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Articles 1 - 9 of 9
Full-Text Articles in Physical Sciences and Mathematics
Effects Of 11 Years Of Co2 Enrichment On Root Biomass And Spatial Distribution In A Florida Scrub-Oak Ecosystem, Rachel Eilenfield Schroeder
Effects Of 11 Years Of Co2 Enrichment On Root Biomass And Spatial Distribution In A Florida Scrub-Oak Ecosystem, Rachel Eilenfield Schroeder
Biological Sciences Theses & Dissertations
A Florida (USA) scrub-oak ecosystem was exposed to elevated atmospheric CO2 in open-top chambers from 1996-2007. Minirhizotrons and ground-penetrating radar (GPR) were used to measure fine root (< 2 mm diameter) and coarse root (> 5 mm diameter) biomass, respectively. After 11 years of CO2 enrichment, there was a trend of greater total root biomass under elevated CO2. Fine root biomass exhibited a pattern of recovery and steady state throughout the study, with significant CO2 stimulation observed only after disturbance. Greater root biomass under elevated CO2 during recovery periods could result in greater carbon inputs belowground, alteration of the soil carbon …
Effects Of Species, Water, And Nitrogen On Competition Among Three Prairie Grasses, Jerry L. Weatherford, Randall W. Myster
Effects Of Species, Water, And Nitrogen On Competition Among Three Prairie Grasses, Jerry L. Weatherford, Randall W. Myster
The Prairie Naturalist
We conducted an experiment to investigate effects of species, water (W), and nitrogen (N) on competition among little bluestem (Schizachyrium scoparium), sideoats grama (Bouteloua curtipendula), and indiangrass (Sorghastrum nutans). All biomass parameters and the root:shoot ratio of little bluestem were reduced by the presence off 1 of 2 other species, and its shoot biomass and total biomass were both increased by addition of N. Root and shoot biomass of sideoats grama were reduced by the presence of indiangrass and its total biomass was reduced by the presence of itself, whereas its shoot biomass was increased by addition of W at …
Global Human Footprint On The Linkage Between Biodiversity And Ecosystem Functioning In Reef Fishes, Camilo Mora, Octavio Aburto-Oropeza, Arturo Ayala Bocos, Paula M. Ayotte, Stuart Banks, Andrew G. Bauman, Maria Beger, Sandra Bessudo, David J. Booth, Eran Brokovich, Andrew Brooks, Pascale Chabanet, Josh Eli Cinner, Jorge Cortes, Juan J. Cruz-Motta, Amilcar Cupul Magaña, Edward E. Demartini, Graham J. Edgar, David A. Feary, Sebastian C. A. Ferse, Alan M. Friedlander, Kevin J. Gaston, Charlotte Gough, Nicholas A. J. Graham, Alison Green, Hector M. Guzman, Marah Hardt, Michel Kulbicki, Yves Letourneur, Andres López Pérez, Michel Loreau, Yossi Loya, Camilo Martinez, Ismael Mascareñas-Osorio, Tau Morove, Marc-Olivier Nadon, Yohei Nakamura, Gustavo Paredes, Nicholas V.C. Polunin, Morgan S. Pratchett, Hector Reyes Bonilla, Fernando Rivera, Enric Sala, Stuart A. Sandin, German Soler, Rick Stuart-Smith, Emmanuel Tessier, Derek P. Tittensor, Mark Tupper, Paolo Usseglio, Laurent Vigliola, Laurent Wantiez, Ivor D. Williams, Shaun K. Wilson, Fernando A. Zapata
Global Human Footprint On The Linkage Between Biodiversity And Ecosystem Functioning In Reef Fishes, Camilo Mora, Octavio Aburto-Oropeza, Arturo Ayala Bocos, Paula M. Ayotte, Stuart Banks, Andrew G. Bauman, Maria Beger, Sandra Bessudo, David J. Booth, Eran Brokovich, Andrew Brooks, Pascale Chabanet, Josh Eli Cinner, Jorge Cortes, Juan J. Cruz-Motta, Amilcar Cupul Magaña, Edward E. Demartini, Graham J. Edgar, David A. Feary, Sebastian C. A. Ferse, Alan M. Friedlander, Kevin J. Gaston, Charlotte Gough, Nicholas A. J. Graham, Alison Green, Hector M. Guzman, Marah Hardt, Michel Kulbicki, Yves Letourneur, Andres López Pérez, Michel Loreau, Yossi Loya, Camilo Martinez, Ismael Mascareñas-Osorio, Tau Morove, Marc-Olivier Nadon, Yohei Nakamura, Gustavo Paredes, Nicholas V.C. Polunin, Morgan S. Pratchett, Hector Reyes Bonilla, Fernando Rivera, Enric Sala, Stuart A. Sandin, German Soler, Rick Stuart-Smith, Emmanuel Tessier, Derek P. Tittensor, Mark Tupper, Paolo Usseglio, Laurent Vigliola, Laurent Wantiez, Ivor D. Williams, Shaun K. Wilson, Fernando A. Zapata
