Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1002/2015JG003185 |
The dual role of soil crusts in desertification | |
Assouline, S.1; Thompson, S. E.2; Chen, L.3![]() | |
通讯作者 | Assouline, S. |
来源期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
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ISSN | 2169-8953 |
EISSN | 2169-8961 |
出版年 | 2015 |
卷号 | 120期号:10页码:2108-2119 |
英文摘要 | Vegetation cover in dry regions is a key variable in determining desertification. Soils exposed to rainfall by desertification can form physical crusts that reduce infiltration, exacerbating water stress on the remaining vegetation. Paradoxically, field studies show that crust removal is associated with plant mortality in desert systems, while artificial biological crusts can improve plant regeneration. Here it is shown how physical crusts can act as either drivers of or buffers against desertification depending on their environmental context. The behavior of crusts is first explored using a simplified theory for water movement on a uniform, partly vegetated slope subject to stationary hydrologic conditions. Numerical model runs supplemented with field data from a semiarid Long-Term Ecological Research site are then applied to represent more realistic environmental conditions. When vegetation cover is significant, crusts can drive desertification, but this process is potentially self-limiting. For low vegetation cover, crusts mitigate against desertification by providing water subsidy to plant communities through a runoff-runon mechanism. |
英文关键词 | physical crusts desertification runoff-runon recovery model infiltration |
类型 | Article |
语种 | 英语 |
国家 | Israel ; USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000368730300015 |
WOS关键词 | NEGEV DESERT ; GLOBAL DESERTIFICATION ; HYDROLOGICAL RESPONSE ; STIPA-TENACISSIMA ; NORTHERN CHINA ; SURFACE CRUSTS ; GREENING SAHEL ; SHRUB PATCHES ; OVERLAND-FLOW ; TIGER BUSH |
WOS类目 | Environmental Sciences ; Geosciences, Multidisciplinary |
WOS研究方向 | Environmental Sciences & Ecology ; Geology |
来源机构 | Ben-Gurion University of the Negev ; University of California, Berkeley ; Desert Research Institute |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/188710 |
作者单位 | 1.Volcani Ctr, Inst Soil Water & Environm Sci, ARO, Bet Dagan, Israel; 2.Univ Calif Berkeley, Dept Civil & Environm Engn, Berkeley, CA 94720 USA; 3.Desert Res Inst, Div Hydrol Sci, Las Vegas, NV USA; 4.Ben Gurion Univ Negev, Geog & Environm Dev, IL-84105 Beer Sheva, Israel; 5.Duke Univ, Nicholas Sch Environm, Durham, NC USA; 6.Duke Univ, Pratt Sch Engn, Durham, NC USA |
推荐引用方式 GB/T 7714 | Assouline, S.,Thompson, S. E.,Chen, L.,et al. The dual role of soil crusts in desertification[J]. Ben-Gurion University of the Negev, University of California, Berkeley, Desert Research Institute,2015,120(10):2108-2119. |
APA | Assouline, S.,Thompson, S. E.,Chen, L.,Svoray, T.,Sela, S.,&Katul, G. G..(2015).The dual role of soil crusts in desertification.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,120(10),2108-2119. |
MLA | Assouline, S.,et al."The dual role of soil crusts in desertification".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 120.10(2015):2108-2119. |
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