气候变化领域集成服务门户(CCPortal): A New Method of Estimating Groundwater Evapotranspiration at Sub-Daily Scale Using Water Table Fluctuations

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DOI	10.3390/w14060876
	A New Method of Estimating Groundwater Evapotranspiration at Sub-Daily Scale Using Water Table Fluctuations
	Su, Yonghong; Feng, Qi; Zhu, Gaofeng; Wang, Yunquan; Zhang, Qi
通讯作者	Su, YH (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Ecohydrol Inland River Basin CAS, Lanzhou 730000, Peoples R China. ; Su, YH (通讯作者)，Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China.
发表日期	2022
EISSN	2073-4441
卷号	14 期号:6
英文摘要	Riparian ecosystems fundamentally depend on groundwater, and accurate estimations of groundwater evapotranspiration (ETG) are important for understanding ecosystem functionality and managing regional water resources. Over the past several decades, various methods have been proposed to estimate groundwater evapotranspiration based on water table fluctuations. However, the majority of methods cannot resolve sub-daily variations in ETG. In this study, we proposed a new hydraulic theory-based ETG estimation method at a sub-daily time scale. To evaluate its performance, we employed a variety of measurements (i.e., water table levels, latent heat flux and soil water contents) at a riparian forest (T. ramosissima) in Northwest China from 25 July to 10 October in 2017. The results indicated that the proposed method can successfully estimate ETG at both sub-daily (R-2 = 0.75) and daily (R-2 = 0.88) time scales, but the variations in the specific yield under different water table conditions should be carefully taken into account. In addition, we investigated the seasonal variations in water uptake source of the riparian plant, and found that it had strong plasticity in water usage during the study period. That is, it consumed approximately equal amounts of soil water and groundwater when soil moisture was available, and tended to consume more groundwater for survival as the soil moisture was depleted. To verify the seasonal patterns of the water uptake of the riparian forest, systematic isotope-based studies are needed in future study.
关键词	SOIL-WATER PATTERNS DESERT VEGETATION SHALLOW SHRUBS PLANTS
英文关键词	riparian forest; groundwater evapotranspiration; water table fluctuation; specific yield; water balance; plant water uptake
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
WOS类目	Environmental Sciences ; Water Resources
WOS记录号	WOS:000774557300001
来源期刊	WATER
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254272
作者单位	[Su, Yonghong; Feng, Qi; Zhang, Qi] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Ecohydrol Inland River Basin CAS, Lanzhou 730000, Peoples R China; [Su, Yonghong; Feng, Qi; Zhang, Qi] Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China; [Zhu, Gaofeng] Lanzhou Univ, Coll Earth & Environm Sci, Lanzhou 730000, Peoples R China; [Wang, Yunquan] China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China
推荐引用方式 GB/T 7714	Su, Yonghong,Feng, Qi,Zhu, Gaofeng,et al. A New Method of Estimating Groundwater Evapotranspiration at Sub-Daily Scale Using Water Table Fluctuations[J]. 中国科学院西北生态环境资源研究院,2022,14(6).
APA	Su, Yonghong,Feng, Qi,Zhu, Gaofeng,Wang, Yunquan,&Zhang, Qi.(2022).A New Method of Estimating Groundwater Evapotranspiration at Sub-Daily Scale Using Water Table Fluctuations.WATER,14(6).
MLA	Su, Yonghong,et al."A New Method of Estimating Groundwater Evapotranspiration at Sub-Daily Scale Using Water Table Fluctuations".WATER 14.6(2022).