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[1]LI Qiang,ZHANG Zheng,SUN Hui,et al.A New Modified Method for Calculation of Soil Disintegration Rate[J].Research of Soil and Water Conservation,2015,22(06):344-348.

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A New Modified Method for Calculation of Soil Disintegration Rate

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 22 Number of periods: 2015 06 Page number: 344-348 Column: Public date: 2015-12-28

Title:: A New Modified Method for Calculation of Soil Disintegration Rate

Author(s):: LI Qiang¹, ZHANG Zheng², SUN Hui², XU Weizhou¹; 1. Yulin University, Yulin, Shaanxi 719000, China;
2. Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China

Keywords:: soil disintegration rate; gravity; buoyancy; calculation method

CLC:: S157.1

DOI:: -

Abstract:: To obtain a more accurate calculation method of soil disintegration rate and evaluate soil erosion degree correctly. In the present paper, two calculation methods of soil disintegration rate are compared by focusing on the force analysis of soil sample in static water. The soil samples were taken from a slope farmland in Zizhou. Results showed that soil moisture content of samples has the significant influence on the process of disintegration when using the method of tension meter to determine the soil disintegration rate. The results of soil disintegration rate under the method of modified tension meter are in accordance with the theories that have been reported and the variability also reduces to some extent. The dynamic changes of buoyancy should be taken into account when calculating soil disintegration rate. Thus, it suggests that soil disintegration rate test should follow steps such as: (1) collecting undisturbed soil sample with plastic film sealing using the square-ring knife; (2) bringing soil sample back to laboratory, weighing soil sample, and matting the filter paper, then, putginf it in a plate with shallow water infiltration of soil from bottom to top, until the soil was saturated; (3) placing saturated soil samples in a hob on stage again after removing gravity water, and weighing soil sample again; (4) removing the square-ring knife gently, putting soil sample in the stage of the tension gauge sheet; (5) its calculation should be multiplied by the correction coefficient of k.

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