干旱区生态环境知识资源中心(Arid): Bridging structural and functional hydrological connectivity in dryland ecosystems

Arid

DOI	10.1016/j.catena.2023.107322
	Bridging structural and functional hydrological connectivity in dryland ecosystems
	Crompton, Octavia; Katul, Gabriel; Lapides, Dana A.; Thompson, Sally E.
通讯作者	Crompton, O
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2023
卷号	231
英文摘要	On dryland hillslopes, vegetation water availability is often subsidized by the redistribution of rainfall runoff from bare soil (sources) to vegetation patches (sinks). In regions where rainfall volumes are too low to support spatially continuous plant growth, such functional connectivity between bare soil and vegetated areas enables the establishment and persistence of dryland ecosystems. Increasing the connectivity within bare soil areas can intensify runoff and increase water losses from hillslopes, disrupting this redistribution and reducing the water available to sustain ecosystem function. Inferring functional connectivity (from bare to vegetated, or within bare areas) from structural landscape features is an attractive approach to enable rapid, scalable characterization of dryland ecosystem function from remote observations. Such inference, however, would rely on metrics of structural connectivity, which describe the contiguity of bare soil areas. Several studies have observed nonstationarity in the relations between functional and structural connectivity metrics as rainfall conditions vary. Consequently, the suitability of using structural connectivity to provide a reliable proxy for functional connectivity remains uncertain and motivates the work here.Relations between structural and functional connectivity metrics are established based on model simulations of rainfall-runoff on hillslopes with varying soil properties and vegetation patterns. These relations vary between two hydrologic limits - a 'local' (patch-scale) limit, in which functional connectivity is related to structural connectivity, and a 'global' (hillslope-scale) limit, in which functional connectivity is most related to the hillslope vegetation fraction regardless of the structural connectivity of bare soil areas. The transition between these limits within the simulations depends on rainfall intensity and duration, and soil permeability. While the local limit may strengthen positive feedbacks between vegetation and water availability, the implications of these limits for dryland functioning need further exploration, particularly considering the timescale separation between storm runoff production and vegetation growth.
英文关键词	Connectivity Drylands Vegetation patterns Runoff Thresholds
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:001039111200001
WOS关键词	OVERLAND-FLOW CONNECTIVITY ; VEGETATION PATTERNS ; HYDRAULIC CONDUCTIVITY ; SEMIARID HILLSLOPES ; SOIL-EROSION ; RUNOFF ; INFILTRATION ; LANDSCAPES ; DESERTIFICATION ; REDISTRIBUTION
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/2XILL650/395702
推荐引用方式 GB/T 7714	Crompton, Octavia,Katul, Gabriel,Lapides, Dana A.,et al. Bridging structural and functional hydrological connectivity in dryland ecosystems[J],2023,231.
APA	Crompton, Octavia,Katul, Gabriel,Lapides, Dana A.,&Thompson, Sally E..(2023).Bridging structural and functional hydrological connectivity in dryland ecosystems.CATENA,231.
MLA	Crompton, Octavia,et al."Bridging structural and functional hydrological connectivity in dryland ecosystems".CATENA 231(2023).