Browsing by Author "Swenson, Jennifer J"
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Item Open Access A CASE STUDY ON BUILDING ENERGY EFFICIENCY MEASURES AT W.E. HUNT RECREATION CENTER, TOWN OF HOLLY SPRINGS(2021-12-04) Tan, Hui ChienThe Town of Holly Springs, located in Wake County of North Carolina, is interested in improving energy efficiency in municipal operations and facilities to offset increasing energy consumption and utility costs that are a substantial contributor to the Town’s budget. The purpose of this Master’s Project is twofold: a) to examine energy use in the Town; and b) to explore passive energy efficiency measures, particularly tree shade effect on annual energy consumption, for the most energy-intensive building owned by the Town. Quantifying the energy conservation benefits of trees in the urban environment adds value municipal tree planting efforts. This study utilized the eQuest energy simulation software to evaluate a series of proposed energy efficiency measures (EEM) on consumption and financial savings. The study concluded with recommendations on which EEMs to pursue based on savings generated.Item Open Access A Comparison of Remote Sensing Methods for Estimating Above-Ground Carbon Biomass at a Wetland Restoration Area in the Southeastern Coastal Plain(2012-04-19) Riegel, BenDeveloping accurate but inexpensive methods for estimating above-ground carbon biomass is an important technical challenge that must be overcome before a carbon offset market can be successfully implemented. Previous studies have shown that full-waveform LiDAR (light detection and ranging) is well suited for modeling above-ground biomass in mature forests; however, there has been little previous research on the ability of discrete-return LiDAR to model above-ground biomass in areas with relatively sparse vegetation. This study compared the abilities of discrete-return LiDAR and high-resolution optical imagery to model above-ground carbon biomass at a wetland restoration area in eastern North Carolina. The optical imagery model explained more of the overall variation in biomass at the study site than the LiDAR model did (R2 values of 0.36 and 0.19 respectively). Moreover, the optical imagery model was better able to detect high and low biomass areas than the LiDAR model. These results suggest that the ability of discrete-return LiDAR to model above-ground biomass is rather limited in areas with relatively small trees and that high spatial resolution optical imagery may be the better tool in such areas.Item Open Access A comparison of three methods to estimate evapotranspiration in two contrasting loblolly pine plantations: Age-related changes in water use and drought sensitivity of evapotranspiration components(Forest Science, 2012-10-02) Domec, Jean-Christophe; Sun, Ge; Noormets, Asko; Gavazzi, Michael J; Treasure, Emrys A; Cohen, Erika; Swenson, Jennifer J; McNulty, Steve G; King, John SIncreasing variability of rainfall patterns requires detailed understanding of the pathways of water loss from ecosystems to optimize carbon uptake and management choices. In the current study we characterized the usability of three alternative methods of different rigor for quantifying stand-level evapotranspiration (ET), partitioned ET into tree transpiration (T), understory transpiration, interception, and soil evaporation (E S) and determined their sensitivity to drought, and evaluated the reliability of soil moisture measurements by taking into account deep soil moisture dynamic. The analyses were conducted in an early- and in a mid-rotation stand of loblolly pine, the predominant species of southern US forest plantations. The three alternative methods for estimating ET were the eddy covariance measurements of water vapor fluxes (ET EC), the water table fluctuation (ET WT), and the soil moisture fluctuation (ET SM). On annual and monthly scales, the three methods agreed to within 10-20%, whereas on a daily scale, the values of ET SM and ET EC differed by up to 50% and ET SM and ET WT differed by up to 100%. The differences between the methods were attributed to root water extraction below measurement depth and to the sampling at different spatial scales. Regardless of the method used, ET at the early-rotation site was 15-30% lower than that at the mid-rotation site. The dry years did not affect ET at the mid-rotation site but reduced significantly ET at the early-rotation site. Soil moisture trends revealed the importance of measuring water content at several depths throughout the rooting zone because less than 20% of the water is stored in the top 30 cm of soil. Annually, E S represented approximately 9 and 14% of ET EC at the mid-rotation site and the early-rotation site, respectively. At the mid-rotation site, T accounted for approximately 70% of ET EC. Canopy interception was estimated to be 5-10% of annual precipitation and 6-13% of total ET EC. At the early-rotation site, T accounted for only 35% of ET EC. At this site, transpiration from subdominant trees and shrubs represented 40-45% of ET EC, indicating that understory was a significant part of the water budget. We concluded that the eddy covariance method is best for estimating ET at the fine temporal scale (i.e., daily), but other soil moisture and water table-based methods were equally reliable and cost-effective for quantifying seasonal ET dynamics.