Modeling long-term soil water dynamics in response to land-use change in a semi-arid area

doi:10.1016/j.jhydrol.2020.124824

	Modeling long-term soil water dynamics in response to land-use change in a semi-arid area
	Bai, Xiao 2; Jia, Xiaoxu 3,4; Jia, Yuhua 5; Shao, Ming'an 2,3,4; Hu, Wei 1
刊名	JOURNAL OF HYDROLOGY
	2020-06-01
卷号	585 页码:12
关键词	Soil water dynamics Dry soil layer Land use change Hydrus-1D model Chinese Loess Plateau
ISSN号	0022-1694
DOI	10.1016/j.jhydrol.2020.124824
通讯作者	Jia, Xiaoxu(jiaxx@igsnrr.ac.cn)
英文摘要	Soil water content (SWC) is critical for the health and sustainability of the ecosystem in water limited areas. Characterized by low precipitation and deep groundwater, the Chinese Loess Plateau (CLP) has experienced intensive agricultural and revegetation activities for a period long enough to alter the state of SWC to the extent that can affect plant growth and water cycle. Knowledge of long-term SWC dynamics under land-use change is therefore important for optimal water management and vegetation restoration in this water-scarce region. This study simulated and analyzed long-term (1970-2060) variations in SWC in the top 4-m soil layer in response to land-use change on CLP using the Hydrus-1D model. Soil and plant parameters required for the model were validated using in situ SWC data for different land-use types - exotic grass (M. sativa), exotic shrub (C. korshinskii), arable crop (S. italica or V. radiata) and natural grass (S. bungeana). Five phases of SWC dynamics driven by land-use change were identified: i) fluctuation of SWC with rainfall during arable cropping period; ii) rapid drop of SWC after exotic plant establishment; iii) period of no change for which SWC remained low and stable; iv) gradual recovery of SWC after conversion of exotic vegetation into natural grass; and v) fluctuation of SWC with rainfall under natural grass. Particularly, SWC decreased rapidly with the planting of M. sativa and C. korshinskii and water depletion depth increased with plant growth after revegetation. Dry soil layer (DSL) began to develop below 1-m after 3 years of growth of M. sativa or C. korshinskii. Also, SWC at depth below 1 m remained low and unavailable for plant growth. Compared with arable cropland, SWC in the 1-4 m soil layer decreased by 33% under both exotic grass and shrub during vegetation restoration period. However, it took 7-8 years for soil water to recover in the 0-4 m soil layer after 13-year (2004-2016) exotic grass or shrub was converted to natural grass. This suggested that DSL in the 4-m soil depth can fully recover by changing vegetation type. We concluded that planting M. sativa and C. korshinskii on arable cropland could enhance DSL formation in deep soil profile, but can gradually disappear upon land-use change. The results provided useful information for the prediction of long-term dynamics of soil water with land-use change. This is critical for the management of soil water in water limited areas.
资助项目	National Natural Science Foundation of China[41877016] ; National Natural Science Foundation of China[41530854] ; National Key Research and Development Program of China[2016YFC0501605] ; Youth Innovation Promotion Association of Chinese Academy of Sciences[2017076]
WOS关键词	LOESS PLATEAU ; CARRYING-CAPACITY ; FINE-ROOT ; VEGETATION ; MOISTURE ; REGION ; REVEGETATION ; DESICCATION ; OPTIMIZATION ; RESTORATION
WOS研究方向	Engineering ; Geology ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000544230000076
资助机构	National Natural Science Foundation of China ; National Key Research and Development Program of China ; Youth Innovation Promotion Association of Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/162446]
专题	中国科学院地理科学与资源研究所
通讯作者	Jia, Xiaoxu
作者单位	1.New Zealand Inst Plant & Food Res Ltd, Private Bag 4704, Christchurch 8140, New Zealand 2.Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, 11 Datun Rd, Beijing 100101, Peoples R China 4.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China 5.Shenyang Agr Univ, Coll Water Conservancy, Shenyang 110866, Peoples R China
推荐引用方式 GB/T 7714	Bai, Xiao,Jia, Xiaoxu,Jia, Yuhua,et al. Modeling long-term soil water dynamics in response to land-use change in a semi-arid area[J]. JOURNAL OF HYDROLOGY,2020,585:12.
APA	Bai, Xiao,Jia, Xiaoxu,Jia, Yuhua,Shao, Ming'an,&Hu, Wei.(2020).Modeling long-term soil water dynamics in response to land-use change in a semi-arid area.JOURNAL OF HYDROLOGY,585,12.
MLA	Bai, Xiao,et al."Modeling long-term soil water dynamics in response to land-use change in a semi-arid area".JOURNAL OF HYDROLOGY 585(2020):12.