India). Tropical ecosystems: Structure, diversity and human welfare : proceedings of the International Conference on Tropical Ecosystems: Structure, Diversity, and Human Welfare, 15-18 July 2001, Bangalore. Edited by Ganeshaiah K. N, Shaanker R. Uma, Bawa Kamaljit S, Ashoka Trust for Research in Ecology and the Environment, and Association for Tropical Biology. New Delhi: Oxford & IBH Pub., 2001.

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Частини книг з теми "Center for Tropical Forest Science"

1

de Oliveira Loconte, Caio. "The Volumetric Sustainability of Timber-Based Tropical Forest Management." In Forest Science, 51–87. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2846-0_3.

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2

Yamada, Toshihiro, Taketo Yokota, Akio Furukawa, Makmon Abudulla, Samusddin Johan, and Muhamad Awang. "Growth Performance of Malaysian Tropical Trees under Different Light Regimes." In Environmental Forest Science, 387–93. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5324-9_42.

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3

Awang, Muhamad, Ahmad Makmom Abdullah, and Akio Furukawa. "Photosynthetic Light Environment of Tropical Lowland Forest and Growth Response of Shorea Leprosula." In Environmental Forest Science, 379–86. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5324-9_41.

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4

Cole, D. W., and P. S. Homann. "Forest Conversion Effects on Tropical Forest Productivity--Myths, Realities, Uncertainties." In Future Developments in Soil Science Research, 405–12. Madison, WI, USA: Soil Science Society of America, 2015. http://dx.doi.org/10.2136/1987.futuredevelopmentssoil.c43.

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5

Rennolls, Keith, and Yves Laumonier. "Analysis of Species Hyper-diversity in the Tropical Rain Forests of Indonesia: the Problem of Non-observance." In Environmental Forest Science, 355–62. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5324-9_38.

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Mitchell, Andrew. "Introduction — Canopy science: time to shape up." In Tropical Forest Canopies: Ecology and Management, 5–11. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-017-3606-0_1.

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7

Goosem, Stephen, Nigel E. Stork, and Stephen M. Turton. "Rainforest Science and its Application." In Living in a Dynamic Tropical Forest Landscape, 610–17. Oxford, UK: Blackwell Publishing, Ltd, 2009. http://dx.doi.org/10.1002/9781444300321.ch48.

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8

Sutton, Stephen L. "Alice grows up: canopy science in transition from Wonderland to Reality." In Tropical Forest Canopies: Ecology and Management, 13–21. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-017-3606-0_2.

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Racelis, Alex, and James Barsimantov. "Rethinking the Role of Tropical Forest Science in Forest Conservation and Management." In Treetops at Risk, 81–91. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-7161-5_6.

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10

Pearce, Philip L. "The Nature of Rainforest Tourism: Insights from a Tourism Social Science Research Programme." In Living in a Dynamic Tropical Forest Landscape, 94–106. Oxford, UK: Blackwell Publishing, Ltd, 2009. http://dx.doi.org/10.1002/9781444300321.ch7.

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Тези доповідей конференцій з теми "Center for Tropical Forest Science"

1

Bakar, Azinoor Azida Abu, Aminuddin bin Baki, Nurakmal bt Hamzah, Zulkifli bin Yusop, and Muhammad Khairudin bin Khalil. "Throughfall, stemflow and interception loss of artificial tropical forest." In 2012 IEEE Colloquium on Humanities, Science and Engineering (CHUSER). IEEE, 2012. http://dx.doi.org/10.1109/chuser.2012.6504289.

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2

Huong, Nguyen Thi Thanh, Chau Thi Nhu Quynh, Nguyen Duc Dinh, Cao Thi Hoai, Phan Thi Hang, Ho Dinh Bao, Ngo The Son, Le Quang Dan, and Pham Tuan Anh. "Estimating tropical forest stand volume using Sentinel-2A imagery." In 2021 Second International Conference on Intelligent Data Science Technologies and Applications (IDSTA). IEEE, 2021. http://dx.doi.org/10.1109/idsta53674.2021.9660808.

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3

K Abdul Hamid, Abdul Aziz, R. U. Gobithaasan, Sumazly Sulaiman, and Nur Syazwani. "Tropical Rain Forest Monitoring and Evaluation using Image Segmentation Approach." In The 2nd World Congress on Electrical Engineering and Computer Systems and Science. Avestia Publishing, 2016. http://dx.doi.org/10.11159/mvml16.106.