© 2012 by the Society of American Foresters.Item Open Access A Qualitative Characterization of Spring Vegetation Phenology Using MODIS Imagery for the Piedmont of North Carolina from 2000 to 2007(2008-08-29T15:23:52Z) Bausch, Adam J.Recent studies have shown vegetation phenology around the world is being altered by increased variability in temperatures associated with a warming climate. The onset of spring and the duration of the growing season in many eastern states has been pushed forward an average of 2-5 days and lengthened by as much as 10-15 days respectively, as a response to climatic forcing. Analyzing phenological changes to forest dynamics is aided by the use of satellite imagery with high temporal and spatial resolution to accurately estimate the timing of recurrent events associated with the flush of green vegetation at the beginning of spring in deciduous forests. This study used daily MODIS images at 250m processed to Normalized Difference in Vegetation Index (NDVI) for the spring greenup from 2000-2003 and 2007. Of the 792 available images, 20 sites along the Piedmont, coastal plain, and mountains of North Carolina were filtered (a lowpass Savitsky-Golay convolution filter) to remove atmospheric noise, and used to estimate relevant phenological parameters. Onset of spring, length of growing season, rate of green-up, as well as, maximum green-up, were identified using a segmented regression technique. Over the study period, the Piedmont sites exhibited high variability in dates of onset among sites ( 5days) and negatively between years (6 days), with concurrent variability in growing season length. Furthermore, using the NDVI response in regressions of climate variables at the AmeriFLUX site in Duke Forest from 2001-2003, showed growing degree-days since last freeze and mean soil temperature as most significantly in agreement with phenological change. Future studies should focus on acquiring daily satellite imagery to monitor the changes and variability seen among sites and years with careful attention given to severe weather anomalies. Creating maps of relevant climatic variables may provide a more accurate means of predicting phenology and determining the influence of site-specific environmental variables.Item Open Access Agricultural Drivers of Land Use Change in Paraguay(2017-04-28) Larsen, JanetIn recent years, Paraguay has become one of the top five countries with the highest acceleration in deforestation rates. Between 2000 and 2015, Paraguay lost 20 percent of its tree-covered area. The two main drivers of deforestation in Paraguay are land clearing for cattle pastures and for soybean farms. Agriculture and ranching are encroaching on the country’s unique ecosystems, including the Gran Chaco in the West and Paraguay’s remaining portions of the biodiverse Atlantic forest in the East. This study presents a statistical and spatial analysis of Paraguay’s changing land use patterns. It also examines the policies and voluntary agreements affecting land use. Results indicate a strong correlation between expanding soybean farms in Paraguay’s Eastern Region and expanding cattle herds in the Western Region. Both soybean land area and cattle herd size are strongly correlated with deforestation. Growing demand for both beef and soybeans on international markets are likely to increase pressures on Paraguay’s remaining forests. Existing policies are insufficient to curb deforestation.Item Open Access American chestnut (Castanea dentata) habitat modeling: identifying suitable sites for restoration in Shenandoah National Park, Virginia(2013-12-06) Santoro, JenniferSince 2008, The American Chestnut Foundation’s (TACF) Appalachian Trail MEGA-Transect Project has engaged citizen scientists to collect American chestnut occurrence data over the length of the Appalachian Trail. This data helps TACF to locate surviving trees for use in their breeding program and expand their knowledge of chestnuts across the East Coast. However, this dataset is limiting in that it considers only the ridge-top habitat of the trail. To remedy this, we conducted an extensive sampling of side-trails in Shenandoah National Park in order to study more diverse elevation and habitat gradients. Expanding the dataset allows us to draw more informed conclusions about habitat for surviving American chestnuts. To achieve this, I developed a series of species distribution models, including GLM, CART, and Maxent models, based on field observations and spatial data of environmental variables. These predictive distribution models were then combined to generate a comprehensive map of the most likely surviving American chestnut occurrence locations across Shenandoah National Park. Additionally, projections based on future climate were made for the Maxent model to 2050 and 2070 in order to see if habitat for surviving trees might shift in the face of climate warming. Overall, the three species distribution modeling