Dissertations / Theses: 'Forest conservation status'

1

David, Berliner Derek. "Systematic conservation planning and South Africa's Forest Biome: An assesment of the conservation status of South Africa's forest and reccomdentations for their conservation." Doctoral thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/6232.

Full text

Abstract:

This thesis reports on the first substantial data collation, analysis and interpretation for a systematic conservation plan for the entire South African forest biome. This was done by addressing the following questions: What is the current state of the forest biome? How well are forests protected? How threatened are they? What are the conservation priorities, and what needs to be done to improve forest conservation? The study is broad and integrative, using information from various published and unpublished sources, as well as expert judgements. The general framework of systematic conservation planning was used along with the software tools typically used for irreplacebility analysis. Rule based modelling, expert judgements and GIS modelling, were used to develop indices of threat, vulnerability, fragmentation, degradation, connectivity and irreplacebility, at the scale of forest patches, forest clusters and forest types. An index of subsistence resource use of forests was modelled using population density, extent of electrification, forest accessibility and the buffering effect of plantations and woodlots. Using these indices, priorities for conservation were identified. Species richness and numbers of red data and endemic species, were also evaluated for each forest type. Forest patches as well as forest clusters were used as planning units, while forest types were used as surrogates to represent forest biodiversity . South African forests have by far the highest number of tree species per unit area of any temperate forest in the world. A high proportion of species occurring in forests are threatened and endemic. At least 56 forest occurring vascular plants and approximately 88 forest occurring faunal species are listed as IUCN red data species. The current forest protected area network of South Africa, does not adequately protect representative samples of forest biodiversity pattern and process. Approximately 25 % of the total forested area occurs within formal statutory protected areas, but most of this is made up of just a few forest types. Of the 21 forest types assessed, six have less than 10% formal protection. Three forest types, Eastern Scarp, Pondoland Scarp and Kwazulu-Natal Dune forests stand out as being highly vulnerable to biodiversity loss, of these; Pondoland Scarp forests have the lowest level of formal protection, and the highest number of endemic species, making this forest type, the highest conservation priority in the country. 10 PhD thesis: Forest conservation planning: Derek Berliner The limitations of the mathematical selection algorithms (C-plan and MARXAN) to incorporate ecological heuristics and context specific information within reserve selection were recognised. In response to this, a rule based modelling approach was used, that enables ecological heuristics to guide the selection of priority forests, This provided pragmatic, but not necessary mathematically optimal solutions to network reserve design. The traditional (largely silvicultural) focus of forest management and reserve planning in South Africa, has tended to view forests as geographically and functionally distinct ecosystems, without adequate consideration of landscape scale processes and requirements for connectivity. For long term conservation of forest biodiversity, planning requires to occur across multiple scales, and with a broader and longer term view than what has been the traditionally focus. Forest conservation needs to involve both on, and off-reserve strategies. This should include: expansion of the formal protected area network (so as to adequately represent all forest types), improvements in management of existing reserves, and regulation of land use change within forested catchments and catchments linked to forests. This should form part of integrated land management strategy that directly involves communities in forest conservation programmes.

APA, Harvard, Vancouver, ISO, and other styles

2

Kaloki, McNichol Kitavi. "MAPPING VEGETATION STATUS AT LAKE NAKURU NATIONAL PARK AND SURROUNDS, KENYA." Miami University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami1498015331943846.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Hummel, Brittany Ann. "Seeing the Forests for the Tourists: Forest-Based Entrepreneurial Tourism Enterprises in the Northeast." Fogler Library, University of Maine, 2008. http://www.library.umaine.edu/theses/pdf/HummelBA2008.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Kruger, L. M. "Dynamics and conservation status of the Swartkransberg forests." Thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/26351.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Gagnon, Jennifer. "A Global Conservation Assessment of Temperate Forests: Status and Protection." ScholarWorks@UNO, 2003. http://scholarworks.uno.edu/td/45.

