Spatiotemporal variations in growing season exchanges of CO2, H2O,and sensible heat in agricultural fields of the Southern GreatPlains Page: 4 of 35
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Interannual and Landuse Variations in SGP
1 fields. However, capturing the effect of moisture in predictive models remains a stubborn
2 problem (Gilmanov et al. 2003; Riley et al. 2003; Hanan et al. 2005, Lai et al. 2006; Inoue and
3 Olioso 2006).
5 The Southern Great Plains (SGP) region of the United States presents a challenging environment
6 for predicting surface exchanges, because of the frequent chronic and often severe moisture
7 limitations of the region. In the SGP, 80% of the area is managed for agriculture and grazing in a
8 variety of land cover types. Of the agricultural land, about 40% is planted in winter wheat, a C3
9 species growing from November to June followed by fallow; 40% is (mostly lightly grazed)
10 pasture containing mixes of C3 and C4 grasses that grow from March to October; and the
11 remaining 20% is planted with a mix of C3 and C4 crops (e.g., soy beans, grain sorghum, corn)
12 that grow from April through August (Cooley et al. 2005).
14 In this paper, we describe measurements and analyses that examine the spatial heterogeneity
15 within and across cover types, as well as the interannual variations in growing-season ecosystem-
16 atmosphere exchange for unirrigated agriculture. Within seven unirrigated SGP fields planted
17 with three different crop types, we measured NEE and latent heat, as well as sensible heat
18 exchanges, aboveground biomass, and associated surface meteorological and soil variables.
19 These measurements were made from July 2001 through summer 2003, as part of research
20 conducted by the U.S. Department of Energy Atmospheric Radiation Measurement Program
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Fischer, Marc L.; Billesbach, David P.; Berry, Joseph A.; Riley,William J. & Torn, Margaret S. Spatiotemporal variations in growing season exchanges of CO2, H2O,and sensible heat in agricultural fields of the Southern GreatPlains, article, June 13, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc899787/m1/4/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.