干旱区生态环境知识资源中心(Arid): Effect of shrubs on soil saturated hydraulic conductivity depends on the grazing regime in a semi-arid shrub-encroached grassland

Arid

DOI	10.1016/j.catena.2021.105680
	Effect of shrubs on soil saturated hydraulic conductivity depends on the grazing regime in a semi-arid shrub-encroached grassland
	Cai, Yurong; Yan, Yuchun; Wang, Chu; Xu, Dawei; Wang, Xu; Xin, Xiaoping; Chen, Jinqiang; Eldridge, David J.
通讯作者	Yan, YC (corresponding author), 12 Zhonguancun South St, Beijing 100081, Peoples R China.
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2021
卷号	207
英文摘要	Encroachment of woody plants has a positive effect on hydrological functions (e.g., infiltration), but few studies have examined the effects of shrub patches on infiltration under different grazing scenarios. We examined differences in characteristics of plants and soils and saturated hydraulic conductivity between shrubs and their associated interspaces in two grazing regimes at three sites in a semi-arid grassland encroached by Caragana microphylla, a leguminous N-fixing shrub. The results showed that the shrub patches had greater plant height, cover, and biomass compared to interspaces, and the shrubs positively affected the characteristics of soils such as porosity and water holding capacity, whereas grazing had a strong opposite effect. The effect of the relative interaction intensity (RII) of shrubs on the saturated hydraulic conductivity of the soil was greater under grazed (0.60) than ungrazed conditions (-0.01), and the negative effect of grazing was mainly achieved in interspaces. Generally, structural equation modeling revealed positive indirect effects of shrubs on saturated hydraulic conductivity via a greater root mass, with 3.5 times of that in interspaces and a lower bulk density (90% of that in interspaces) under conditions of overgrazing. Our findings highlight the critical role that shrubs play in maintaining infiltration under overgrazing conditions and suggest that they might partially offset the damaging effects of overgrazing on infiltration. Thus, shrub encroachment might be an adaptive mechanism of grassland ecosystems to encounter intensive human induced disturbance such as overgrazing.
英文关键词	Saturated hydraulic conductivity Root biomass Shrub encroachment Self-resistance Grazing exclusion
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000703268900098
WOS关键词	CLIMATE-CHANGE ; ECOSYSTEM STRUCTURE ; ORGANIC-CARBON ; LAND-USE ; INFILTRATION ; VEGETATION ; NUTRIENTS ; SERVICES ; NITROGEN ; IMPACTS
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/362820
作者单位	[Cai, Yurong; Yan, Yuchun; Wang, Chu; Xu, Dawei; Wang, Xu; Xin, Xiaoping; Chen, Jinqiang] Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China; [Eldridge, David J.] Univ New South Wales, Ctr Ecosyst Sci, Sch Biol Earth & Environm Sci, Sydney, NSW 2052, Australia
推荐引用方式 GB/T 7714	Cai, Yurong,Yan, Yuchun,Wang, Chu,et al. Effect of shrubs on soil saturated hydraulic conductivity depends on the grazing regime in a semi-arid shrub-encroached grassland[J],2021,207.
APA	Cai, Yurong.,Yan, Yuchun.,Wang, Chu.,Xu, Dawei.,Wang, Xu.,...&Eldridge, David J..(2021).Effect of shrubs on soil saturated hydraulic conductivity depends on the grazing regime in a semi-arid shrub-encroached grassland.CATENA,207.
MLA	Cai, Yurong,et al."Effect of shrubs on soil saturated hydraulic conductivity depends on the grazing regime in a semi-arid shrub-encroached grassland".CATENA 207(2021).