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4

Sader, Steven A., Thomas Sever, and James C. Smoot. "Time-series tropical forest change detection: a visual and quantitative approach." In SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, edited by Brian Huberty, Joan B. Lurie, Jule A. Caylor, Pol Coppin, and Pierre C. Robert. SPIE, 1996. http://dx.doi.org/10.1117/12.256076.

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5

Asmawati, Yunita, Syamsuri, and Puput Ratnasari. "Industrial Revolution 4.0 Through the Tropical Forest: Empowering State Capability of Indonesia." In 1st Progress in Social Science, Humanities and Education Research Symposium (PSSHERS 2019). Paris, France: Atlantis Press, 2020. http://dx.doi.org/10.2991/assehr.k.200824.249.

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6

Latif, Zulkiflee Abd, Hud Mohamad Zaqwan, Mohamed Saufi, Nor Aizam Adnan, and Hamdan Omar. "Deforestation and carbon loss estimation at tropical forest using multispectral remote sensing: Case study of Besul Tambahan Permanent Forest Reserve." In 2015 International Conference on Space Science and Communication (IconSpace). IEEE, 2015. http://dx.doi.org/10.1109/iconspace.2015.7283797.

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7

Rizaludin Mahmud, Mohd, and Mazlan Hashim. "Determination of forest water yield in Malaysian tropical watershed using calibrated satellite-based rainfall data." In 2010 International Conference on Science and Social Research (CSSR). IEEE, 2010. http://dx.doi.org/10.1109/cssr.2010.5773895.

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8

Azar, Alda Wydia Prihartini, Dian Rosleine, and Ahmad Faizal. "Secondary metabolite profiles in the methanolic extract of Leucobryum javense isolated from tropical montane forest in West Java, Indonesia." In INTERNATIONAL CONFERENCE ON BIOLOGY AND APPLIED SCIENCE (ICOBAS). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5115631.

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Rizal, Teuku Azuar, Hamdani, and Taufan Arif Adlie. "Modeling of Spray Characteristics of Biodiesel Based on Vegetative Energy Resources Found in Tropical Forest Inside Leuser Area." In 2nd Borobudur International Symposium on Science and Technology (BIS-STE 2020). Paris, France: Atlantis Press, 2021. http://dx.doi.org/10.2991/aer.k.210810.007.

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10

Budi, Anang Setyo, Tetri Widiyani, and Agung Budiharjo. "Daily behavior of the mudskippers at Wonorejo Mangrove Forest Surabaya." In INVENTING PROSPEROUS FUTURE THROUGH BIOLOGICAL RESEARCH AND TROPICAL BIODIVERSITY MANAGEMENT: Proceedings of the 5th International Conference on Biological Science. Author(s), 2018. http://dx.doi.org/10.1063/1.5050099.

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Звіти організацій з теми "Center for Tropical Forest Science"

1

McFarlane, Karis J. Terrestrial Ecosystem Science 2017 ECRP Annual Report: Tropical Forest Response to a Drier Future: Turnover Times of Soil Organic Matter, Roots, Respired CO2, and CH4 Across Moisture Gradients in Time and Space. Office of Scientific and Technical Information (OSTI), May 2017. http://dx.doi.org/10.2172/1363856.

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2

Michaels, Trevor. Red-tailed boa (Boa constrictor) surveys at Salt River Bay National Park, St. Croix U.S. Virgin Islands: 2023 report of activities. National Park Service, 2024. http://dx.doi.org/10.36967/2303799.

