DOI: 10.1029/2018JD028432
Scopus记录号: 2-s2.0-85050387547
论文题名: Role of Groundwater in the Dryland Ecohydrological System: A Case Study of the Heihe River Basin
作者: Yao Y. ; Tian Y. ; Andrews C. ; Li X. ; Zheng Y. ; Zheng C.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 13 起始页码: 6760
结束页码: 6776
语种: 英语
英文关键词: evaporation
; groundwater recharge
; groundwater-dependent ecosystem
; Heihe River Basin
; mountainous groundwater system
Scopus关键词: baseflow
; dryland farming
; ecohydrology
; ecosystem health
; evaporation
; groundwater
; groundwater flow
; hydrological modeling
; mountain environment
; recharge
; water budget
; China
; Gansu
; Hei River
英文摘要: Groundwater sustains food production and ecosystem health in drylands. Groundwater influences the interlinked hydrological processes and ecological state; however, the function of groundwater in the ecohydrological system is yet to be quantified clearly. In this study, we assess the role of groundwater in the ecohydrological system of the Heihe River Basin, using a regional-scale integrated model with multiple independent databases. Our results show that first, in over 40% of mid-lower plain, the groundwater table is less than 10 m deep, and both recharge and evaporation of groundwater dominate seasonal water budget variations; recharge is more affected by land use than groundwater evaporation, and it has a higher variability ranging over 2 orders of magnitude within vegetated land use type. Second, mountain block recharge maintains the piedmont groundwater; the upper mountainous partition between baseflow and mountain block recharge impacts the evaporation and two-way exchange between groundwater and stream/lake in the downstream alluvial plain. Third, the groundwater system stores over 50% of streamflow in the dry season and about 10% in the wet season along leakage segments; groundwater dominates the streams by contributing about 40% of streamflow in the dry season along the seepage segments of the middle alluvial plain. Fourth, shallow groundwater sustains a vibrant ecosystem directly by providing a stable source of water for vegetation and indirectly by buffering lateral groundwater flow. Our study not only bridges the quantification gap for regional studies of drylands but also provides suggestions on water management and future water sustainability and food security. ©2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113530
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Environmental Science, School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, China; School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, China; Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, Southern University of Science and Technology, Shenzhen, China; Institute of Water Sciences, College of Engineering, Peking University, Beijing, China; Department of Geological Sciences, University of Alabama, Tuscaloosa, AL, United States
Recommended Citation:
Yao Y.,Tian Y.,Andrews C.,et al. Role of Groundwater in the Dryland Ecohydrological System: A Case Study of the Heihe River Basin[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(13)