HR: 1330h
AN: B42A-0944    [PDF]
TI: Preliminary Net Carbon Exchange Measurements in the Nebraska Sand Hills
AU: * Arkebauer, T
EM: tja@unl.edu
AF: University of Nebraska-Lincoln, Dept. of Agronomy and Horticulture, Lincoln, NE 68583-0817 United States
AU: Billesbach, D
EM: dbillesbach1@unl.edu
AF: University of Nebraska-Lincoln, Dept. of Biological Systems Engineering, Lincoln, NE 68583-0726 United States
AB: The Nebraska Sand Hills are the largest stabilized dune field in the world; they cover more than 50,000 square kilometers. The native vegetation is classified as a mixed grass prairie and the most common land use is cattle grazing. The proximity of the High Plains Aquifer to the land surface in this area gives rise to areas of abundant soil moisture in the generally semi-arid climate. This leads to an uncoupling of vegetation dynamics (including net carbon exchange) and recent precipitation in much of the region. We will present preliminary results of net ecosystem carbon exchange from eddy covariance measurements and soil surface carbon dioxide fluxes determined using a chamber technique. Fluxes will be examined in terms of relevant environmental and biological paramenters.
DE: 0400 Biogeosciences
DE: 1615 Biogeochemical processes (4805)
DE: 3322 Land/atmosphere interactions
SC: Biogeosciences [B]
MN: 2003 Fall Meeting