[1]ZHENG Wei,WANG Zhongmei.Laboratorial Simulation Influences of Different Rainfall Intensities on Soil Erosion in Karst Area, China[J].Research of Soil and Water Conservation,2016,23(06):333-339.

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Laboratorial Simulation Influences of Different Rainfall Intensities on Soil Erosion in Karst Area, China

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 06 Page number: 333-339 Column: Public date: 2016-12-28

Title:: Laboratorial Simulation Influences of Different Rainfall Intensities on Soil Erosion in Karst Area, China

Author(s):: ZHENG Wei¹, WANG Zhongmei²; 1. Guizhou Monitoring Institute of Geological Environment, Guiyang 550000, China;
2. College of Resources and Environmental Engineering, Guizhou University, Guiyang 550044, China

Keywords:: karst area; rainfall intensity; runoff; soil erosion

CLC:: S157

DOI:: -

Abstract:: Simulated rainfall experiments were conducted to investigate the influence on soil erosion in Karst area, China. The results showed that:(1) the runoff occurring times of bare and plant cover area were shortening with the increase of rainfall intensities, and the runoff occurring times of bare and plant cover area under different rainfall intensities had the significant difference (p < 0.05); (2) the runoff ratios of bare and plant cover area increased with the increase of rainfall intensities and remained stable after 5~6 minutes, which showed in the order:bare area > plant cover area; (3) the sediment transport ratios of bare and plant cover area could be divided into four periods:rapid increase, fast decrease, decrease and stability, which showed in the sequence:bare area > plant cover area; (4) the total runoff and erosion of bare and plant cover area increased with the increase of rainfall intensities, which showed in the order:bare area > plant cover area, the total runoff of bare area under different rainfall intensities had a significant difference (p < 0.05), the total runoff and erosion of bare and plant cover area had no significant difference under intensities of 25 mm/h and 50 mm/h; (5) the contents of DP, K⁺ and SEK in bare area were much higher than those in the plant cover area (p < 0.05), while the content of SEP had no significant difference (p > 0.05); (6) There was a varying degrees of positive correlation between slope sediment yield and nutrients, and the correlation coefficients in the rainfall intensities of 75 mm/h and 100 mm/h were much better than 25 mm/h and 5 mm/h, and under the same rainfall intensities, the correlation coefficient of bare area was higher than plant cover area, which implied that plant cover could reduce the soil erosion and nutrient loss.

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