techniques tended to agree on location, but not quantity, of suitable habitat for surviving chestnuts. All models found elevation, sand, and slope to be the most significant habitat predictors in Shenandoah. Climate change models produced only subtle range shifts; as a generalist species, American chestnuts may not face adverse effects of future climate warming. Mapping these results provides valuable information to both Shenandoah National Park and TACF as they continue to search for, study, and restore American chestnuts in the Appalachian forest.Item Open Access An Analysis of Erosion and Sedimentation Programs in North Carolina(2010-04-30T15:03:13Z) Stogner, MichelleSedimentation is considered to be the number one pollutant of North Carolina waters. When excessive sediments enter the water, normally as a result of construction or agriculture, severe ecological consequences occur. Soil particles can transport chemical pollutants, increase turbidity and decrease the quality of receiving waters. In North Carolina there are 53 local (county or city) Erosion and Sedimentation Control (E&SC) Programs that have the authority to approve E&SC Plans for construction activities within their own jurisdictional boundaries. This Masters Project evaluated 24 E&SC programs by examining their Ordinances and comparing them with the model ordinance drafted by Department of Environment and Natural Resources. In addition, I organized and analyzed local program data that was collected from the 24 programs through a survey as part of the Muddy Waters Watch Program, an Environmental Protection Agency Section 319 grant project. The data extracted was on buffer widths, staff, active construction sites, notices of violations, limit of site exposure and graded slopes and fills. In order to assess the importance of these regulations, I conducted a riparian buffer analysis on the French Broad River using the National Land Cover Dataset Change Product for 1992 to 2001. The results indicate that the number of staff and their qualifications varied among the programs. On average, each active construction site was inspected once a week, and in some situations once every two weeks. The ordinance analysis showed that while each program has the model ordinance as a reference, each is unique to their area. However, certain aspects of the model ordinance, such as exposure and slopes, should be modified for different North Carolina regions. The French Broad River buffer analysis demonstrated the importance for adequate buffer regulations. While the amount of change was small, the change that did occur was classified as buffering land types (forest and grasslands) to pollutant land types (urban, industrial and agriculture). The French Broad River has the least stringent buffer regulations, the most active construction sites and the steepest slopes. Areas such as this are more prone to sediment pollution and thus should have wider buffer widths.Item Open Access AN ANALYSIS OF LANDSCAPE CHARACTERISTICS INFLUENCING LIVESTOCK DEPREDATION BY LIONS, HYENAS, AND LEOPARDS IN LOIBOR SIRET, TANZANIA(2012-04-30) Baraso, SamThe African lion has declined precipitously across its entire range from nearly 500,000 in the early 1900s to roughly 35,000 individuals today. While a multitude of factors contributes to the lions’ decline, conflict with traditional pastoralists is one of the gravest threats. Lions, hyenas and leopards opportunistically prey on livestock including cattle, donkeys, goats, and sheep in pastoral regimes. However, lions are disproportionately blamed for livestock depredation and are common targets in retaliatory killings in many communities. Several NGOs including the African People & Wildlife Fund are finding ways to minimize predation incidences and thereby reduce retaliatory killings. Strategies such as corral fortification have reduced predation events within the homestead, however, a significant percentage of attacks are at the pasture. Using 54 months of carnivore/livestock conflict data in the Maasai Steppe of Tanzania, I assess the influence of landscape features to characterize the risk of predation at the pasture. By identifying factors contributing to greater predation risk, strategies to mitigate attacks at pasture can be designed. This way, herders will have greater capacity to protect their primary source of wealth and can better co-exist with predators. I found that proximity to bomas (corrals) is the most relevant landscape feature explaining the likelihood of attack across all three carnivores. After accounting for boma proximity, no other variable contributes a significant explanatory role, and attacks cannot be accounted for by landscape features alone. Fifty-three percent of all pasture predation occurs at night. Of these, roughly 71% occur on lost livestock. This study suggests that “lost livestock” represents an area of further research. After, the initiation of the Living Walls corral fortification program, boma predation declined by over ninety percent. Pasture predation also declines, though the causal mechanism is unclear. This study shows that environmental characteristics may be less important than