干旱区生态环境知识资源中心(Arid): The dimensions of deep-layer soil desiccation and its impact on xylem hydraulic conductivity in dryland tree plantations

Arid

DOI	10.5194/hess-28-1897-2024
	The dimensions of deep-layer soil desiccation and its impact on xylem hydraulic conductivity in dryland tree plantations
	He, Nana; Gao, Xiaodong; Guo, Dagang; Wu, Yabiao; Ge, Dong; Zhao, Lianhao; Tian, Lei; Zhao, Xining
通讯作者	Gao, XD
来源期刊	HYDROLOGY AND EARTH SYSTEM SCIENCES
ISSN	1027-5606
EISSN	1607-7938
出版年	2024
卷号	28 期号:8 页码:1897-1914
英文摘要	In water-limited areas, planted trees can extract substantial amounts of soil water from deep layers ( > 200 cm) to meet their high water demand, resulting in deep soil desiccation, which influences not only regional water cycling but also the sustainability of trees per se in drylands. However, the specific dimensions of deep soil desiccation in relation to both the soil moisture limitation and the maximum root water uptake (RWU) depth are still not well determined. Whether the dimensions depend on tree species and how they will affect trees' xylem hydraulic conductivity are also unclear, restricting our ability to predict the fate of dryland tree plantations. Therefore, we studied the spatiotemporal distribution of deep soil moisture deficit (DSMD) for two typical planted trees, apple (Malus pumila Mill.) and black locust (Robinia pseudoacacia L.), based on published data and multiple field samplings on China's Loess Plateau. The results indicated that the lowest deep soil moisture (DSM; units of gravimetric percent, i.e., grav-%) occurred under the planted trees aged 24-28 years at all sites. The lowest DSMD varied around - 0.6, which was close to the DSMD at the permanent wilting point (PWP, grav-%), regardless of tree species and site, although shallow ( < 200 cm) soil moisture was not reduced to the point of limitation. This suggests that PWP is a reliable indicator of the moisture limitation of deep-layer soil desiccation for the tree species examined. The corresponding depth of soil moisture use reached 18.0-22.0 m for these old planted trees at different sites, while it was more than 25 m for R . pseudoacacia in the drier site of Mizhi. Furthermore, the mean values of native percentage loss of hydraulic conductivity of planted trees' branches xylem reached 74.9 %-96.5 % in the plantations sampled in this study, indicating that tree mortality may occur. The findings help predict the sustainability of planted trees in semi-arid regions with a thick vadose zone.
类型	Article
语种	英语
开放获取类型	gold, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:001209926700001
WOS关键词	LOESS PLATEAU ; WATER-USE ; EUROPEAN BEECH ; MOISTURE ; TRANSPIRATION ; REVEGETATION ; RESTORATION ; MORTALITY ; RESPONSES ; DECLINE
WOS类目	Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404127
推荐引用方式 GB/T 7714	He, Nana,Gao, Xiaodong,Guo, Dagang,et al. The dimensions of deep-layer soil desiccation and its impact on xylem hydraulic conductivity in dryland tree plantations[J],2024,28(8):1897-1914.
APA	He, Nana.,Gao, Xiaodong.,Guo, Dagang.,Wu, Yabiao.,Ge, Dong.,...&Zhao, Xining.(2024).The dimensions of deep-layer soil desiccation and its impact on xylem hydraulic conductivity in dryland tree plantations.HYDROLOGY AND EARTH SYSTEM SCIENCES,28(8),1897-1914.
MLA	He, Nana,et al."The dimensions of deep-layer soil desiccation and its impact on xylem hydraulic conductivity in dryland tree plantations".HYDROLOGY AND EARTH SYSTEM SCIENCES 28.8(2024):1897-1914.