By T.G. Huntington,1 J.W. Harden,2 S.M. Dabney,3 D.A. Marion,4 C. Alonso,3 J.M. Sharpe,2 and T.L. Fries2
1998
1U.S. Geological Survey, 3039 Amwiler Rd. Ste. 130, Atlanta, GA, 30360.
2U.S. Geological Survey, 345 Middlefield Rd., Menlo Park, CA, 94025.
3U.S. Department of Agriculture, Agricultural Research Service, National Sedimentation
Laboratory, 598 McElroy Dr., Oxford, MS, 38655.
4U.S. Forest Service, Center For Bottomlands Hardwood Research, Front St., Oxford,
MS, 38655.
Measurements including soil respiration, soil moisture, soil temperature, and carbon export in suspended sediments from small watersheds were recorded at several field sites in northwestern Mississippi in support of hillslope process studies associated with the U.S. Geological Surveyıs Mississippi Basin Carbon Project (MBCP). These measurements were made to provide information about carbon cycling in agricultural and forest ecosystems to understand the potential role of erosion and deposition in the sequestration of soil organic carbon in upland soils. The question of whether soil erosion and burial constitutes an important net sink of atmospheric carbon dioxide is one hypothesis that the MBCP is evaluating to better understand carbon cycling and climate change. This report contains discussion of methods used and presents data for the period December 1996 through March 1998. Included in the report are ancillary data provided by the U.S. Department of Agriculture (USDA) ARS National Sedimentation Laboratory and U.S. Forest Service (USFS) Center for Bottomland Hardwoods Research on rainfall, runoff, sediment yield, forest biomass and grain yield. Together with the data collected by the USGS these data permit the construction of carbon budgets and the calibration of models of soil organic matter dynamics and sediment transport and deposition. The U.S. Geological Survey (USGS) has established cooperative agreements with the USDA and USFS to facilitate collaborative research at research sites in northwestern Mississippi.
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