social or behavioral characteristics of the herders in determining livestock predation at pasture.Item Open Access Analysis of aboveground carbon for indigenous communities in Oaxaca, MX(2021-12-08) Harrigan, EliseManaging forests for carbon is a productive and sustainable way to provide conservation and economic and ecological value. Oaxaca, the most biologically diverse state in Mexico, located in the southwestern region of the country, is looking to expand carbon offset opportunities on indigenous lands. The client for this project, a Oaxacan-based NGO, Integrator Campesino and Indigenous Communities of Oaxaca (ICICO), is working in conjunction with indigenous communities, to manage and protect natural resources while providing sustainable livelihood opportunities. Carbon offset programs are emerging as a promising method in conserving the forests’ biodiversity, while still providing monetary value to the local people by selling credits on the carbon market. This project aims to (1) evaluate the current methodologies and allometric equations in use to calculate the aboveground carbon in the forest, (2) analyze if the current aboveground biomass map accurately depicts the carbon distribution across the state, and (3) identify future carbon offset project locations across the communally owned lands. As forests continue to be at risk of deforestation, the importance of creating community-based conservation opportunities is increasingly more valuable.Item Open Access ANALYZING LANDSCAPE CONNECTIVITY FOR FELIDAE IN OAXACA GIVEN CURRENT AND POTENTIAL COMMUNITY LAND USE TRENDS(2021-04-30) Meca van den Berg, ClaudiaOaxaca state in southern Mexico lies adjacent to the Mesoamerican biological corridor and is comprised of a uniquely diverse landscape. It is further home to many indigenous peoples who possess autonomy and communal land rights. Tropical and deciduous forest ecosystems are essential to maintain landscape connectivity, and are becoming increasingly threatened by agricultural expansion, land privatization and urbanization. Suitable habitat within the range of the jaguar, Panthera onca, and other Felidae species is increasingly fragmented. Indigenous and rural community land management may play an important role in habitat integrity through mixed-use and traditional agroecological practices. This study examines the current distribution of key felid species and analyzes potential scenarios of land use change which may affect future fragmentation. Current land use and connectivity is modeled at both the state scale and for regional areas of interest. Scenario-based models are further used to help explore landscape connectivity in Oaxaca, through the relationship between land cover change, land use and presence of wildlife. Increased understanding of landscape connectivity for felids may inform future management of habitat conservation and restoration at various levels.Item Open Access ASSESSING RIPARIAN CONDITION AND PRIORITIZING LOCATIONS FOR STREAMSIDE REFORESTATION PROJECTS: NORTHERN MANABÍ PROVINCE, ECUADOR(2013-04-26) Jolley, JeremiahRiparian corridors perform ecological functions to a degree that vastly exceeds their spatial area on the landscape. These unique ecotones decrease sedimentation, provide unique wildlife habitat, help attenuate flood waters, and improve stream water quality by regulating and absorbing nutrient and pollutant flows across system boundaries. However, human actions at the landscape scale are a primary threat to the integrity of river ecosystems. This project focuses on maximizing ecological benefits through effective riparian restoration planning within one of the world’s most threatened biodiversity hotspots: the coastal semi-deciduous, tropical dry forests of northwestern Ecuador. In order to meet the restoration objectives in a cost-effective manner, satellite remote sensing and geospatial modeling were employed to (a) understand relationships between land use/land cover (LULC) and drinking water quality across four watersheds of varying sizes and levels of forest-to-pasture conversion; (b) accurately identify potential restoration sites along important riparian corridors; and (c) prioritize and recommend restoration sites using a rank system that focuses on restoration feasibility and the potential to improve water quality, hydrologic functioning, and wildlife habitat. Within the four coastal watersheds in the study area, the severity of deforestation ranges from 24% to 50% mainly due to conversion to pasture for livestock production. This type of land use change further increases by as much as 10% for areas closest to higher order streams showing an increased threat to riparian zones. The substantial loss of riparian forest cover led to the identification of 1,668 potential restoration sites, with an average size of 0.2 ha. Of these potential sites, 3.8% ranked as “high” priority, 47.6% ranked as “moderate” priority and 48.6% ranked as “low” priority. Those sites that are ranked the highest priority for reforestation efforts are larger in size, maximize core-area/edge ratios for prospective wildlife habitat improvements, and have the best potential to enhance