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Effects of shrub-grass patterns on soil detachment and hydraulic parameters of slope in the Pisha sandstone area of Inner Mongolia,China

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Journal of Forestry Research 2022年第2期33卷 519-528页

作者： Peng Chen Jianying Guo Tiegang Zhang Zhi Dong Hongli Li Suqian Qiu Xiaoxue Chen College of Forestry of Shandong Taishan Forestry Ecosystem Research StationAgricultural UniversityTai’an 271018People’s Republic of China Taishan Forestry Ecosystem Research Station Tai’an 271018People’s Republic of China Institute of Water Resources for Pastoral Area of the Ministry of Water Resources of China Hohhot 010020People’s Republic of China

The characteristics of soil holding capacity for different shrub-grass patterns are important to research the mechanisms regulating vegetation on *** objective of this study was to describe the characteristics and mecha-nisms of soil erosion and hydraulic parameters under differ-ent vegetation patterns in the Pisha sandstone area of Inner Mongolia on lands of 8°slope *** carried out field scouring experiments on five different shrub-grass patterns as treatments,viz no shrubs(GL),shrubs on the upper part of the slope(SU),middle part of the slope(SM)and lower part of the slope(SL).We designated bare slope(BL)as the *** employed three different water flow rates(15,20,30 L·min^(−1)).Our results showed that the contribution of plant root systems to slope sediment reduction ranged from 64 to 84%.The root systems proved to be the main contributing factor to reduction of erosion by *** relationship between soil detachment rate,stream flow power,and flow unit stream power under different scouring discharge rates showed that soil detachment declined in rank order as:BL>GL>SU>SM>*** SL pat-tern had the lowest soil detachment rate(0.098 g·m^(−2)·s^(−1)),flow stream power(2.371 W·m^(−2)),flow unit stream power(0.165 m·s^(−1))and flow shear stress(16.986 Pa),and proved to be the best erosion combating *** results of decision coefficient and path analysis showed that stream power was the most important hydraulic parameter for describing soil detachment *** combination of stream power and shear stress,namely Dr=0.1ω−0.03τ−0.56(R^(2)=0.924),most accurately simulated the soil detachment characteristics on *** study suggests that the risk of soil ero-sion can be reduced by planting shrub-grass mixes on these *** the conditions of limited water resources and economy,the benefit of sediment reduction can be maxi-mized by planting shrubbery on the lower parts of slopes.

关键词： Vegetation pattern soil detachment rate Hydraulic parameters soil erosion Caragana korshinskii

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STUDY ON THE DYNAMIC PROCESS OF RILL EROSION OF LOESS SLOPE SURFACE

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International Journal of Sediment Research 2001年第2期16卷 308-314页

作者： Zhanbin LI 1.2 Kexin LU2 and Wenfeng DING1 1 The State key Laboratory of Loess Plateau and Dry Land Farming, 712100, Yangling, Shaanxi, P.R.China. 2 Xi'an University of Technology, 710048, Xi'an, Shaanxi, P.R.China. The State key Laboratory of Loess Plateau and Dry Land Farming 712100 Yangling Shaanxi P.R.China Xi'an University of Technology 710048 Xi'an Shaanxi P.R.China. Xi'an University of Technology 710048 Xi'an Shaanxi P.R.China. The State key Laboratory of Loess Plateau and Dry Land Farming 712100 Yangling Shaanxi P.R.China

Rill erosion is a dominant process of morphological evolution of the Loess Plateau in China, and deliveries much loess sediment to rivers. Data from two flume experiments conducted on the bare and glass-covered beds indicated that the till flow develops into a series of rolling waves. The shear stress on the rill bed distributes unevenly both spatially and temporally. A new method based on the energy conservation law is proposed in this study. Thus the relationship between the runoff energy consumption from the interaction of water flow and slope bed and soil detachment is formulated. The results showed that the data for the soil detachment rate on slope （Dr） and the energy consumption of runoff （E1） fitted well with newly-developed function. The till erosion occurs when the runoff energy consumption exceeds a critical value.

关键词： soil detachment rate Pill erosion Runoff energy consumption

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