Project: NET PRIMARY PRODUCTIVITY (NPP)Project: NET PRIMARY PRODUCTIVITY (NPP)
NPP (net primary production) data from existing field measurements are being compiled for approximately 100 study sites covering several major world ecosystem types. These data are used by global change modelers to develop and validate models of vegetation-soil-atmosphere interactions within the global carbon cycle and to help calibrate remote sensing of vegetation worldwide
Data Set: Walker Branch Watershed Vegetation Inventory, 1967-1997Data Set: Walker Branch Watershed Vegetation Inventory, 1967-1997
The original objectives of the long-term vegetation survey of Walker Branch Watershed in eastern Tennessee (WBW; Curlin and Nelson 1968) was to quantify the standing crop of vegetation through time including measures of tree/plant size distribution, species composition, above-ground biomass, and chemical balance. Field studies of permanent vegetation plots using one sample design were conducted over a 30-year period (1967 to 1997), and observations continue with funding from the U.S. Department of Energy's Program for Ecosystem Research. This data set consists of long-term measurements of diameter at breast height (DBH) determined on randomly located permanent inventory plots within the 4 different vegetation types located on WBW in 1967. In addition, the lignin to nitrogen content in leaves (g lignin / g N of leaf tissue) for species present in WBW was obtained from the literature. More information can be found at: http://walkerbranch.ornl.gov/. Funding for long-term data collection efforts on Walker Branch was provided by the U.S. Department of Energy (DOE), Office of Science, Biological and Environmental Research (BER), as a part of the Program for Ecosystem Research (PER).
Detailed Documentation: Data Set Reference Document
Huston, M.A., D.W. Johnson, D.E. Todd, J.W. Curlin, and F.W. Harris. 2005. Walker Branch Watershed Vegetation Inventory, 1967-1997. Data set. Available on-line [http://daac.ornl.gov/] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/819
Data Set Files:Download Data Set Files: (7.8 MBytes in 4 Files)
All Data Taken At Latitude: 35.90N, Longitude: 84.30W
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