riparian buffer functioning once restored.Item Open Access Assessing the effects of urbanization on land use land cover changes and land surface temperatures in Sejong, South Korea(2022-04-22) Choi, Eun Hye (Grace)Urban heat islands (UHI) result from replacing natural landscapes with dense concentrations of pavement and other surfaces that absorb and retain heat, resulting in greater temperatures than outlying rural areas and a negative influence on people's health. Sejong, with its fast and high-density urbanization, presents itself as a useful case for examining the UHI effect in a newly built city. With countries increasingly relocating cities and administrative centers, whether due to pollution, over-population, or flooding risk, it is crucial to understand the experiences of nations that have completed the shift, allowing the formulation of suitable policy measures for smarter and more sustainable development. Thus, this research examines the effects of land-use/land-cover (LULC) changes on land surface temperatures (LSTs) over a 12-year timespan for a capital city built from the ground up using Landsat 5, 8, and MODIS remotely-sensed imagery. To observe correlations between land-use percentage coverage and surface temperatures, the LST and land-use classification mapping for the full study area is derived from Landsat imagery in summer dates of 2004, 2009, 2013, and 2020. This study also explores the relationship between increased LST intensity and urban growth, as well as changes in greenness (NDVI: Normalized Difference Vegetation Index) as a result of translating MODIS' monthly raster values into a time series for a number of different places that have undergone both more and no urbanization. Furthermore, the current study aims to determine changes of LULC and their impacts on the UHI intensity in different urban areas by using LST data collected in 2020 and linking it to indices that mark different urban features. LSTs of different LULC were analyzed both during the daytime and nighttime using ECOSTRESS. The findings for LULC analysis show that the amount of built-up area increased considerably from 2004 to 2020 (34%). In addition, the LULC analysis results demonstrate that the urban expansion witnessed in Sejong was due to the conversion of agricultural land (-43%) to built-up land. From 2004 to 2020, LST ranges were 21-34°C in 2004, 24-39°C in 2009, 16-40°C in 2013, and 23-47°C in 2020, indicating a significantly increasing trend. In addition, between 2004 and 2020 there was an increase in study area mean LST from 25.69°C to 35.89°C. Overall, a correlation between the greatest LST increases and increased land development was observed, while the lowest LST represented non changing vegetation cover. Additionally, the LST maps reveal that high LST values are concentrated in the most populous towns of Sejong. It was found that typical LSTs for the populous towns range between 30 to 43° C for the summer months in 2020. The mean NDVI for the non-changing rural and urban conversion areas was 0.5 and 0.24, respectively. The gradient of UHI intensity analysis indicates that urban areas experienced a 1.92°C higher LST on average compared to rural areas. The strongest UHI demonstrated a 3.38°C higher LST and -0.449 lower NDVI compared to the rural areas. According to the Kendall correlation test, the UHI and NDVI differences have a negative correlation of 0.55 (Kendall correlation test). The time of day exhibited different effects of ECOSTRESS-derived LST depending on different land features. Lastly, the mean LST results in 2020 indicate that urban heat island intensity varied among cities with very similar NDVI results.Item Open Access Characterizing Spatial Pattern and Heterogeneity of Pine Forests in North Carolina’s Coastal Plain using LiDAR(2009-04-24T18:49:24Z) Smart, Lindsey S.Remote sensing tools that directly characterize canopy structure would be beneficial for management activities and conservation planning. LiDAR (Light Detection And Ranging) is such a tool, as an active remote sensing technology that provides fine-grained information about the three-dimensional structure of ecosystems across a broad spatial extent. This project assesses the feasibility of using the state-wide North Carolina Floodplain Mapping LiDAR dataset to differentiate between the structural components of evergreen forest types in North Carolina’s coastal plain. Vertical structure and spatial patterns of vertical structure were quantified using geospatial measures such as semivariogram/ correlograms, lacunarity analysis, and correlation length. LiDAR-derived metrics were also created for comparison with standard field-based measurements of stand structure. I found that LiDAR is capable of measuring canopy variation and can differentiate between the structural characteristics of evergreen forest types. Also, the N.C. LiDAR has potential for use as a surrogate for field measurements when collection is not feasible due to time, labor, or financial constraints. In addition, the project examined LiDAR’s use as a screening tool in the identification of suitable habitat for the federally endangered red-cockaded woodpecker (Picoides borealis). I used Maximum Entropy (Maxent), an inductive modeling algorithm for presence data only, to create a spatial species distribution model using LiDAR-derived variables in addition to more typical geospatial variables. The Area (AUC) under the Receiver Operating Characteristic (ROC) curve was analyzed for increases in predictive power with additions of variables. Results suggested that the addition of LiDAR-derived variables to habitat models improved their predictive power, resulting in a test AUC increase from 0.923 with standard spatial variables only, to a test AUC of 0.951 with LiDAR-derived variables added. The success of this project has important implications for natural resource management and conservation planning, especially given that the LiDAR dataset is publicly available and covers the entire state of North Carolina.Item Open Access Co-occurring woody species have diverse hydraulic strategies and mortality rates during an extreme drought.(Plant Cell Environ, 2018-03) Johnson, Daniel M; Domec, Jean-Christophe; Carter Berry, Z; Schwantes, Amanda M; McCulloh, Katherine A; Woodruff, David R; Wayne Polley, H; Wortemann, Remí; Swenson, Jennifer J; Scott Mackay, D; McDowell, Nate G; Jackson, Robert BFrom 2011 to 2013, Texas experienced its worst drought in recorded history. This event provided a unique natural experiment to assess species-specific responses to extreme drought and mortality of four co-occurring woody species: Quercus fusiformis, Diospyros texana, Prosopis glandulosa, and Juniperus ashei. We examined hypothesized mechanisms that could promote these species' diverse mortality patterns using postdrought measurements on surviving trees coupled to retrospective process modelling. The species exhibited a wide range of gas exchange responses, hydraulic strategies, and mortality rates. Multiple proposed indices of mortality mechanisms were inconsistent with the observed mortality patterns across species, including measures of the degree of iso/anisohydry, photosynthesis, carbohydrate depletion, and hydraulic safety margins. Large losses of spring and summer whole-tree conductance (driven by belowground losses of conductance) and shallower rooting depths were associated with species that exhibited greater mortality. Based on this retrospective analysis, we suggest that species more vulnerable to drought were more likely to have succumbed to hydraulic failure belowground.Item Open Access Community-based forestry in Kalimantan: An assessment of authority, policy, and capacity(2009-08-28T18:18:06Z) Rosenbarger, AnneWith the largest remaining area of forest in Indonesia, the region of Kalimantan claims hundreds of rare and endemic species, numerous forest-dependent communities, as well as rates of deforestation that have risen to among the highest in the world. As such, the region is a crucial area in which to address sustainable forest management. This paper explores the current state and future potential of community-based forestry management (CBFM) in Kalimantan. Specifically, I explored three factors affecting the state of CBFM in the area –decentralization reform (reformasi), national social forestry policy, and capacity-building organizations .A review of current policy and literature revealed that decentralization and community forestry policies in Indonesia have progressed in terms of granting local governments a greater share of resource revenues and in acknowledging the concept of community participation in resource management. However, the central government has failed to devolve the majority of authority over state lands, which compose the vast majority of Indonesia’s forest resources. Additionally, policies still lack provisions for secure access to and control of resources by local communities. As such, the national community forestry policy cannot truly be labeled a “community-based” program, and must still undergo significant reform in order to successfully integrate with existing, locally-based CBFM programs.
"Capacity-building organizations” help to improve the necessary capacities required by communities to successfully implement CBFM projects. I identified 97 organizations operating in Kalimantan, finding the greatest concentration in the province of West Kalimantan. The most common organizational focus was ‘sustainable development and resource management’ and the most widely practiced activities were advocacy, research, and training – with variations occurring between operational scales. I found a dramatic increase in organization establishment during the last decade, particularly in Kalimantan-based organizations and peaking during years coinciding with initial decentralization reforms. Based on my analysis, I concluded that future efforts by organizations should concentrate on increasing representation in the provinces of East and South Kalimantan, as well as in individual districts across all four provinces; on making the issue of conservation a central focus for a greater number of organizations; and on improving interorganizational communication.
