Arid
DOI10.1002/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
ISSN1085-3278
EISSN1099-145X
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
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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).
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