Quantifying the surface covering, binding and bonding effects of biological soil crusts on soil detachment by overland flow

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 城市与区域生态国家重点实验室

	Quantifying the surface covering, binding and bonding effects of biological soil crusts on soil detachment by overland flow
	Wang, Hao; Liu, Fa; Zhang, Guang-Hui; Sun, Fubao; Sun, Long
刊名	EARTH SURFACE PROCESSES AND LANDFORMS
	2017-12-01
卷号	42 期号:15 页码:2640-2648
关键词	Biological Soil Crusts Binding And Bonding Effects Contribution Rate Rill Erodibility Loess Plateau
英文摘要	Biological soil crusts (BSCs) have impacts on soil detachment process through surface covering, and binding and bonding (B&B) mechanisms, which might vary with successional stages of BSCs. This study was conducted to quantify the effects of surface covering, binding and bonding of BSCs on soil detachment capacity by overland flow in a 4m long hydraulic flume with fixed bed. Two dominant BSC types, developed well in the Loess Plateau (the early successional cyanobacteria and the later successional moss), were tested using natural undisturbed soil samples collected from the abandoned farmlands. Two treatments of undisturbed crusts and one treatment of removing the above-ground tissue of BSCs were designed for each BSC type. For comparison, bare loess soil was used as the baseline. The collected soil samples were subjected to flow scouring under six different shear stresses, ranging from 6.7 to 21.2Pa. The results showed that soil detachment capacity (D-c) and rill erodibility (K-r) decrease with BSC succession, and the presence of BSCs obviously increased the critical shear stress, especially for the later successional moss crust. For the early successional cyanobacteria crust, D-c was reduced by 69.2% compared to the bare loess soil, where 37.7% and 31.5% are attributed to the surface covering and B&B, respectively. For the later successional moss crust, D-c decreased by 89.8% compared to the bare loess soil, where 68.9% and 20.9% contributed to the surface covering and B&B, respectively. These results are helpful in understanding the influencing mechanism of BSCs on soil erosion and in developing the process-based erosion models for grassland and forestland. Copyright (c) 2017 John Wiley & Sons, Ltd.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39082]
专题	生态环境研究中心_城市与区域生态国家重点实验室
推荐引用方式 GB/T 7714	Wang, Hao,Liu, Fa,Zhang, Guang-Hui,et al. Quantifying the surface covering, binding and bonding effects of biological soil crusts on soil detachment by overland flow[J]. EARTH SURFACE PROCESSES AND LANDFORMS,2017,42(15):2640-2648.
APA	Wang, Hao,Liu, Fa,Zhang, Guang-Hui,Sun, Fubao,&Sun, Long.(2017).Quantifying the surface covering, binding and bonding effects of biological soil crusts on soil detachment by overland flow.EARTH SURFACE PROCESSES AND LANDFORMS,42(15),2640-2648.
MLA	Wang, Hao,et al."Quantifying the surface covering, binding and bonding effects of biological soil crusts on soil detachment by overland flow".EARTH SURFACE PROCESSES AND LANDFORMS 42.15(2017):2640-2648.