干旱区生态环境知识资源中心(Arid): Biocrust-induced extracellular polymeric substances are responsible for dune stabilization in the Negev

Arid

DOI	10.1002/ldr.4146
	Biocrust-induced extracellular polymeric substances are responsible for dune stabilization in the Negev
	Kidron, Giora J.; Drahorad, Sylvie L.
通讯作者	Kidron, GJ (corresponding author), Hebrew Univ Jerusalem, Inst Earth Sci, Givat Ram Campus, IL-91904 Jerusalem, Israel.
来源期刊	LAND DEGRADATION & DEVELOPMENT
ISSN	1085-3278
EISSN	1099-145X
出版年	2022
英文摘要	There is no consensus over the factors responsible for dune stabilization in arid regions, with some scholars maintaining that dust (i.e., silt and clay) plays a major role in dune stabilization. Aiming to explore the principal driving factor responsible for dune stabilization in the Negev, we compared various biocrusts having different biomass and compressive strength, and performed surface degradation and illuviation experiments with dust in the presence or absence of biocrusts in order to assess the crust role in impeding wind erosion and dust illuviation. We show that dust cannot be regarded as the primary driving factor for crust strength and subsequently for dune stabilization in the Negev, as suggested in some publications. This function is however fulfilled by extracellular polymeric substances (EPS, mostly polysaccharides), which are excreted by the biocrust (mainly cyanobacteria), and serve as a cementing agent for the establishing crust and therefore for the dust. Exhibiting high water absorption and strong adhering properties, EPS is responsible for granting strength to the crust, impeding wind erosion and dust illuviation, thus providing the necessary cementing agent, which facilitates dune stabilization in the Negev. Global warming which may result in frequent droughts and high input of dust may not contribute to dune stabilization as suggested by some scholars, but rather will negatively affect dune stabilization, as it may result in EPS degradation and subsequently in dune mobilization.
英文关键词	compressive strength dust exopolysaccharides illuviation experiment pedogenesis penetration resistance
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000735203600001
WOS关键词	BIOLOGICAL SOIL CRUSTS ; INDUCED SEDIMENT YIELD ; WESTERN NEGEV ; MICROBIOTIC CRUSTS ; SANDY SOILS ; CYANOBACTERIAL EXOPOLYSACCHARIDES ; TENGGER DESERT ; CLIMATE-CHANGE ; WIND EROSION ; SURFACES
WOS类目	Environmental Sciences ; Soil Science
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/374758
作者单位	[Kidron, Giora J.] Hebrew Univ Jerusalem, Inst Earth Sci, Givat Ram Campus, IL-91904 Jerusalem, Israel; [Drahorad, Sylvie L.] Justus Liebig Univ Giessen, IFZ, Inst Phys Chem, Giessen, Germany; [Drahorad, Sylvie L.] Justus Liebig Univ Giessen, IFZ, Inst Soil Sci & Soil Conservat, Giessen, Germany
推荐引用方式 GB/T 7714	Kidron, Giora J.,Drahorad, Sylvie L.. Biocrust-induced extracellular polymeric substances are responsible for dune stabilization in the Negev[J],2022.
APA	Kidron, Giora J.,&Drahorad, Sylvie L..(2022).Biocrust-induced extracellular polymeric substances are responsible for dune stabilization in the Negev.LAND DEGRADATION & DEVELOPMENT.
MLA	Kidron, Giora J.,et al."Biocrust-induced extracellular polymeric substances are responsible for dune stabilization in the Negev".LAND DEGRADATION & DEVELOPMENT (2022).