Item Open Access Connecting People with Nature Through a Network of Large Natural Areas(2015-04-23) Plechaty, Dan; Norten, WilliamThe South Atlantic region, extending from southern Virginia to northern Florida, is a diverse and growing area that includes large urban centers such as Atlanta, Jacksonville, Charlotte and Raleigh. With a large number of the region’s population already residing in these metropolitan areas, the percentage urban residents in South Atlantic’s population is expected to increase rapidly over the next few decades. The pressures from this expanding urbanization will result in the further loss of natural areas unless proactive land conservation actions are undertaken. As it stands, not all of these urban residents currently have access to a large natural area in which to recreate and enjoy nature, making timely conservation efforts in the region vital. It is against this background that the South Atlantic Landscape Conservation Cooperative (SALCC) is working to “inform resource management decisions” and facilitate conservation planning among “federal agencies, regional organizations, states, tribes, NGOs, universities and other entities” in the region. The goal of this project is to work with the SALCC to perform a feasibility analysis for having a large natural area nearby every urban resident in the South Atlantic region. To accomplish this, we performed a literature review in order to determine how much people value large natural areas and how willing they are to travel to reach them. Then, we developed a novel, flexible and scalable geospatial toolset which calculates two measures of access: Euclidean distance and driving times. Finally, we employed an exploratory statistical analysis to see how access correlates with socio-economic, geographic and other variables. It is our hope that our work will both help the SALCC identify areas in need of future conservation efforts and inform them about what is valued in a large natural area and what groups’ needs in the region are currently not being met.Item Open Access Conservation of Marojejy National Park: Lemur Population Surveys and Habitat Disturbance Assessments with Remote Sensing(2013-04) Moore, JenniferMarojejy National Park is among the most biologically diverse protected areas in Madagascar. This unique mountainous park is home to eleven lemur species including the critically endangered silky sifaka (Propithecus candidus). However, due to lack of data and surveys for these species, there is a lack of knowledge as to the geographic range, elevation restrictions and density of each species. Additionally, habitat disturbances and forest conversion has not been characterized within the park and its surroundings. To begin to fill this gap, diurnal and nocturnal line-transect surveys were conducted across two regions within the park (north and central) in order to characterize lemur population abundance, habitat structure and disturbance; encounter rates and density were calculated for all species. To characterize regional disturbances, high resolution Geo-Eye and IKONOS GEO satellite imagery was processed to map land cover and human disturbances. From the field surveys I found a relatively higher density of strictly diurnal or primarily diurnal lemurs in the central region, and a higher density of nocturnal lemurs in the north region. These differences found could be a result of the transects surveyed in terms of elevation, amount of protection within the region of the park, frequency of foot traffic from tourist or guides, or differences in the number of predators or other species present. Anthropogenic disturbance was clearly higher in the north and included selective logging, old rosewood logs, lemur/carnivore traps, bush-huts, and extraction of wild tubers. These results highlight areas of the park requiring more protection, while providing some of the first lemur encounter rates and densities from this national park.Item Open Access Designing A Biological Corridor in Oaxaca, Mexico(2020-04-24) Erdman, Krista; Myers, Kimberly; Patterson, Virginia; Wang, ZifengSituated in the biodiversity hotspot of Oaxaca, San Juan Lachao and San Pedro Juchatengo boast an impressive collection of faunal species. Protecting these animals is critical to both prevent extinction and support the communities’ cultures and economies. In our study, we focused on six species – white-tailed deer, jaguarundi, ocelot, puma, peccary, and coati – to locate potential conservation areas and generate a corridor to connect them. Using camera trap observations collected by community members, remotely sensed data, and information gathered in the field, we employed statistical models to map the distribution of each focal species based on probability of occurrence. We then prioritized conservation areas by selecting sizable regions with overlapping distributions. Finally, we calculated least cost paths to find an optimal corridor site. To facilitate future studies, we also classified a highly accurate land use land cover map for the region. Our results identified two priority conservation areas in Lachao totaling 2,774 ha. In future studies, we recommend adjusting the camera trap protocol to extend into Juchatengo and focus on potential conservation