Full text

Abstract:

Global biodiversity protection requires the development of protected areas that include representative samples of different ecosystems and their associated biodiversity (Dudley 1992, Scott et al. 2001a). I compared long-term decline and protection of forests in three major biomes; boreal, temperate and tropical. I found that forests in the temperate biome are less abundant and less protected than forests in the boreal and tropical biomes. I conducted regional analyses for five continents on the degree of protection of temperate forests across naturally occurring geographic and elevational ranges. My results indicate that protected temperate forests do not represent the full geographic and elevational range of naturally occurring temperate forests. Bias in location, elevation and slope of protected areas are present at both the regional and global scale. Better protection of temperate forests is needed if the diversity and resources associated with these forests types across their geographic range is to be preserved.

APA, Harvard, Vancouver, ISO, and other styles

6

Means, Julianna Lynn. "The Role of Old Regrowth Forests for Avian Diversity Conservation in a Southwestern Ohio Landscape." Miami University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=miami1280416915.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Rembold, Katja [Verfasser]. "Conservation status of the vascular plants in East African rain forests / Katja Rembold." Koblenz : Universitätsbibliothek Koblenz, 2011. http://d-nb.info/101343739X/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Franc, Niklas. "Conservation ecology of forest invertebrates, especially saproxylic beetles, in temperate successional oak-rich stands /." Göteborg : Göteborg University, 2007. http://www.loc.gov/catdir/toc/fy0802/2007423867.html.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Franc, Niklas. "Conservation ecology of forest invertebrates, expecially saproxylic beetles, in temperate successional oak-rich stands /." Göteborg : Göteborg University, Department of Zoology, 2007. http://www.loc.gov/catdir/toc/fy0802/2007423867.html.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Schultz, Courtney Allison. "Cumulative effects analysis in U.S. Forest Service decision-making." Diss., [Missoula, Mont.] : The University of Montana, 2009. http://etd.lib.umt.edu/theses/available/etd-06102009-101714.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Rajkaran, Anusha. "A status assessment of mangrove forests in South Africa and the utilization of mangroves at Mngazana Estuary." Thesis, Nelson Mandela Metropolitan University, 2011. http://hdl.handle.net/10948/1547.

Full text

Abstract:

