干旱区生态环境知识资源中心(Arid): Soil water depletion and restoration under inter-conversion of food crop and alfalfa with three consecutive wet years

Arid

DOI	10.1016/j.jhydrol.2020.124851
	Soil water depletion and restoration under inter-conversion of food crop and alfalfa with three consecutive wet years
	Ge, Jiamin 1,2; Fan, Jun 1,3; Yuan, Hongyou 3; Yang, Xueting 1,2; Jin, Mu 3; Wang, Sheng 1,2
通讯作者	Fan, Jun
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2020
卷号	585
英文摘要	With the implementation of the Grain-for-Green program, artificial vegetation was introduced on the Loess Plateau, which resulted in high soil water content (SWC) depletion. Currently, lack of soil water recharge is one of the most serious challenges on the Loess Plateau. Soil drying and wetting processes are critical for the sustainability of soil water recycling, but this has not been well studied. There is also a lack of physical definition of the upper bound SWC of dried soil layers (DSL). In this study, soil water dynamics - the change of SWC affected by precipitation and vegetation transpiration - were studied under converted vegetation. In-situ SWC measurements from the 0-5 m or 0-8 m deep profile over consecutive wet years (from 2016 to 2018 with an average precipitation of 660.9 mm) were analyzed to understand soil water depletion and restoration processes. Results showed distinct differences in soil water dynamics in the soil profiles and soil water balances under different vegetation types. SWC under continuous perennial alfalfa (Medicago sativa) had greater fluctuations between 0 and 300 cm than below 300 cm, and a DSL was observed below 300 cm. After converting from alfalfa to soybean (Glycine max), SWC increased greatly during the three wet years. Soil water storage (S) increased at an average rate of 35.8 mm year(-1) m(-1) within the top 500 cm of the soil profile, average evapotranspiration (ET) was 482.0 mm year(-1) , and maximum restoration depth of soil water extended to 660 cm. However, SWC gradually decreased over time after replacing food crop with alfalfa. S declined at an average rate of 21.4 mm year(-1) m(-1) within the top 500 cm of the soil profile, average ET was 680.4 mm year(-1) and the maximum depth of soil water depletion extended to 360 cm. These results suggest that SWC in deep layers can be depleted and replenished quickly, and the processes were dominated by vegetation types and precipitation. Taking vegetation types and soil texture into consideration, the calculation of upper bound SWC of DSL was redefined. Given the long-term effects of high water demand from vegetation such as alfalfa on the soil water balance, ET of vegetation should be reduced through conversion to less water-intensive vegetation types or biomass control (i.e. reduced planting density appropriately) in arid areas of the Loess Plateau.
英文关键词	Vegetation conversion Soil water restoration Water balance Dried soil layer (DSL) Water-wind erosion crisscross region The Chinese Loess Plateau
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000544230000089
WOS关键词	DIFFERENT VEGETATION TYPES ; LOESS PLATEAU ; LAND-USE ; PRECIPITATION GRADIENT ; MOISTURE DECLINE ; ROOTING DEPTH ; STORAGE ; DESICCATION ; REGION ; DYNAMICS
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/319662
作者单位	1.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China; 2.Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China; 3.Northwest A&F Univ, Inst Soil & Water Conservat, 3 Taicheng Rd, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Ge, Jiamin,Fan, Jun,Yuan, Hongyou,et al. Soil water depletion and restoration under inter-conversion of food crop and alfalfa with three consecutive wet years[J]. 西北农林科技大学,2020,585.
APA	Ge, Jiamin,Fan, Jun,Yuan, Hongyou,Yang, Xueting,Jin, Mu,&Wang, Sheng.(2020).Soil water depletion and restoration under inter-conversion of food crop and alfalfa with three consecutive wet years.JOURNAL OF HYDROLOGY,585.
MLA	Ge, Jiamin,et al."Soil water depletion and restoration under inter-conversion of food crop and alfalfa with three consecutive wet years".JOURNAL OF HYDROLOGY 585(2020).