areas that have not yet been observed. Additional environmental variables collected at the camera trap sites would also likely markedly improve our distribution models. For indigenous communities that rely on their collective lands for living, biological diversity is an essential aspect of their management practices and is integral to their livelihoods and cultural values. Livelihood activities by indigenous communities also have important implications on local biodiversity both as a source of stress and as a potential force of environmental stewardship. Alternative livelihood projects (ALPs) refer to conservation interventions that intend to reduce people’s reliance on threatened natural resources,generate economic benefits and increase local support for conservation. ICICO has actively promoted ALPs in the two agrarian communities that we worked with, San Juan Lachao and San Pedro Juchatengo, as a strategy for integrating biodiversity and socioeconomic goals. In this part of our project, we studied the socioeconomic effects of the proposed biological corridor and explored the potential for alternative livelihood projects in the client communities. We conducted 18 semi-structured interviews with leaders from Lachao and Juchatento, to determine perceptions of benefits and barriers regarding ALP’s and a proposed biological corridor connecting the two communities. We spent time with community members in the field to build trust and gather supporting data from conversations regarding the project. Then, we conducted an in-depth literature review of case studies of four types of alternative livelihood projects identified by ICICO as being of particular interest and relevance for these communities: forest-based carbon offset, non-timber forest product, agroforestry and ecotourism. From the review of literature, we drew lessons that can inform the development of projects in our client communities. Integrating the coding and data analyses from the interviews and the literature review, we determined recommendations towards implementing ALP’s and conservation activities that will link the communities and support the corridor.Item Open Access Drone Use in Forestry 2021(2021-12-08) McElwee, ElisabethIn the last 20 years, advancements in technology, such as remote sensing, have facilitated improvements in forest management. The utilization of one remote sensing tool, in particular, an unmanned aerial vehicle (drone), has been gaining popularity in recent years. Drones provide an inexpensive alternative to aerial photos from a manned aircraft, providing quick access to high-resolution imagery, increased efficiency, reduced human risk, as well as a variety of other benefits. While there are many advantages to the use of drones in forestry and forest management, there are also limitations. These limitations are apparent when trying to apply methodologies across varying terrains, species compositions, and economic scales. Nevertheless, more people in forestry are beginning to explore the use of drones in forest management. In order to gain insight into the status and limitations of drone use in forest management in 2021, a nationwide survey targeted to those in forest management was developed and distributed. Ultimately the goal of this study is to provide a baseline for understanding how this technology is currently being used in forest management and to identify areas for improvement that may lead to greater utilization.Item Open Access Duke Forest Carbon(2011-12-09) Downing, Eric; Fulton, Erin; Strauss, JoshuaDuke University is dedicated to achieving climate neutrality by 2024. With over 7000 acres of sustainably managed forest land, the Duke Forest has great potential for generating “in house” carbon offsets to help reach this goal. In this project we quantified the carbon represented in Duke’s forest holdings and analyzed the potential for generating emissions-reducing offsets based on Climate Action Reserve (CAR) and American Carbon Registry (ACR) protocols. Throughout the process we focused on three varieties of forest offsets: Avoided Conversion, Improved Forest Management, and Afforestation/Reforestation, comparing the relative advantages and disadvantages of each under CAR and ACR carbon accounting systems. After completing these carbon calculations we conducted a financial analysis of our results in order to make recommendations to the Duke Carbon Offsets Initiative concerning how they might apply these forest offsets toward the university’s carbon neutrality goal. Ultimately we concluded that the Duke Forest has the potential to produce significant amounts of high quality carbon offsets at a cost considerably below that of purchasing them on the voluntary market. The generation of Improved Forest Management offsets under CAR protocols proved particularly compatible with current Duke Forest management practices, yielding substantial carbon and financial benefits with minimal project development investment. Based on the results of our carbon and financial models we determined that the Duke Forest could generate 358,109 offset credits over the next 50 years, saving the university over $1.5 million.