In South Africa mangrove forests are located in estuaries from Kosi Bay in KwaZulu-Natal (KZN) to Nahoon Estuary in the Eastern Cape. The aims of this study were to determine the present state of mangroves in KwaZulu-Natal, by assessing the current population structure, the changes in cover over time and associated anthropogenic pressures. A second objective of this study was to determine the effect of harvesting on the population structure and sediment characteristics in the Mngazana mangrove forest. To determine if harvesting was sustainable at Mngazana Estuary; the growth and mortality rates and associated growth conditions were measured. Finally by using population modelling sustainable harvesting limits were determined by predicting the change in population structure over time. The study focussed on the KwaZulu-Natal province as a fairly recent study addressed mangrove distribution and status in the Eastern Cape Province. A historical assessment of all mangroves forests in KwaZulu-Natal (KZN) revealed that the potential threats to mangroves in South Africa include; wood harvesting, altered water flow patterns coupled with salinity changes, prolonged closed-mouth conditions and subsequent changes to the intertidal habitat. As a result mangroves were completely lost from eleven estuaries in KZN between 1982 and 1999 and a further two estuaries by 2006. Mangroves only occurred in those estuaries where the mouth was open for more than 56 percent of the time with the exception of St Lucia, where the mouth has been closed for longer but the mangrove communities have persisted because the roots of the trees were not submerged. All mangrove forests in KZN were regenerating in terms of population structure as they had reverse J-shaped population curves as well as high adult: seedling ratios. Kosi Bay and Mhlathuze Estuary were two of the larger forests that showed signs of harvesting (presence of tree or branch stumps), but the greatest threat to smaller estuaries seems to be altered water flow patterns due to freshwater abstraction in the catchments and the change of land use from natural vegetation to sugar-cane plantations. These threats affect the hydrology of estuaries and the sediment characteristics (particle size, redox, pH, salinity, temperature) of the mangrove forests. The environmental conditions under which the mangrove forests currently exist were determined for five species. Lumnitzera racemosa and Ceriops tagal exhibited a narrow range of conditions as these species are only found at Kosi Bay, while Avicennia marina, Bruguiera gymnorrhiza and Rhizophora mucronata were found to exist under a wider range of conditions. The growth rate and response to environmental conditions of the three dominant species were important to determine as these species are impacted by harvesting. Mangrove growth rates were measured at Mngazana Estuary in the Eastern Cape, the third largest mangrove forest in South Africa. Areas of this estuary where mangroves harvesting has occurred, show significant differences in sediment characteristics as well as changes in population structure in harvested compared to non harvested sites. The growth rate (in terms of height) of Avicennia marina individuals increased from seedlings (0.31 cm month-1) to adults (1.2 cm month-1), while the growth of Bruguiera gymnorrhiza stabilised from a height of 150 cm at 0.65 cm month-1. The growth of Rhizophora mucronata peaked at 0.72 cm month-1 (height 151-250 cm) and then decreased to 0.4 cm month-1 for taller individuals. Increases in diameter at breast height (DBH) ranged between 0.7 and 2.3 mm month-1 for all species. Some environmental variables were found to be important drivers of growth and mortality of individuals less then 150 cm. A decrease in sediment pH significantly increased the mortality of Avicennia marina seedlings (0-50 cm) (r = - 0.71, p<0.05) and significantly decreased the growth of Rhizophora mucronata and Bruguiera gymnorrhiza seedlings (r = -0.8, r = 0.52 – p < 0.05 respectively). At Mngazana Estuary, mortality of this species showed a positive correlation with sediment moisture content indicating that this species prefers drier conditions. The density of Rhizophora mucronata was significantly correlated to porewater temperature in Northern KZN as was the growth of adult (>300 cm) Rhizophora trees at Mngazana Estuary. Mortality of Avicennia marina individuals (51-150 cm) was related to tree density indicating intraspecific competition and self thinning. Selective harvesting of particular size classes of Rhizophora mucronata was recorded when comparing length of harvested poles (~301 cm) and the size class distribution of individuals. Taking into account the differences in growth rate for each size class for this species it will take approximately 13 years to attain a height of 390 cm which is the height at which trees are selected for harvesting at this estuary. This is 2.6 times slower than those individuals growing in Kenya. The feasibility of harvesting is dependent on the growth rate of younger size classes to replace harvested trees as well as the rate of natural recruitment feeding into the population. Different harvesting intensity scenarios tested within a matrix model framework showed that limits should be set at 5 percent trees ha-1 year-1 to maintain seedling density at > 5 000 ha-1 for R. mucronata. However harvesting of Bruguiera gymnorrhiza should be stopped due to the low density of this species at Mngazana Estuary. Harvesting of the tallest trees of Avicennia marina can be maintained at levels less than 10 percent ha-1 year-1. Effective management of mangrove forests in South African is important to maintain the current state, function and diversity of these ecosystems. Management recommendations should begin with determining the freshwater requirements of the estuaries to maintain the mouth dynamics and biotic communities and deter the harvesting of (whole) adult trees particularly those species that do not coppice. Further management is needed to ensure that forests are cleared of pollutants (plastic and industrial), and any further developments near the mangroves should be minimized.

APA, Harvard, Vancouver, ISO, and other styles

12

Simek, Stephanie Lynn. "History, Status, and Resource Selection of the American Black Bear in Mississippi." Thesis, Mississippi State University, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10980505.

