Recharge and Nitrate Transport Through the Deep Vadose Zone of the Loess Plateau: A Regional-Scale Model Investigation

doi:10.1029/2017WR022190

	Recharge and Nitrate Transport Through the Deep Vadose Zone of the Loess Plateau: A Regional-Scale Model Investigation
	Turkeltaub, Tuvia 1; Jia, Xiaoxu 2,3; Zhu, Yuanjun 4; Shao, Ming-An 2,3,4; Binley, Andrew 1
刊名	WATER RESOURCES RESEARCH
	2018-07-01
卷号	54 期号:7 页码:4332-4346
ISSN号	0043-1397
DOI	10.1029/2017WR022190
通讯作者	Turkeltaub, Tuvia(t.turkeltaub@lancaster.ac.uk)
英文摘要	The Loess Plateau of China (LPC) is suffering from the impacts of overexploitation of groundwater, leading to a decline in the regional water table. This is compounded by relatively recent large-scale transformation of land use, which may impact groundwater recharge and threaten future water quality from intensive nitrogen fertilizer application. Understanding the regional unsaturated water flow and nitrate travel time in the deep vadose zone is crucial for the sustainable management of the LPC groundwater system. We develop here a regional-scale model that exploits an extensive database of soil properties derived from recent intensive soil profile sampling over the LPC, together with climate, vadose zone thickness, and land use data. The model solves the Richards equation and a conservative solute transport model using a multiple 1D column approach. A comparison between model simulations and observations at five sites reveals good model performance. Application over the LPC indicates that areas with dense irrigated agricultural land use contribute significantly to groundwater recharge. By using land use cover information from 1975 to 2008, simulations reveal that the transition from agriculture to forest and grassland accounts for a small reduction of the total annual recharge (6.1%). Modeled nitrate travel times through the deep unsaturated zone range between decades and centuries; however, recent loading of anthropogenic nitrate is expected to reach the aquifer in the near future under irrigated areas or where the vadose zone is relatively thin. The model simulations provide valuable information for assessing future vulnerability of groundwater resources over a regional scale.
资助项目	Natural Environment Research Council[NE/N007409/1] ; National Natural Science Foundation of China[41571130081]
WOS关键词	SOIL-WATER CONTENT ; GROUNDWATER RECHARGE ; UNSATURATED ZONE ; HYDRAULIC CONDUCTIVITY ; NITROGEN-BALANCE ; NORTHERN CHINA ; FOOD SECURITY ; WINTER-WHEAT ; APPLE-TREES ; TIME-LAG
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000442502100009
资助机构	Natural Environment Research Council ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/54402]
专题	中国科学院地理科学与资源研究所
通讯作者	Turkeltaub, Tuvia
作者单位	1.Univ Lancaster, Lancaster Environm Ctr, Lancaster, England 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China 3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China 4.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess, Yangling, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Turkeltaub, Tuvia,Jia, Xiaoxu,Zhu, Yuanjun,et al. Recharge and Nitrate Transport Through the Deep Vadose Zone of the Loess Plateau: A Regional-Scale Model Investigation[J]. WATER RESOURCES RESEARCH,2018,54(7):4332-4346.
APA	Turkeltaub, Tuvia,Jia, Xiaoxu,Zhu, Yuanjun,Shao, Ming-An,&Binley, Andrew.(2018).Recharge and Nitrate Transport Through the Deep Vadose Zone of the Loess Plateau: A Regional-Scale Model Investigation.WATER RESOURCES RESEARCH,54(7),4332-4346.
MLA	Turkeltaub, Tuvia,et al."Recharge and Nitrate Transport Through the Deep Vadose Zone of the Loess Plateau: A Regional-Scale Model Investigation".WATER RESOURCES RESEARCH 54.7(2018):4332-4346.