Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1002/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
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ISSN | 1936-0584 |
EISSN | 1936-0592 |
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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