Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.scitotenv.2016.11.016 |
Drought effect on biocrust resilience: High-speed winds result in crust burial and crust rupture and flaking | |
Kidron, Giora J.1![]() | |
通讯作者 | Kidron, Giora J. |
来源期刊 | SCIENCE OF THE TOTAL ENVIRONMENT
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ISSN | 0048-9697 |
EISSN | 1879-1026 |
出版年 | 2017 |
卷号 | 579页码:848-859 |
英文摘要 | Once established, biocrusts (known also as biological soil crusts or microbiotic crusts) are thought to be relatively resilient to wind erosion, with crust burial being considered as the main mechanism responsible for crust death. Thus far, to the best of our knowledge, crust flaking and rupture under natural conditions were not reported. We report herein a two-year study during two severe drought years (2010-2012) in a dunefield in the Negev Desert during which in addition to crust burial, crust rupture and flaking also took place. As for crust burial, it took place under sand sheets or coppice dunes (mounds). Subsequent removal of the coppice dunes by wind resulted in crust disintegration and erosion of the formerly buried crust and the formation of patches devoid of crusts termed herein ’erosion cirques’. As for crust flaking and rupture, it is explained by a large change in the properties of the extracellular polymeric substances (EPS) composing the crust. The EPS adherence and viscoelastic properties were monitored using a quartz crystal microbalance with dissipation monitoring (QCD-M) technology. EPS adherence and viscoelastic properties deduced from the QCM-D experiments suggest that crust coherence and elasticity, mediated by the EPS, were affected by droughts. Although crust flaking affected up to 25% of the interdunal surface, it is suggested that with continuous rain shortage, further crust flaking is likely to take place under continuous drought-driven dry surface conditions. This positive feedback mechanism, during which initially eroded crusts trigger additional crust erosion, may have severe consequences on the structure and function of drought prone ecosystems, and may endanger the stability of dunefields, causing dust storms, triggering dune encroachment and declining air quality. (C) 2016 Elsevier B.V. All rights reserved. |
英文关键词 | Crust erosion Negev Desert Resilience Vulnerability Wind power |
类型 | Article |
语种 | 英语 |
国家 | Israel |
收录类别 | SCI-E |
WOS记录号 | WOS:000391897800087 |
WOS关键词 | BIOLOGICAL SOIL CRUSTS ; POLYMERIC SUBSTANCES EPS ; INDUCED SEDIMENT YIELD ; NEGEV-DESERT ; MICROBIOTIC CRUSTS ; WESTERN NEGEV ; DUNE SLOPES ; VISCOELASTIC PROPERTIES ; FRICTION VELOCITY ; DUST EMISSIONS |
WOS类目 | Environmental Sciences |
WOS研究方向 | Environmental Sciences & Ecology |
来源机构 | Ben-Gurion University of the Negev ; Hebrew University of Jerusalem |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/202199 |
作者单位 | 1.Hebrew Univ Jerusalem, Inst Earth Sci, Givat Ram Campus, IL-91904 Jerusalem, Israel; 2.Ben Gurion Univ Negev, Zuckerberg Inst Water Res, Dept Desalinat & Water Treatment, Sede Boqer Campus, IL-84990 Sede Boqer, Israel |
推荐引用方式 GB/T 7714 | Kidron, Giora J.,Ying, Wang,Starinsky, Abraham,et al. Drought effect on biocrust resilience: High-speed winds result in crust burial and crust rupture and flaking[J]. Ben-Gurion University of the Negev, Hebrew University of Jerusalem,2017,579:848-859. |
APA | Kidron, Giora J.,Ying, Wang,Starinsky, Abraham,&Herzberg, Moshe.(2017).Drought effect on biocrust resilience: High-speed winds result in crust burial and crust rupture and flaking.SCIENCE OF THE TOTAL ENVIRONMENT,579,848-859. |
MLA | Kidron, Giora J.,et al."Drought effect on biocrust resilience: High-speed winds result in crust burial and crust rupture and flaking".SCIENCE OF THE TOTAL ENVIRONMENT 579(2017):848-859. |
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