干旱区生态环境知识资源中心(Arid): Biocrust islands enhance infiltration, and reduce runoff and sediment yield on a heavily salinized dryland soil

Arid

DOI	10.1016/j.geoderma.2021.115329
	Biocrust islands enhance infiltration, and reduce runoff and sediment yield on a heavily salinized dryland soil
	Kakeh, Jalil; Gorji, Manouchehr; Mohammadi, Mohammad Hossein; Asadi, Hossein; Khormali, Farhad; Sohrabi, Mohammad; Eldridge, David J.
通讯作者	Kakeh, J (corresponding author), Univ Tehran, Soil Sci Dept, Karaj, Iran.
来源期刊	GEODERMA
ISSN	0016-7061
EISSN	1872-6259
出版年	2021
卷号	404
英文摘要	Salinity and sodicity are major forms of land degradation in drylands worldwide, reducing soil function, and threatening pastoral livelihoods. Dryland soils are often dominated by biocrusts, surface aggregations of lichens, bryophytes, fungi and other minute organisms that stabilize surface soils. Biocrusts could have a role in maintaining hydrological functions in heavily salinized areas, but there have been few studies, and the mechanisms are poorly understood. We tested whether biocrust mosses and lichens enhanced infiltration, and reduced runoff and sediment yield, on biocrusted islands scattered among extensive patches of bare highly saline soils in northeaster Iran. Biocrusted soils had greater cumulative infiltration and hydraulic conductivity, less runoff, which commenced later, and lower sediment yields than bare soils. The water content of biocrusted soils was greater than bare soils, but only at low matric potentials. Biocrusted surfaces were alkaline, more sandy, had lower levels of sodium, chloride, and calcium-plus-magnesium ions, and a lower sodium absorption ratio than bare soils. Structural equation modelling showed that increasing salinity was associated with a suppression of the negative effect of biocrusts on runoff. Potential mechanisms for reduced runoff likely relate to enhanced soil aggregation and porosity of biocrusted soils leading to greater retention of soil water content at low matric potentials, as well as an ability of mosses and lichens to capture and store surface water or to permit infiltration into the uppermost surface layers. Overall, our findings reveal a strong association between moss- and lichendominant biocrusts and soil hydrological processes, and suggest that these crusts play an important role in maintaining hydrological function in heavily salinized soils.
英文关键词	Biological soil crusts Hydrological function Runoff Sediment yield Soil salinity
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000700886000034
WOS关键词	SALT STRESS ; WATER INFILTRATION ; SURFACE CRUSTS ; DESERT ; TOLERANCE ; RESPONSES ; DYNAMICS ; RAINFALL ; CYANOBACTERIAL ; HALOPHYTES
WOS类目	Soil Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363386
作者单位	[Kakeh, Jalil; Gorji, Manouchehr; Mohammadi, Mohammad Hossein; Asadi, Hossein] Univ Tehran, Soil Sci Dept, Karaj, Iran; [Khormali, Farhad] Gorgan Univ Agr Sci & Nat Resources, Soil Sci Dept, Gorgan, Golestan, Iran; [Sohrabi, Mohammad] Iranian Res Org Sci & Technol, Biotechnol Dept, Tehran, Iran; [Eldridge, David J.] Univ New South Wales, Ctr Ecosyst Sci, Sch Biol Earth & Environm Sci, Sydney, NSW 2052, Australia
推荐引用方式 GB/T 7714	Kakeh, Jalil,Gorji, Manouchehr,Mohammadi, Mohammad Hossein,et al. Biocrust islands enhance infiltration, and reduce runoff and sediment yield on a heavily salinized dryland soil[J],2021,404.
APA	Kakeh, Jalil.,Gorji, Manouchehr.,Mohammadi, Mohammad Hossein.,Asadi, Hossein.,Khormali, Farhad.,...&Eldridge, David J..(2021).Biocrust islands enhance infiltration, and reduce runoff and sediment yield on a heavily salinized dryland soil.GEODERMA,404.
MLA	Kakeh, Jalil,et al."Biocrust islands enhance infiltration, and reduce runoff and sediment yield on a heavily salinized dryland soil".GEODERMA 404(2021).