Full text

Abstract:

Historically, black bears occurred throughout Mississippi but by 1932, <12 bears remained. Repatriation in neighboring states and conservation efforts in Mississippi have led to the recolonization of at least 2 subspecies (U. a. luteolus and U. a. americanus) of black bears in the state. I compiled available data to provide a synthesis of the history, current status, and management of black bears in Mississippi. Additionally, I used global positioning data collected from radio collared bears to determine the influence of distance to source population, cover type, distance to roads, distance to water, wetland reserve program areas, and human population density on black bear resource selection at various spatial scales. I studied characteristics of space use and resource selection of recolonizing bears in the Mississippi Alluvial Valley (Delta). I assessed the influence of environmental parameters at the female core annual home-range (using 50% kernel density estimator) and male and female seasonal and annual home-ranges (95% kernel density estimator). Distance to source population and distance to roads had significant influence at the core female home-range scale. I found a sex-based difference in annual and seasonal home-ranges. I also found that bears exhibited response to and selection for specific resources with an affinity toward hardwood stands, particularly young-aged hardwoods. My research illustrates the importance of analyzing resource selection at multiple scales to gain a full understanding of parameters that influence the recolonization of a bear population.

APA, Harvard, Vancouver, ISO, and other styles

13

Weeks, Dane. "PLANT PEST QUARANTINE SURVEY INTERNSHIP WITH THEUNITED STATES DEPARTMENT OF AGRICULTURE." Miami University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami1500722486282801.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Bakhtiari, Fatemeh. "Revealing components of the economic value for environmental goods and services from forest : an application of stated preference methods for forest valuation and conservation." Thesis, Bangor University, 2014. https://research.bangor.ac.uk/portal/en/theses/revealing-components-of-the-economic-value-for-environmental-goods-and-services-from-forest--an-application-of-stated-preference-methods-for-forest-valuation-and-conservation(362a2aff-fa8f-466d-a05e-0d1368b24c20).html.

Full text

Abstract:

The overall purpose and contribution of this thesis is increasing the understanding of components of the value of environmental goods. It investigates how the public perceive environmental goods (lay people's perception) and the elements of it that they value. Providing such knowledge contributes to improving valuation methods e.g. the use of the Choice Experiment (CE) for valuing forest biodiversity conservation. Increasing knowledge oflay people's perception and mental constructs of environmental goods can help researchers to know how they can present environmental goods in CEs which align with respondents' perceptions and to further understand the appropriate way of measuring these values. To fulfill the aim of the thesis, the broadleaved forests in southem Scandinavia were chosen as a case study area where both qualitative and quantitative methods were applied to increase understanding of lay people's perception of forest environmental goods and services and to use this for improving stated preference valuation methods. The thesis includes two parts. The first is an introduction to the overall framework of the thesis, an overview of the objectives and an explanation of the main theories behind the CE method. The second part includes four papers. The first two papers mostly focus on improving methodological aspects of CEs, while the next two papers use the result of a CE to generate a better and more comprehensive information base for policy formulation and decision making procedures. The first paper provides input for the three other papers which investigate lay people's perceptions and mental constructs of concepts of nature, forest envirOlID1ental goods and services. The results contribute to the research field by illustrating that 'diversity of animals and plants', 'natural appearance and dynamics of ecosystem', and 'peace and quiet' are the most preferred attributes of forest ecosystems which were most frequently mentioned by lay people compared with other attributes of forest ecosystems. In addition, it was found that regardless of familiarity with the various ecological scientific telminologies, lay people had an intuitive understanding of ecological concepts such as biodiversity. The analyses demonstrate that respondents' perceptions and values of biodiversity could be framed in two categories: as a good in itself, and for its regulatory function. It was also revealed that attitudes to forest and its biodiversity may be rooted in respondents' mental constructs. This can be useful in targeting policies conceming conservation management. The second paper applies these insights from the qualitative investigation of nature perception to estimate WTP for forest biodiversity conservation.

