Effects of moss-dominated biocrusts on soil detachment by overland flow in the Three Gorges Reservoir Area of China

doi:10.1007/s11629-020-6200-6

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > Journal of Mountain Science > Journal of Mountain Science-2020 > Vol17 No.10

	Effects of moss-dominated biocrusts on soil detachment by overland flow in the Three Gorges Reservoir Area of China
	Zhang Guan-hua; Ding Wen-feng; Pu Jian; Li Jian-ming; Qian Feng; Sun Bao-yang
刊名	JOURNAL OF MOUNTAIN SCIENCE
	2020
卷号	17 期号:10 页码:2418-2431
关键词	Soil detachment Soil erosion resistance Rill erodibility Biological soil crusts Yangtze River
ISSN号	1672-6316
DOI	10.1007/s11629-020-6200-6
文献子类	Article
英文摘要	Biological soil crusts (biocrusts) are important landscape components that exist in various climates and habitats. The roles of biocrusts in numerous soil processes have been predominantly recognized in many dryland regions worldwide. However, little is known about their effects on soil detachment process by overland flow, especially in humid climates. This study quantified the effects of moss-dominated biocrusts on soil detachment capacity (D-c) and soil erosion resistance to flowing water in the Three Gorges Reservoir Area which holds a subtropical humid climate. Potential factors driving soil detachment variation and their influencing mechanism were analyzed and elucidated. We designed five levels of coverage treatments (1%-20%, 20%-40%, 40%-60%, 60%-80%, and 80%-100%) and a nearby bare land as control in a moss-dominated site. Undisturbed soil samples were taken and subjected to water flow scouring in a hydraulic flume under six shear stresses ranging from 4.89 to 17.99 Pa. The results indicated that meanD(c)of moss-covered soil varied from 0.008 to 0.081 kg m(-2)s(-1), which was 1.9 to 21.0 times lower than that of bare soil (0.160 kg m(-2)s(-1)). Rill erodibility (K-r) of moss-covered soil ranged from 0.0095 to 0.0009 s m(-1), which was 2 to 20 times lower than that of bare soil (0.0187 s m(-1)). Both relative soil detachment rate andK(r)showed an exponential decay with increasing moss coverage, whereas the critical shear stress (tau(c)) for different moss coverage levels did not differ significantly. Moss coverage, soil cohesion, and sand content were key factors affectingD(c), while moss coverage and soil bulk density were key factors affectingK(r). A power function of flow shear stress, soil cohesion, and moss coverage fitted well to estimateD(c)(NSE=0.947). Our findings implied that biocrusts prevented soil detachment directly by their physical cover and indirectly by soil properties modification. Biocrusts could be rehabilitated as a promising soil conservation measure during ecological recovery to enhance soil erosion resistance in the Three Gorges Reservoir Area.
电子版国际标准刊号	1993-0321
语种	英语
WOS记录号	WOS:000578876400008
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/50617]
专题	Journal of Mountain Science_Journal of Mountain Science-2020_Vol17 No.10
推荐引用方式 GB/T 7714	Zhang Guan-hua,Ding Wen-feng,Pu Jian,et al. Effects of moss-dominated biocrusts on soil detachment by overland flow in the Three Gorges Reservoir Area of China[J]. JOURNAL OF MOUNTAIN SCIENCE,2020,17(10):2418-2431.
APA	Zhang Guan-hua,Ding Wen-feng,Pu Jian,Li Jian-ming,Qian Feng,&Sun Bao-yang.(2020).Effects of moss-dominated biocrusts on soil detachment by overland flow in the Three Gorges Reservoir Area of China.JOURNAL OF MOUNTAIN SCIENCE,17(10),2418-2431.
MLA	Zhang Guan-hua,et al."Effects of moss-dominated biocrusts on soil detachment by overland flow in the Three Gorges Reservoir Area of China".JOURNAL OF MOUNTAIN SCIENCE 17.10(2020):2418-2431.