Marine & Environmental Sciences Faculty Articles
Difficulties in scaling up theoretical and experimental results have raised controversy over the consequences of biodiversity loss for the functioning of natural ecosystems. Using a global survey of reef fish assemblages, we show that in contrast to previous theoretical and experimental studies, ecosystem functioning (as measured by standing biomass) scales in a non-saturating manner with biodiversity (as measured by species and functional richness) in this ecosystem. Our field study also shows a significant and negative interaction between human population density and biodiversity on ecosystem functioning (i.e., for the same human density there were larger reductions in standing biomass at more …
Forest Structure And Aboveground Biomass In The Southwestern United States From Modis And Misr, Mark Chopping, Crystal B. Schaaf, Feng Zhao, Anne W. Nolin, Gretchen G. Moisen, John V. Martonchik, Michael Bull
Forest Structure And Aboveground Biomass In The Southwestern United States From Modis And Misr, Mark Chopping, Crystal B. Schaaf, Feng Zhao, Anne W. Nolin, Gretchen G. Moisen, John V. Martonchik, Michael Bull
United States National Aeronautics and Space Administration: Publications
Red band bidirectional reflectance factor data from the NASA MODerate resolution Imaging Spectroradiometer (MODIS) acquired over the southwestern United States were interpreted through a simple geometric–optical (GO) canopy reflectance model to provide maps of fractional crown cover (dimensionless), mean canopy height (m), and aboveground woody biomass (Mg ha−1) on a 250 m grid. Model adjustment was performed after dynamic injection of a background contribution predicted via the kernel weights of a bidirectional reflectance distribution function (BRDF) model. Accuracy was assessed with respect to similar maps obtained with data from the NASA Multiangle Imaging Spectroradiometer (MISR) and to contemporaneous …
Characterizing 3d Vegetation Structure From Space: Mission Requirements, Forrest G. Hall, Kathleen Bergen, James B. Blair, Ralph Dubayah, Richard Houghton, George Hurtt, Josef Kellndorfer, Michael Lefsky, Jon Ranson, Sassan Saatchi, H.H. Shugart, Diane Wickland
Characterizing 3d Vegetation Structure From Space: Mission Requirements, Forrest G. Hall, Kathleen Bergen, James B. Blair, Ralph Dubayah, Richard Houghton, George Hurtt, Josef Kellndorfer, Michael Lefsky, Jon Ranson, Sassan Saatchi, H.H. Shugart, Diane Wickland
United States National Aeronautics and Space Administration: Publications
Human and natural forces are rapidly modifying the global distribution and structure of terrestrial ecosystems on which all of life depends, altering the global carbon cycle, affecting our climate now and for the foreseeable future, causing steep reductions in species diversity, and endangering Earth's sustainability. To understand changes and trends in terrestrial ecosystems and their functioning as carbon sources and sinks, and to characterize the impact of their changes on climate, habitat and biodiversity, new space assets are urgently needed to produce high spatial resolution global maps of the three-dimensional (3D) structure of vegetation, its biomass above ground, the carbon …
Mapping Biomass And Stress In The Sierra Nevada Using Lidar And Hyperspectral Data Fusion, Anu Swatantran, Ralph Dubayah, Dar A. Roberts, Michelle Hofton, J. Bryan Blair
Mapping Biomass And Stress In The Sierra Nevada Using Lidar And Hyperspectral Data Fusion, Anu Swatantran, Ralph Dubayah, Dar A. Roberts, Michelle Hofton, J. Bryan Blair
United States National Aeronautics and Space Administration: Publications