APA, Harvard, Vancouver, ISO, and other styles

15

Lazdinis, Marius. "Connecting social and ecological systems : towards an integrated toolbox for assessment of forest policy implementation /." Uppsala : Dept. of Conservation Biology, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/s315.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Rashid, Kadhim. "Effekten av naturvärdesgynnande åtgärder på fågelfaunan : En vinterfågelinventering i Tjäderbergets mångfaldspark." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-172016.

Full text

Abstract:

Increasingly homogenous forest landscapes, with fewer occurrences of wildfires, deciduous trees and dying, decaying wood has led to fewer appropriate habitats and feeding opportunities for several forest dwelling species, including birds. This study sought to assess the species richness, diversity, and evenness of winterbirds in forest stands where conservation methods (planting of alder trees, free development, burning of forest stands and promotion of deciduous dominance) have been applied, as well as a managed stand of lodgepole pine (Pinus contorta), within SCA:s Tjäderbergets diversity park. These stands were compared with managed stands of Scots pine (Pinus sylvestris). Bird species composition was collected by performing regular 25-minute inventories in each stand type at 5 time periods daily over a 6-day period in late March, 2020. Significant differences in species richness was discovered between a stand of free development and the managed stands as well as a stand treated for deciduous dominance and the managed stands. There were no significant differences with regard to neither species diversity between the observed stand types, nor the presence of specialists or generalists. Evenness between the stand types showed little variation. These results may be due to the overall low number of unique species and individuals in each stand type which likely resulted from low statistical power of the statistical tests. Further research into the effects of conservation measures in forests stands on bird fauna are needed to obtain conclusive results on how conservation measures affect local bird assemblages.

APA, Harvard, Vancouver, ISO, and other styles

17

Miller, Gilbert David. "Scientists, Uncertainty and Nature, An Analysis of the Development, Implementation and Unintended Consequences of the Northwest Forest Plan." Thesis, Portland State University, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=13807499.

Full text

Abstract:

The conflict in the Pacific Northwest between competing visions of how federal forests should be managed resulted in a political stalemate in the early 1990s. The Northwest Forest Plan (NWFP) was initiated to resolve the demands for maintaining ecosystem processes and biological diversity with the social and economic needs for timber harvest. The foundation for the plan rested with the development of ecosystem management. The intent of this research is to explore the events which led up to the adoption of the NWFP, how it was implemented by the US Forest Service and Bureau of Land Management and the subsequent reactions to and consequences of the plan.

The primary research consisted of thirty-eight semi-structured interviews with individuals responsible for the development of the initial plan, those tasked with implementing the plan and current federal agency personnel from the land management agencies and regulatory agencies. With the use of thematic analysis, key meanings were captured as expressed by the interviewees. The data was analyzed using institutional theory, capturing the organizational relations within the organizational field of the land management agencies.

Research findings suggest that the NWFP was unsuccessful in meeting the goal of addressing the social and economic issues as well as the goals for ecosystem management. This dissertation explores the organizational practices and cultural meanings that led to the final instantiation of the plan. It seeks to shed light on the reasons why these goals were not met and how future forest plans can move beyond the current stalemate between conservation and preservation.

APA, Harvard, Vancouver, ISO, and other styles

18

Hazell, Per. "Conservation and yield aspects of old European aspen Populus tremula L. in Swedish forestry /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5636-3.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

West, Emily Ruth. "BLM Land Use Planning in Western Oregon: A Case Study for Integrating Public Participation in Natural Resources Planning." The University of Montana, 2007. http://etd.lib.umt.edu/theses/available/etd-05302007-073835/.

