Arid
DOI10.1016/j.jhydrol.2005.09.035
Effects of long-term water table drawdown on evapotranspiration and vegetation in an arid region phreatophyte community
Cooper, David J.; Sanderson, John S.; Stannard, David I.; Groeneveld, David P.
通讯作者Cooper, David J.
来源期刊JOURNAL OF HYDROLOGY
ISSN0022-1694
EISSN1879-2707
出版年2006
卷号325期号:1-4页码:21-34
英文摘要

Evapotranspiration rates and the ground water component of evapotranspiration at a site in Colorado’s San Luis Valley that is dominated by shrubby phreatophytes, (greasewood and rabbitbrush) were compared before and after a water table drawdown. Evapotranspiration (ET) rates at the site were first measured in 1985-1987 (pre-drawdown) when the mean water table depth was 0.92 m. Regional ground water pumping has since lowered the water table by 1.58 m, to a mean of 2.50 m. We measured ET at the same site in 1999-2003 (post-drawdown), and assessed physical and biological factors affecting the response of ET to water table drawdown. Vegetation changed markedly from the pre-drawdown to the post-drawdown period as phreatophytic shrubs invaded former wetland areas, and wetland grasses and grass-like species decreased. Lowering the water table reduced estimated total annual ET from a mean of 409.0 to 278.0 mm, a decrease of 32%, and the ground water component of ET (ETg), from a mean of 226.6 to 86.5 mm, a decrease of 62%. Two water table depth/ET models that have been used in the San Luis Valley overestimated the reduction in ETg due to lowering the water table by as much as 253%. While our results corroborate the generally observed negative correlation between ET rates and water table depth, they demonstrate that specific models to estimate ET as a function of water table depth, if not verified, may be prone to large errors. Both the water table drawdown and the vegetation change are continuing 20 years after the drawdown began, and it is unclear how site ET rates and processes will differ after the water table has stabilized and vegetation has adjusted to the new site hydrologic conditions. (c) 2005 Elsevier B.V. All rights reserved.


英文关键词ground water evapotranspiration water table decline phreatophytes San Luis valley
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000238776600002
WOS关键词RIPARIAN VEGETATION ; GREAT-BASIN ; GROUNDWATER ; TRANSPIRATION ; DISCHARGE ; VALLEY ; EVAPORATION ; GREASEWOOD ; ECOSYSTEM ; DECLINE
WOS类目Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向Engineering ; Geology ; Water Resources
来源机构United States Geological Survey ; Colorado State University
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/152229
作者单位(1)Colorado State Univ, Dept Forest Rangeland & Watershed Stewardship, Ft Collins, CO 80523 USA;(2)Colorado State Univ, Dept Biol, Ft Collins, CO 80523 USA;(3)US Geol Survey, Denver Fed Ctr, Lakewood, CO 80225 USA;(4)HydroBio Adv Remote Sensing, Santa Fe, NM 87501 USA
推荐引用方式
GB/T 7714
Cooper, David J.,Sanderson, John S.,Stannard, David I.,et al. Effects of long-term water table drawdown on evapotranspiration and vegetation in an arid region phreatophyte community[J]. United States Geological Survey, Colorado State University,2006,325(1-4):21-34.
APA Cooper, David J.,Sanderson, John S.,Stannard, David I.,&Groeneveld, David P..(2006).Effects of long-term water table drawdown on evapotranspiration and vegetation in an arid region phreatophyte community.JOURNAL OF HYDROLOGY,325(1-4),21-34.
MLA Cooper, David J.,et al."Effects of long-term water table drawdown on evapotranspiration and vegetation in an arid region phreatophyte community".JOURNAL OF HYDROLOGY 325.1-4(2006):21-34.
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