In this paper, we explored fusion of structural metrics from the Laser Vegetation Imaging Sensor (LVIS) and spectral characteristics from the Airborne Visible Infrared Imaging Spectrometer (AVIRIS) for biomass estimation in the Sierra Nevada. In addition, we combined the two sensors to map species-specific biomass and stress at landscape scale. Multiple endmember spectral mixture analysis (MESMA) was used to classify vegetation from AVIRIS images and obtain sub-pixel fractions of green vegetation, non-photosynthetic vegetation, soil, and shade. LVIS metrics, AVIRIS spectral indices, and MESMA fractions were compared with field measures of biomass using linear and stepwise regressions at stand (1 ha) …
Retrieval Of Canopy Height Using Moderate-Resolution Imaging Spectroradiometer (Modis) Data, Zhuosen Wang, Crystal B. Schaaf, Philip Lewis, Yuri Knyazikhin, Mitchell A. Schull, Alan H. Strahler, Tian Yao, Ranga B. Myneni, Mark J. Chopping, Bryan J. Blair
Retrieval Of Canopy Height Using Moderate-Resolution Imaging Spectroradiometer (Modis) Data, Zhuosen Wang, Crystal B. Schaaf, Philip Lewis, Yuri Knyazikhin, Mitchell A. Schull, Alan H. Strahler, Tian Yao, Ranga B. Myneni, Mark J. Chopping, Bryan J. Blair
United States National Aeronautics and Space Administration: Publications
In this study we use the 500 m Moderate Resolution Imaging Spectroradiometer (MODIS) Bidirectional Reflectance Distribution Function (BRDF) product to develop multivariate linear regression models that estimate canopy heights over study sites at Howland Forest, Maine, Harvard Forest, Massachusetts and La Selva Forest, Costa Rica using (1) directional escape probabilities that are spectrally independent and (2) the directional spectral reflectances used to derive the directional escape probabilities. These measures of canopy architecture are compared with canopy height information retrieved from the airborne Laser Vegetation Imaging Sensor (LVIS). Both the escape probability and the directional reflectance approaches achieve good results, with …
Effects Of Aging On Organic Aerosol From Open Biomass Burning Smoke In Aircraft And Laboratory Studies, M J. Cubison, A M. Ortega, P L. Hayes, D K. Farmer, D Day, M J. Lechner, W H. Brune, E Apel, G S. Diskin, J A. Fisher, H E. Fuelberg, A Hecobian, D J. Knapp, T Mikoviny, D Riemer, G W. Sachse, W Sessions, R Weber, A J. Weinheimer, A Wisthaler, J L. Jimenez
Effects Of Aging On Organic Aerosol From Open Biomass Burning Smoke In Aircraft And Laboratory Studies, M J. Cubison, A M. Ortega, P L. Hayes, D K. Farmer, D Day, M J. Lechner, W H. Brune, E Apel, G S. Diskin, J A. Fisher, H E. Fuelberg, A Hecobian, D J. Knapp, T Mikoviny, D Riemer, G W. Sachse, W Sessions, R Weber, A J. Weinheimer, A Wisthaler, J L. Jimenez
Faculty of Science - Papers (Archive)
Biomass burning (BB) is a large source of primary and secondary organic aerosols (POA and SOA). This study addresses the physical and chemical evolution of BB organic aerosols. Firstly, the evolution and lifetime of BB POA and SOA signatures observed with the Aerodyne Aerosol Mass Spectrometer are investigated, focusing on measurements at high-latitudes acquired during the 2008 NASA ARCTAS mission, in comparison to data from other field studies and from laboratory aging experiments. The parameter f60 , the ratio of the integrated signal at m/z 60 to the total signal in the organic component mass spectrum, is used as a …
Small And Medium Enterprise Agricultural Producers And Forest Landowners Attitudes And Perceptions Towards New Bio-Based Paths To Prosperity: A Pilot Study In Louisiana And Mississippi, Roger D. Smithhart
LSU Master's Theses
Energy producers, developers, legislators, policy makers, and the public are searching for alternative energy sources to alleviate energy demands and dependency on fossil fuels. Of the renewable energy sources, biomass from forestry, crop, and animal residues offer a clean and sustainable solution to help mitigate climate issues and stabilize energy needs. However, most forests and farms in the U.S. are privately owned. It’s important to understand forest landowners’, agricultural producers’, and poultry producers’ attitudes and perceptions towards management activities intended for producing bio-based products. Three surveys were conducted tailored for each group. We surveyed 3,500 small to medium forest landowners …