Full text

Abstract:

Public participation can fundamentally improve natural resources planning and decision-making. On an ad hoc basis, it has been shown that public participation improves the durability and sustainability of plans and decisions; it increases the technical, consensus-building, and decision-making capacity of the public; it increases levels of trust; and it improves relationships between agency personnel and members of the public. Despite the proliferation of these new tools and strategies and their successful implementation, innovative and inclusive public participation methods have still not become widely integrated into the natural resources planning and administrative decision-making processes of federal agencies. Utilizing the Bureau of Land Management's Western Oregon Plan Revision process as a case study, this paper considers barriers to the regular inclusion of innovative and inclusive public participation methods in agency's planning and decision-making processes and provides some prescriptions for overcoming those barriers. Through analysis of this case study, I identify eight potential roadblocks to integrating innovative forms of public participation in natural resources planning and decision-making, including: 1) political context, 2) the purpose and need of the planning effort, 3) false expectations for public involvement, 4) geographic scope of the planning area, 5) the plan timeline, 6) federal budgetary pressure, 7) agency culture and individual attitudes towards public participation, and 8) the limitations of leadership

APA, Harvard, Vancouver, ISO, and other styles

20

Pavlák, Jakub. "Přehled a vyhodnocení dostupných databází při oceňování trvalých porostů." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-232516.

Full text

Abstract:

The subject of this master´s thesis is evaluation availability databases sources used in forensic engineering of forest management. Theoretical part describes basic terms about forests, forest management and available databases sources. Practical part deals with describing of this databases and make methods, how can we get useful information.

APA, Harvard, Vancouver, ISO, and other styles

21

Semizer, Cuming Devrim [Verfasser], Reiner [Akademischer Betreuer] Finkeldey, Oliver [Gutachter] Gailing, and Kurt [Gutachter] Weising. "Gene flow from planted common ash (Fraxinus excelsior L.) stands to old-growth forests – implications for conservation and use of genetic resources affected by ash dieback / Devrim Semizer Cuming ; Gutachter: Oliver Gailing, Kurt Weising ; Betreuer: Reiner Finkeldey." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2018. http://d-nb.info/1173975039/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Portillo, Carlos Alonso. "Assessing the conservation status of neotropical dry forests using geographical information systems and optical remote sensing." 2010. http://hdl.handle.net/10048/1083.

Full text

Abstract:

Thesis (Ph.D.)--University of Alberta, 2010.
Title from PDF file main screen (viewed on July 13, 2010). A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta. Includes bibliographical references.

APA, Harvard, Vancouver, ISO, and other styles

23

Kaetzel, Brandon Russell. "Landowner decisions and motivations on the Tennessee northern Cumberland Plateau willingness to participate in government assistance programs and reasons for owning woodland /." 2008. http://etd.utk.edu/August2008MastersTheses/KaetzelBrandonRussell.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Gagnon, Jennifer Beth. "A global conservation assessment of temperate forests status and protection /." 2003. http://louisdl.louislibraries.org/u?/NOD,62.

Full text

Abstract:

Thesis (M.A.)--University of New Orleans, 2003.
Title from electronic submission form. "A thesis ... in partial fulfillment of the requirements for the degree of Master of Arts in the Department of Geography"--Thesis t.p. Vita. Includes bibliographical references.

APA, Harvard, Vancouver, ISO, and other styles

25

Portillo, Carlos. "Assessing the Conservation status of Neotropical Dry forests using Geographic Information Systems and Optical Remote Sensing." Phd thesis, 2010. http://hdl.handle.net/10048/1083.

Full text

Abstract:

