Arid
DOI10.1002/eco.1574
Extreme drought effects on summer evapotranspiration and energy balance of a grassland in the Southern Great Plains
Rajan, Nithya1; Maas, Stephan J.2; Cui, Song3
通讯作者Rajan, Nithya
来源期刊ECOHYDROLOGY
ISSN1936-0584
EISSN1936-0592
出版年2015
卷号8期号:7页码:1194-1204
英文摘要

We investigated the impact of the 2011 severe drought on summer evapotranspiration (ET) and energy partitioning of a managed Old World bluestem grassland in the Southern Great Plains and compared the results with those from 2010, a hydrologically wet year. Measurements of CO2, latent heat (LE), and sensible heat (H) fluxes were made using an eddy covariance flux tower. In 2010, the total precipitation received during the summer months (June-August) was 82% above the 9-year average precipitation, and in 2011, it was only 8% of the 9-year average precipitation. The amount of net radiation (R-n) available at the surface was higher in the wet year (54.3% of the incident radiation) compared with the drought year (41.1% of the incident radiation). In 2010, LE consumed the majority of available energy resulting in a high evaporative fraction (EF). In 2011, less energy was converted to LE as soil moisture remained low, which also resulted in reduced plant growth. Thus, the energy partitioning in 2011 was dominated by H. Significant differences in bulk canopy conductance (G(s)) were also observed between the two years. In both years, G(s) was linearly correlated with soil volumetric water content in the top 4cm of the soil profile. The gross primary production (GPP) was linearly correlated to ET. The water use efficiency was 2.63gCkg(-1) of water in 2010 and 0.69gCkg(-1) of water in 2011. Results from this study showed that, in semi-arid grasslands, the ET and energy balance are strongly affected by water availability. Copyright (c) 2014 John Wiley & Sons, Ltd.


英文关键词evapotranspiration latent heat flux sensible heat flux eddy covariance Bowen ratio surface conductance grassland evaporative fraction
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000363889100002
WOS关键词NET ECOSYSTEM EXCHANGE ; OLD-WORLD BLUESTEMS ; TEXAS HIGH-PLAINS ; WATER-VAPOR ; CARBON-DIOXIDE ; PRAIRIE ECOSYSTEM ; AGRICULTURAL LAND ; EDDY COVARIANCE ; SURFACE FLUXES ; SOIL-MOISTURE
WOS类目Ecology ; Environmental Sciences ; Water Resources
WOS研究方向Environmental Sciences & Ecology ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/186750
作者单位1.Texas A&M AgriLife Res & Extens Ctr, Vernon, TX 76385 USA;
2.Texas Tech Univ, Dept Plant & Soil Sci, Lubbock, TX 79409 USA;
3.Middle Tennessee State Univ, Sch Agribusiness & Agrisci, Murfreesboro, TN 37130 USA
推荐引用方式
GB/T 7714
Rajan, Nithya,Maas, Stephan J.,Cui, Song. Extreme drought effects on summer evapotranspiration and energy balance of a grassland in the Southern Great Plains[J],2015,8(7):1194-1204.
APA Rajan, Nithya,Maas, Stephan J.,&Cui, Song.(2015).Extreme drought effects on summer evapotranspiration and energy balance of a grassland in the Southern Great Plains.ECOHYDROLOGY,8(7),1194-1204.
MLA Rajan, Nithya,et al."Extreme drought effects on summer evapotranspiration and energy balance of a grassland in the Southern Great Plains".ECOHYDROLOGY 8.7(2015):1194-1204.
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