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[1]CHEN Cheng,HAO Zhibang.Research on Slope Runoff, Sediment and P and K Loss Characteristics on Slopes with Different Gradients Under Artificial Simulation of Rainfall[J].Research of Soil and Water Conservation,2017,24(02):70-76,83.

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Research on Slope Runoff, Sediment and P and K Loss Characteristics on Slopes with Different Gradients Under Artificial Simulation of Rainfall

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 24 Number of periods: 2017 02 Page number: 70-76,83 Column: Public date: 2017-04-28

Title:: Research on Slope Runoff, Sediment and P and K Loss Characteristics on Slopes with Different Gradients Under Artificial Simulation of Rainfall

Author(s):: CHEN Cheng¹, HAO Zhibang²; 1. Yellow River Conservancy Institute, Kaifeng, He’nan 475004, China;
2. River Management Office of Ziya River in Hebei Province, Hengshui, Hebei 053000, China

Keywords:: artificial simulation of rainfall; slope gradient; runoff and sediment; nutrient loss

CLC:: S157.1;X14

DOI:: -

Abstract:: Simulated rainfall experiments were conducted to investigate the effect of slope gradients on characteristics of runoff, sediment and nutrient losses. The results showed that the runoff occurring times shortened with the increase of slope gradients, and the initial runoff time ranged from 0.63 minute to 1.62 minutes, which indicated that the runoff time shortened with the increase of slope gradients. For the different slope gradients, the runoff intensity increased with the increase of rainfall time, which tended to be stable after 20 minute rainfall and followed the power function, while the average infiltration rate decreased with the increase of rainfall time, which tended to be stable after 20 minute rainfall and followed the logarithmic function. Sediment yields on slope increased with the increase of slope gradients, in 0~20 minutes, the sediment yields on the slope increased with the increase of rainfall time, which were the highest during 20~40 minutes, and tended to be stable after 40 minutes. The contents of DP, K⁺, SEP and SEK increased with the increase of rainfall time. There were the varying degrees of positive correlation between sediment yields and nutrient contents on the slope, and the correlation coefficients in the slope gradients of 20°, 25° and 30° were much higher than those in the slope gradients of 5°, 10° and 15°, which implied that sediment yield on the slope could cause the increase of various kinds of nutrients, while sediment yields and nutrient contents on the slope had no further correlation with the increase of slope gradient.

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