Planet Earth is undergoing a rapid rate of ecosystem conversion and degradation and one of the major challenges of current environmental science is to contribute to the management and conservation of biodiversity through the development of tools for assessing environmental change. The main goal of this doctoral dissertation is to contribute to the scientific literature on remote sensing tools for monitoring tropical dry forests, which is one of most important global change frontiers. This thesis is composed of five chapters which have the goals of covering the following specific goals: 1) To estimate the extent and geographic distribution of the neotropical dry forest. 2) To evaluate the potential use of satellite-detected fires as deforestation predictors in tropical dry forest and 3) To evaluate the potential of remote sensing techniques to detect edge effects in tropical dry forest. Before assessing the main goals of the thesis, in chapter two, Integrating Remote Sensing and Biodiversity research, we stress out the necessity of integrated assessments using multiple spatial and spectral resolution sensors over a wide array of ecosystems in order to find relevant ecosystem properties that would be sensitive to species richness. Chapter three, Extent and Conservation of tropical dry forests in the Americas, describes a regional scale mapping effort using coarse-scale imagery (MODIS 500-m) of the extent and geographical distribution of tropical dry forests that introduces several innovations to previous assessments. Based on these techniques, the total current extent of tropical dry forest in the Americas is 519,597 Km2. I also found that 66% of the ecosystem has been already converted to other land uses while only 4.5 % of is under protected areas. Chapter four, MODIS Active fires and deforestation in tropical dry forest landscapes, we show correlations patterns between the number of MODIS Active Fires and forest cover change in four tropical dry forest landscapes in Latin America. At the Santa Cruz site (Bolivia), correlations were strong and significant while at Chamela Site (Mexico) and the Mata Seca site (Brazil) correlations were moderate but significant as well. In the Machango site (Venezuela), active fires showed no correlation to deforestation events. In general, our findings show that fires detected by the MODIS sensor may be used as predictors of deforestation in tropical dry forest ecosystems. Chapter five, Edge influence on canopy openness and understory microclimate in two Neotropical dry forest fragments, addresses one of the most characteristic features of fragmented tropical forests: the increase in disturbance near the edges of the fragment or what is known as edge effects. Results in gap fraction and Fraction of Intercepted Photosynthetically Active Radiation (FiPAR) show that edge influence at tropical dry forest sites extend to at least 300-m. Finally, Chapter Six, Remote sensing of edge effects in dry forest fragments using CHRIS/Proba Imagery, shows an assessment of changes in the fraction of intercepted photosynthetically active radiation (FiPAR) across four edge-to-interior transects in tropical dry forests fragments and their correlation to spectral vegetation indices (SVIs) computed from the hyperspectral and multiangular CHRIS sensor on board the Proba platform. Results show that the use of spectral vegetation indices for identifying and quantifying edge effects in tropical forests have the potential to improve modeling of forest disturbance in fragmented landscapes. The work contained in these five chapters address issues that are critical to the advancement of tropical dry forest monitoring. These studies contribute to the current scientific literature on the use and application of optical remote sensing tools, not only applicable in tropical dry forests, but for tropical forest conservation at the continental, regional and local level.

APA, Harvard, Vancouver, ISO, and other styles

26

Semizer, Cuming Devrim. "Gene flow from planted common ash (Fraxinus excelsior L.) stands to old-growth forests – implications for conservation and use of genetic resources affected by ash dieback." Thesis, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E540-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Pearson, Alexander Svend. "North American wood supply and demand : is there enough?" 2009. http://hdl.handle.net/2429/16124.

Full text

Abstract:

The North American forest industry has long been an important part of North America’s economy. The industry has traditionally been the only industrial demand on timberland creating a long established balance between the supply (timberland) and the demand (manufacturing). Recently the forest industry has been troubled due to the collapse of the solid wood products largest market, housing, and a global recession. These troubled times have lead many operation in the industry to curtail operations. Since the industry curtailed, high oil prices and increasing environmental concern have advocated the investment in renewable energy sources. As a renewable energy source, biomass holds great potential for satisfying a portion of our continental energy demands. This increased demand for timberland products could be very profitable to the timberland owners but also holds many concerns to the extent of additional supply that can be harvested from our timberlands. Further complicating the balance of supply and demand are the large global and domestic effects that are reducing the total amount of timberland and increasing the demand for the remaining timberlands. The supply and demand changes have the potential to make the forest industry evermore important part of the North American economy but care must be taken to not over extend our resources.

APA, Harvard, Vancouver, ISO, and other styles

28

Gorrín, Manzuli Arnélida. "Wissensgestütztes Beobachtungs- und Evaluierungssystem der Landnutzung." Doctoral thesis, 2005. http://hdl.handle.net/11858/00-1735-0000-0006-B337-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic 'Forest conservation status'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles