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Nutrient Regulation Of Organic Matter Decomposition In A Tropical Rain Forest, Cory C. Cleveland, Sasha C. Reed, Alan R. Townsend
Nutrient Regulation Of Organic Matter Decomposition In A Tropical Rain Forest, Cory C. Cleveland, Sasha C. Reed, Alan R. Townsend
Ecosystem and Conservation Sciences Faculty Publications
errestrial biosphere–atmosphere CO2 exchange is dominated by tropical forests, so understanding how nutrient availability affects carbon (C) decomposition in these ecosystems is central to predicting the global C cycle's response to environmental change. In tropical rain forests, phosphorus (P) limitation of primary production and decomposition is believed to be widespread, but direct evidence is rare. We assessed the effects of nitrogen (N) and P fertilization on litter-layer organic matter decomposition in two neighboring tropical rain forests in southwest Costa Rica that are similar in most ways, but that differ in soil P availability. The sites contain 100–200 tree species …
3-Pg Productivity Modeling Of Regenerating Amazon Forests: Climate Sensitivity And Comparison With Modis-Derived Npp, Joseph D. White, Neal A. Scott, Adam I. Hirsch, Steven W. Running
3-Pg Productivity Modeling Of Regenerating Amazon Forests: Climate Sensitivity And Comparison With Modis-Derived Npp, Joseph D. White, Neal A. Scott, Adam I. Hirsch, Steven W. Running
Ecosystem and Conservation Sciences Faculty Publications
Potential forest growth predicted by the Physiological Principles in Predicting Growth (3-PG) model was compared for forest and deforested areas in the Legal Amazon to assess potential differing regeneration associated with climate. Historical deforestation and regeneration have occurred in environmentally marginal areas that influence regional carbon sequestration estimates. Effects of El Niño–induced drought further reduce simulated production by decreasing soil water availability in areas with shallow soils and high transpiration potential. The model was calibrated through comparison of literature biomass and with satellite-based estimates. Net primary productivity (NPP) for mature Amazonian forests from the 3-PG model was positively correlated ( …
Estimation Of Incident Photosynthetically Active Radiation From Moderate Resolution Imaging Spectrometer Data, Shunlin Liang, Tao Zheng, Ronggao Liu, Hongliang Fang, Si-Chee Tsay, Steven W. Running
Estimation Of Incident Photosynthetically Active Radiation From Moderate Resolution Imaging Spectrometer Data, Shunlin Liang, Tao Zheng, Ronggao Liu, Hongliang Fang, Si-Chee Tsay, Steven W. Running
Ecosystem and Conservation Sciences Faculty Publications
Incident photosynthetically active radiation (PAR) is a key variable needed by almost all terrestrial ecosystem models. Unfortunately, the current incident PAR products estimated from remotely sensed data at spatial and temporal resolutions are not sufficient for carbon cycle modeling and various applications. In this study, the authors develop a new method based on the look-up table approach for estimating instantaneous incident PAR from the polar-orbiting Moderate Resolution Imaging Spectrometer (MODIS) data. Since the top-of-atmosphere (TOA) radiance depends on both surface reflectance and atmospheric properties that largely determine the incident PAR, our first step is to estimate surface reflectance. The approach …
Sensitivity Of Moderate Resolution Imaging Spectroradiometer (Modis) Terrestrial Primary Production To The Accuracy Of Meteorological Reanalyses, Maosheng Zhao, Steven W. Running, Ramakrishna R. Nemani
Sensitivity Of Moderate Resolution Imaging Spectroradiometer (Modis) Terrestrial Primary Production To The Accuracy Of Meteorological Reanalyses, Maosheng Zhao, Steven W. Running, Ramakrishna R. Nemani
Ecosystem and Conservation Sciences Faculty Publications
The Moderate Resolution Imaging Spectroradiometer (MODIS) on board NASA's satellites, Terra and Aqua, dramatically improves our ability to accurately and continuously monitor the terrestrial biosphere. MODIS information is used to estimate global terrestrial primary production weekly and annually in near-real time at a 1-km resolution. MODIS terrestrial primary production requires daily gridded assimilation meteorological data as inputs, and the accuracy of the existing meteorological reanalysis data sets show marked differences both spatially and temporally. This study compares surface meteorological data sets from three well-documented global reanalyses, NASA Data Assimilation Office (DAO), European Centre for Medium-Range Weather Forecasts (ECMWF) (ERA-40) and …