Evapotranspiration in a Prairie Ecosystem: Effects of Grazing by Cattle
作者： Dale J. Bremer , Lisa M. Auen , Jay M. Ham , Clenton E. Owensby
DOI: 10.2134/AGRONJ2001.932338X
关键词: Transpiration 、 Environmental science 、 Agroecosystem 、 Soil water 、 Grazing 、 Agronomy 、 Evapotranspiration 、 Grassland 、 Bowen ratio 、 Leaf area index
摘要: Grazing by ungulates is common in grasslands and may influence evapotranspiration (ET). The Bowen ratio energy balance method (BREB) was used to measure ET from grazed (GR) ungrazed (UGR) tallgrass prairie sites northeastern Kansas, USA. Yearling steers were stocked on the GR site day of year (DOY) 128 2(12 1999, data collected DOY 141 295. reduced 28% between 179 207; mean values 3.6 5.0 mm d - 1 (UGR). During that period, leaf area index (LAI) an average 78% lower site, below-normal precipitation kept soil dry near surface; hence, transpiration evaporation water decreased. Lower during conserved 0- 0.30-m profile site. Before (e.g., 152-179), similar treatments, despite 70% LAI compared with UGR Above-normal period probably maintained high soil, thereby compensating for reductions (via removal) Cumulative 155-d study estimated at 526 494 sites, respectively. Thus, grazing seasonal 6.1%. Late study, higher a Younger leaves regrowth after resulted delayed senescence, causing
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