干旱区生态环境知识资源中心(Arid): Lateral Flow and Contributing Area Control Vegetation Cover in a Semiarid Environment

Arid

DOI	10.1029/2021WR030998
	Lateral Flow and Contributing Area Control Vegetation Cover in a Semiarid Environment
	Svoray, Tal; Sela, Shai; Chen, Li; Assouline, Shmuel
通讯作者	Svoray, T (corresponding author)，Ben Gurion Univ Negev, Geog & Environm Dev, Beer Sheva, Israel.
来源期刊	WATER RESOURCES RESEARCH
ISSN	0043-1397
EISSN	1944-7973
出版年	2021
卷号	57 期号:12
英文摘要	Semiarid ecosystems attract attention, because they support the life of large human populations, while functioning under growing threats of degradation due to global climate change that may lead to reduced productivity and possibly irreversible desertification. Empirical support is consequently highly sought after to validate the soil-moisture-biomass relationship at the local scale in these ecosystems. Combining physically based models and a database of 32 years of field and remotely sensed data, we examined the effect of soil-moisture content (SMC) on vegetation cover and patch size distribution in the heterogenous semiarid Lehavim LTER in the Negev Desert, Israel. Results from numerical solutions of flow equations in the shallow soil layer allowed predictions of distributions of SMC as the outcome of vertical and lateral water fluxes. The association of vertical fluxes with patch size distribution and vegetation cover did not support the notion that direct rainfall is sufficient for the shrubs' survival in drought conditions. However, re-infiltration of downslope runoff, generated in sealed bare intershrub soil area, significantly contributed to the water available to supporting shrub patches. Accordingly, our approach determines potential vegetation cover in semiarid areas, due to the dependency on contributing area and rainfall-infiltration-runoff processes. This underscores the fact that, additionally to infiltration from direct rainfall, run-on contribution controls vegetation cover in semiarid environments. We therefore suggest that estimations of shrub resilience to water stress should consider scenarios involving surface sealing, rainfall duration and intensity, and contributing area size-each in accordance with the contribution of lateral flows to the water available to shrubs.
英文关键词	desertification hydrological dynamics runoff vegetation cover soil-moisture patterns spatio-temporal variability
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000735901700018
WOS关键词	ECOHYDROLOGICAL PROCESSES ; ECOSYSTEM SERVICES ; LAND DEGRADATION ; SOIL-MOISTURE ; SHRUB COVER ; WATER ; RAINFALL ; INFILTRATION ; PATTERNS ; EROSION
WOS类目	Environmental Sciences ; Limnology ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/375744
作者单位	[Svoray, Tal] Ben Gurion Univ Negev, Geog & Environm Dev, Beer Sheva, Israel; [Sela, Shai] Agmatix Ltd, Tel Aviv, Israel; [Chen, Li] Nanjing Univ Informat Sci & Technol, Sch Hydrol & Water Resources, Nanjing, Peoples R China; [Assouline, Shmuel] ARO Volcani Inst, Environm Phys & Irrigat, Rishon Leziyyon, Israel
推荐引用方式 GB/T 7714	Svoray, Tal,Sela, Shai,Chen, Li,et al. Lateral Flow and Contributing Area Control Vegetation Cover in a Semiarid Environment[J],2021,57(12).
APA	Svoray, Tal,Sela, Shai,Chen, Li,&Assouline, Shmuel.(2021).Lateral Flow and Contributing Area Control Vegetation Cover in a Semiarid Environment.WATER RESOURCES RESEARCH,57(12).
MLA	Svoray, Tal,et al."Lateral Flow and Contributing Area Control Vegetation Cover in a Semiarid Environment".WATER RESOURCES RESEARCH 57.12(2021).