Traditional dry soil layer index method overestimates soil desiccation severity following conversion of cropland into forest and grassland on China's Loess Plateau

doi:10.1016/j.agee.2019.106794

IEECAS OpenIR > 生态环境研究室

	Traditional dry soil layer index method overestimates soil desiccation severity following conversion of cropland into forest and grassland on China's Loess Plateau
	Jia, Xiaoxu 1,2; Zhao, Chunlei 1,2; Wang, Yunqiang 3; Zhu, Yuanjun 4; Wei, Xiaorong 4; Shao, Ming'an 1,2
通讯作者	Zhao, Chunlei(zhaocl@igsnrr.ac.cn) ; Shao, Ming'an(shaoma@igsnrr.ac.cn)
	2020-04-01
发表期刊	AGRICULTURE ECOSYSTEMS & ENVIRONMENT
ISSN	0167-8809
卷号	291 页码:9
摘要	Due to severe soil erosion and low crop yield, sloping croplands have been converted into forests and grasslands during the past decades on China's Loess Plateau (CLP). The introduced exotic high-water consumption plants cause soil water deficit that leads to the formation of dry soil layer (DSL). The traditional index method used to determine the existence of DSL considers only soil hydraulic property of "stable field capacity" and fails to fully reflect the interactions between soil water and vegetation. A new index method that considers physiological response of vegetation to drought is needed for DSL research. Here, we proposed a new method to identify and quantify the severity of DSL and compared the proposed method with the traditional method using field data for the 5 m soil depth in typical tree (R. pseudoacacia, n = 85) and grass (M. sativa, n = 20) plantations on CLP. The number of sites detected with DSL through the new method was less than the traditional method for both species. Based on the traditional method, the level of DSL was even more severe; with mean DSL thickness of 3.2 for R. pseudoacacia and 3.9 m for M. sativa. Then for the new index method, it was only 2.4 m for both plantations. DSL formation depth was much deeper under the new method than the traditional method. Also mean plant available soil water (PASW) stored in the identified DSL by the traditional method was similar to 44.1 and 37.8 mm; accounting for 37.2 and 88.9% of total PASW in the 1-5 m soil profile under R. pseudoacacia and M. sativa, respectively. Thus, the traditional DSL index method overestimated DSL severity as it fails to account for plant soil water availability, especially in areas with coarser soil texture. The proposed new index method that is based on soil water potential is more suitable for characterization of DSL conditions under different soil types. This is critical for application in reclamation of DSLs and optimization of vegetation cover in the study area and beyond.
关键词	Soil drought Plant available soil water Agricultural land-use change China's loess plateau
DOI	10.1016/j.agee.2019.106794
关键词[WOS]	WATER CARRYING-CAPACITY ; VEGETATION ; STORAGE ; MODEL ; AVAILABILITY ; DYNAMICS ; MOISTURE ; REGION
收录类别	SCI ; SCI
语种	英语
资助项目	National Natural Science Foundation of China[41530854] ; National Natural Science Foundation of China[41907009] ; National Natural Science Foundation of China[41877016] ; National Key Project for Research and Development[2016YFC0501605] ; Youth Innovation Promotion Association of Chinese Academy of Sciences[2017076]
WOS研究方向	Agriculture ; Environmental Sciences & Ecology
项目资助者	National Natural Science Foundation of China ; National Key Project for Research and Development ; Youth Innovation Promotion Association of Chinese Academy of Sciences
WOS类目	Agriculture, Multidisciplinary ; Ecology ; Environmental Sciences
WOS记录号	WOS:000514930700008
出版者	ELSEVIER
引用统计	被引频次：72[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/12703
专题	生态环境研究室
通讯作者	Zhao, Chunlei; Shao, Ming'an
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China 3.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China 4.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Jia, Xiaoxu,Zhao, Chunlei,Wang, Yunqiang,et al. Traditional dry soil layer index method overestimates soil desiccation severity following conversion of cropland into forest and grassland on China's Loess Plateau[J]. AGRICULTURE ECOSYSTEMS & ENVIRONMENT,2020,291:9.
APA	Jia, Xiaoxu,Zhao, Chunlei,Wang, Yunqiang,Zhu, Yuanjun,Wei, Xiaorong,&Shao, Ming'an.(2020).Traditional dry soil layer index method overestimates soil desiccation severity following conversion of cropland into forest and grassland on China's Loess Plateau.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,291,9.
MLA	Jia, Xiaoxu,et al."Traditional dry soil layer index method overestimates soil desiccation severity following conversion of cropland into forest and grassland on China's Loess Plateau".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 291(2020):9.