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Full-Text Articles in Physical Sciences and Mathematics
Quantifying The Carbon Stored And Sequestered By The Trees On Pomona College’S Campus, Paola A. Giron-Carson
Quantifying The Carbon Stored And Sequestered By The Trees On Pomona College’S Campus, Paola A. Giron-Carson
Scripps Senior Theses
We are experiencing a climate crisis that must be confronted with strategic mitigation. Pomona College contributes to the climate crisis through its emissions for which there is a baseline record. However there is no baseline record of the climate mitigation currently performed by the trees on Pomona’s campus through carbon storage. This study seeks to determine a current baseline quantity of carbon stored and sequestrated by Pomona’s trees as well as possible courses of climate mitigation for Pomona College to take. Initial information gathering was conducted through interviews with several stakeholders. This study was conducted using data collected prior to …
Pasture Biomass Estimation Using Crop Surface Modeling And Vegetation Indices, Brendan Macinnis
Pasture Biomass Estimation Using Crop Surface Modeling And Vegetation Indices, Brendan Macinnis
All Theses
Biomass estimations are a critical function of any grazing or haylage system. Determination of ideal harvesting or grazing times help optimize the quality and quantity of above-ground biomass (AGB). The objective of this study was to evaluate the use of unmanned aerial vehicles (UAVs) for Alfalfa and Tall Fescue biomass estimations. Using a DJI Mavic Pro, RGB and NDVI images were taken and used to create orthomosaic images. Structure-from-motion (SfM) techniques were used to developed digital elevation models to evaluate the change in canopy height (∆H) between pre- and post-harvests. Change in canopy height (∆H) was shown to provide the …
Decay Of Woody Residues As The Counterfactual Treatment To Mobilization For Bioelectricity Generation, Max A. Blasdel
Decay Of Woody Residues As The Counterfactual Treatment To Mobilization For Bioelectricity Generation, Max A. Blasdel
Cal Poly Humboldt theses and projects
Decay of woody debris is a major carbon flux for forests. Decay processes are not well documented in forest modeling frameworks but play an important role in forest carbon cycling and life cycle assessments of forest-derived products. The main drivers of decay are species, vertical location, and climate. A database of literature values for decay by tree species was created to parameterize a larger model of California forestland carbon cycling. A novel methodology was applied to vary these decay values for each species spatially based on climatic drivers of decay. This resulted in decay values for each species and size …
Production And Economic Analyses Of Woody Biomass Utilization For Energy, John Edward Vance
Production And Economic Analyses Of Woody Biomass Utilization For Energy, John Edward Vance
Graduate Theses, Dissertations, and Problem Reports
A mechanized harvest system combined with whole-tree chipper producing mixed hardwood chips was investigated on two harvesting sites in the central Appalachian region, USA. Production and machine rate data of the operations were collected through time-motion study, with chipping time elements categorized into feeding, chipping, and loading. Chipping cycles averaged 21.5 minutes to produce 23.54 green tons per truckload, providing an hourly rate of 65.82 green tons/PMH (41.1 dry tons) by the whole-tree chipper. Total cycle time including truck delivery averaged 183 minutes, giving an hourly rate of 7.7 green tons/PMH (4.8 dry tons/PMH). The hourly cost of the harvesting …
Methods For The Spatial Modeling Of Forest Carbon In The Northern Forest, Alison Adams
Methods For The Spatial Modeling Of Forest Carbon In The Northern Forest, Alison Adams
Graduate College Dissertations and Theses
The ability to accurately assess forest carbon storage is critical to understanding global carbon cycles and the effects of changes in land cover on ecological processes. However, existing methods for calculating carbon storage do not explicitly account for differences in carbon stored by different species of trees. Those methods that do reflect some of this variability, such as remotely-sensing canopy structure to estimate biomass, can be resource-intensive and difficult to reproduce over past or future time steps in order to assess change. I examined the accuracy of several carbon mapping approaches to understand how specificity of forest type classification (for …
Application Of An Imputation Method For Geospatial Inventory Of Forest Structural Attributes Across Multiple Spatial Scales In The Lake States, U.S.A., Ram K. Deo
Dissertations, Master's Theses and Master's Reports - Open
Credible spatial information characterizing the structure and site quality of forests is critical to sustainable forest management and planning, especially given the increasing demands and threats to forest products and services. Forest managers and planners are required to evaluate forest conditions over a broad range of scales, contingent on operational or reporting requirements. Traditionally, forest inventory estimates are generated via a design-based approach that involves generalizing sample plot measurements to characterize an unknown population across a larger area of interest. However, field plot measurements are costly and as a consequence spatial coverage is limited. Remote sensing technologies have shown remarkable …