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Articles 1 - 4 of 4
Full-Text Articles in Ecology and Evolutionary Biology
Biogeochemical Consequences Of Rapid Microbial Turnover And Seasonal Succession In Soil, S. K. Schmidt, E. K. Costello, D. R. Nemergut, Cory C. Cleveland, S. C. Reed, M. N. Weintraub, A. F. Meyer, A. M. Martin
Biogeochemical Consequences Of Rapid Microbial Turnover And Seasonal Succession In Soil, S. K. Schmidt, E. K. Costello, D. R. Nemergut, Cory C. Cleveland, S. C. Reed, M. N. Weintraub, A. F. Meyer, A. M. Martin
Ecosystem and Conservation Sciences Faculty Publications
Soil microbial communities have the metabolic and genetic capability to adapt to changing environmental conditions on very short time scales. In this paper we combine biogeochemical and molecular approaches to reveal this potential, showing that microbial biomass can turn over on time scales of days to months in soil, resulting in a succession of microbial communities over the course of a year. This new understanding of the year-round turnover and succession of microbial communities allows us for the first time to propose a temporally explicit N cycle that provides mechanistic hypotheses to explain both the loss and retention of dissolved …
Controls Over Foliar N:P Ratios In Tropical Rain Forests, Alan R. Townsend, Cory C. Cleveland, Gregory P. Asner, Mercedes M. C. Bustamante
Controls Over Foliar N:P Ratios In Tropical Rain Forests, Alan R. Townsend, Cory C. Cleveland, Gregory P. Asner, Mercedes M. C. Bustamante
Ecosystem and Conservation Sciences Faculty Publications
Correlations between foliar nutrient concentrations and soil nutrient availability have been found in multiple ecosystems. These relationships have led to the use of foliar nutrients as an index of nutrient status and to the prediction of broadscale patterns in ecosystem processes. More recently, a growing interest in ecological stoichiometry has fueled multiple analyses of foliar nitrogen : phosphorus (N:P) ratios within and across ecosystems. These studies have observed that N:P values are generally elevated in tropical forests when compared to higher latitude ecosystems, adding weight to a common belief that tropical forests are generally N rich and P poor. However, …
A New Satellite-Based Methodology For Continental-Scale Disturbance Detection, David J. Mildrexler, Maosheng Zhao, Faith Ann Heinsch, Steven W. Running
A New Satellite-Based Methodology For Continental-Scale Disturbance Detection, David J. Mildrexler, Maosheng Zhao, Faith Ann Heinsch, Steven W. Running
Ecosystem and Conservation Sciences Faculty Publications
The timing, location, and magnitude of major disturbance events are currently major uncertainties in the global carbon cycle. Accurate information on the location, spatial extent, and duration of disturbance at the continental scale is needed to evaluate the ecosystem impacts of land cover changes due to wildfire, insect epidemics, flooding, climate change, and human-triggered land use. This paper describes an algorithm developed to serve as an automated, economical, systematic disturbance detection index for global application using Moderate Resolution Imaging Spectroradiometer (MODIS)/Aqua Land Surface Temperature (LST) and Terra/MODIS Enhanced Vegetation Index (EVI) data from 2003 to 2004. The algorithm is based …
Sensitivity Of Pan-Arctic Terrestrial Net Primary Productivity Simulations To Daily Surface Meterology From Ncep-Ncar And Era-40 Reanalyses, Ke Zhang, John S. Kimball, Maosheng Zhao, Walter C. Oechel, John Cassano, Steven W. Running
Sensitivity Of Pan-Arctic Terrestrial Net Primary Productivity Simulations To Daily Surface Meterology From Ncep-Ncar And Era-40 Reanalyses, Ke Zhang, John S. Kimball, Maosheng Zhao, Walter C. Oechel, John Cassano, Steven W. Running
Ecosystem and Conservation Sciences Faculty Publications
We applied a terrestrial net primary production (NPP) model driven by satellite remote sensing observations of vegetation properties and daily surface meteorology from the 45-year ECMWF Re-Analysis (ERA-40) and the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP-NCAR) reanalysis (NNR) to assess NPP spatial and temporal variability for the pan-Arctic basin and Alaska from 1982 to 2000. Sensitivity analysis of the production efficiency model (PEM) to uncertainties in surface meteorological inputs indicate that ERA-40 solar radiation and NNR solar radiation and surface temperatures are the primary sources of PEM-based NPP uncertainty for the region. Considerable positive bias in …