[1]GAO Yan,ZHENG Fen-li,WANG Bin,et al.Effects of Soil Crust on Runoff and Sediment on Hillslope in Black Soil Region[J].Research of Soil and Water Conservation,2014,21(04):17-20.

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Effects of Soil Crust on Runoff and Sediment on Hillslope in Black Soil Region

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 21 Number of periods: 2014 04 Page number: 17-20 Column: Public date: 2014-08-28

Title:: Effects of Soil Crust on Runoff and Sediment on Hillslope in Black Soil Region

Author(s):: GAO Yan¹, ZHENG Fen-li^1,2, WANG Bin¹, LI Gui-fang², ZHANG Jiao¹, JIANG Yi-liang¹; 1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China

Keywords:: black soil region; soil crust; slope gradient; runoff; sediment

CLC:: S157.1

DOI:: -

Abstract:: Soil surface crust has great impacts on hillslope erosion process. Simulated rainfall experiments were conducted to investigate the effect of soil crust on runoff and sediment yield on hillslope in the black soil region. The experimental design included two kinds of soil surface (crust and non-crust), one rainfall intensity (60 mm/h) and two slope gradients (5° and 10°). Results showed that the runoff occurrence with soil crust treatment was earlier than that of non-crust treatment, but runoff rate was similar for both soil surface treatments. Compared to the non-crust treatment, the sediment yield on 5° slope with crust decreased by 54%; the sediment yield of 10° slope decreased by 40% when the soil crust existed in the process of rainfall because soil crust has the function of restraining sediment generation; but it increased by 46% after the soil crust was broken. The total sediment yield on 10° slope with initial crust increased by 16% compared to that in the non-crust treatment in the duration of the simulated rainfall. Under the experimental conditions, this study results showed that slope gradient was the key factor that soil crust affected soil erosion.

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