干旱区生态环境知识资源中心(Arid): Exopolysaccharides may increase biocrust rigidity and induce runoff generation

Arid

DOI	10.1016/j.jhydrol.2020.125081
	Exopolysaccharides may increase biocrust rigidity and induce runoff generation
	Kidron, Giora J.; Wang, Ying; Herzberg, Moshe
通讯作者	Kidron, GJ
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2020
卷号	588
英文摘要	The potential of biocrusts (biological soil crusts) to generate runoff is a matter of great controversy, especially in arid and semiarid regions. Most authors maintain that runoff in the presence of biocrusts is generated as a result of hydrophobicity, crust structure, texture or surface roughness. Hypothesizing that runoff over biocrusts may result from partial pore clogging, brought on by extracellular polymeric substances (EPS), we compare two crust types from Nizzana in the northwestern Negev, Israel (NIZ(ID) , NIZ(PON)) that readily generate runoff under natural field conditions to a crust type from Nizzanim in the southern coast of Israel (NIMID) that fails to generate runoff. We hypothesize that biocrust-induced EPS of the NIZ crusts will have different biochemical and viscoelastic properties than that of NIM. We conducted sprinkling experiments on the crusts, measured the biochemical properties (thickness, water repellency, compressive strength, water-holding capacity, silt and clay content, roughness) and the adhesion and viscoelastic properties of the crust EPS using quartz crystal microbalance with dissipation monitoring (QCM-D). Both crusts were not water repellent and were characterized by a relatively smooth surface. The NIZ crusts were however characterized by higher water-holding capacity and compressive strength. As far as the EPS is concerned, higher shear viscosity and shear modulus characterized the NIZ crusts, indicating higher crust integrity and rigidity and the formation of durable mineral grain-EPS matrix of the NIZ crusts. The findings point to a possible link between crust rigidity and runoff coefficients providing supporting evident for the role played by EPS in crust formation and runoff generation. Knowledge regarding the potentiality of runoff and hence water redistribution may assist in ecosystem management and agroforestry practices.
英文关键词	Biological soil crust Extracellular polymeric substances Infiltration Pore clogging Negev Desert
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000568826300025
WOS关键词	BIOLOGICAL SOIL CRUSTS ; POLYMERIC SUBSTANCES EPS ; NEGEV DESERT ; MICROBIOTIC CRUSTS ; WATER REPELLENCY ; CYANOBACTERIAL EXOPOLYSACCHARIDES ; WESTERN NEGEV ; DUNE SLOPES ; SANDY SOILS ; EROSION
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
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/2XILL650/326244
作者单位	[Kidron, Giora J.] Hebrew Univ Jerusalem, Inst Earth Sci, Givat Ram Campus, IL-91904 Jerusalem, Israel; [Wang, Ying] Sichuan Agr Univ, Coll Water Conservancy & Hydropower Engn, Yaan 625014, Peoples R China; [Herzberg, Moshe] Ben Gurion Univ Negev, Zuckerberg Inst Water Res, Dept Desalinat & Water Treatment, Sede Boqer Campus, IL-84990 Beer Sheva, Israel
推荐引用方式 GB/T 7714	Kidron, Giora J.,Wang, Ying,Herzberg, Moshe. Exopolysaccharides may increase biocrust rigidity and induce runoff generation[J]. Ben-Gurion University of the Negev, Hebrew University of Jerusalem,2020,588.
APA	Kidron, Giora J.,Wang, Ying,&Herzberg, Moshe.(2020).Exopolysaccharides may increase biocrust rigidity and induce runoff generation.JOURNAL OF HYDROLOGY,588.
MLA	Kidron, Giora J.,et al."Exopolysaccharides may increase biocrust rigidity and induce runoff generation".JOURNAL OF HYDROLOGY 588(2020).