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Анотація:
St. Croix is home to a variety of threatened and endangered (T&E) species that are at risk for predation by the invasive red-tailed boa (Boa constrictor), such as the St. Croix ground lizard (Amevia polyps), the ground-nesting least tern (Sterna antillarum), and the hawksbill sea turtle (Eretmochelys imbricata). Genetic analysis determined the original red-tailed boa population on St. Croix sourced from a single female released by a pet owner and its range expands every year. Presently, the main population of red-tailed boa is established on the west end of St. Croix and extends as far east as Salt River. One individual was found in Salt River Marina and additional sightings have occurred in Salt River Bay National Historical Park and Ecological Preserve (SARI) more recently. This inventory aims to search for red-tailed boas in two focal areas that park staff are actively restoring. The park will use information from this inventory to develop a boa removal program and protect sensitive native species like the ground-nesting least tern, the St. Croix ground lizard and the hawksbill sea turtle nests and increase the success of restoration. Snakes are cryptic species, often occurring in low density, and utilize complex habitat patterns. To increase the likelihood of detecting red-tailed boa, the Maryland/Delaware/D.C. Wildlife Services detector dog handling team partnered with the USDA-APHIS National Detector Dog Training Center to train and develop detector dogs to assist in determining the presence/absence of red-tailed boa for this project. Canines were trained to locate red-tailed boa and indicate its presence to the handler via barking three times near the identified target. Two dog detector teams traveled to Salt River Bay National Park (SARI) in St. Croix to conduct surveys for red-tailed boa in habitats likely to contain red-tailed boa in June 2023. Habitat varied throughout the surveys. Close to the bay, mangrove forests dominated and, as elevation increased, transects took place in almost exclusively dry tropical shrub forest. Each transect was surveyed by one dog team. The canine teams had no red-tailed boa detections within SARI. Canines showed proficiency at surveying for red-tailed boa populations in SARI. Given the proximity of confirmed detections to SARI, it is likely red-tailed boa will be in the park in the future, if they are not already. Additional surveys, whether by humans, canines, or both, are recommended in areas of the park that have not been previously surveyed.
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Cleary, Summers. Land Cover Summary Statistics for National Capital Region Park Units. National Park Service, 2024. http://dx.doi.org/10.36967/2301309.

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This report documents the acquisition of source data, and calculation of land cover summary statistics datasets for ten National Park Service National Capital Region park units and three custom areas of analysis: Catoctin Mountain Park, Chesapeake & Ohio Canal National Historical Park, George Washington Memorial Parkway, Harpers Ferry National Historical Park, Manassas National Battlefield Park, Monocacy National Battlefield, National Capital Parks - East, Prince William Forest Park, Rock Creek Park, Wolf Trap National Park for the Performing Arts, and the three custom areas of analysis - National Capital Parks - East: Oxon Cove Park, Oxon Hill Farm, Piscataway Park, National Capital Parks - East: Greenbelt Park and Baltimore-Washington Parkway, and National Capital Parks - East: DC and Suitland Parkway. The source data and land cover calculations are available for use within the National Park Service (NPS) Inventory and Monitoring Program. Land cover summary statistics datasets can be calculated for all geographic regions within the extent of the NPS; this report includes statistics calculated for the conterminous United States. The land cover summary statistics datasets are calculated from multiple sources, including Multi-Resolution Land Characteristics Consortium products in the National Land Cover Database (NLCD) and United States Geological Survey?s (USGS) Earth Resources Observation and Science (EROS) Center products in the Land Change Monitoring, Assessment, and Projection (LCMAP) raster dataset. These summary statistics calculate land cover at up to three classification scales: Level 1, modified Anderson Level 2, and Natural versus Converted land cover. The output land cover summary statistics datasets produced here for the ten National Capital Region park units and three custom areas of analysis utilize the most recent versions of the source datasets (NLCD and LCMAP). These land cover summary statistics datasets are used in the NPS Inventory and Monitoring Program, including the NPS Environmental Settings Monitoring Protocol and may be used by networks and parks for additional efforts.
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4

Toward a Global Baseline of Carbon Storage in Collective Lands: An Updated Analysis of Indigenous Peoples' and Local Communities' Contributions to Climate Change Mitigation. Rights and Resources Initiative, November 2016. http://dx.doi.org/10.53892/abqr3130.

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A new report quantifies the carbon stored aboveground in tropical forests that are legally owned or traditionally held by Indigenous Peoples and local communities in 37 countries across tropical America, Africa, and Asia. The report launches a long term collaboration among the Woods Hole Research Center, Rights and Resources Initiative, and World Resources Institute to continue tracking Indigenous Peoples’ and local communities’ role in carbon sequestration globally, with goals of adding data over time for additional countries, relevant non-forest ecosystems, and traditionally held lands that lack formal recognition. This work is a continuation of groundbreaking studies from 2014 and 2015 initiated by a dedicated group of scientific, policy, and indigenous organizations.
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