基于RWEQ模型的土壤颗粒含量与土壤可蚀性关系研究
Study on the Relationship between Soil Particle Content and Soil Erodibility Based on RWEQ Model

本文为研究土壤颗粒含量与土壤可蚀性因子EF值的关系，依据RWEQ模型，构建了各土壤颗粒含量分别从1%到98%以及粉粒、粘粒和砂粒含量为1%、2%、10%、30%、50%、70%、90%的整数组合数据集，计算了有机质含量为2%的前提条件下的土壤可蚀因子EF值，分析了不同土壤颗粒含量条件下土壤可蚀因子变化以及其两者间的相关性。结果表明：1) 土壤砂粒含量越高，土壤可蚀性因子EF值越大，说明砂粒含量与土壤可蚀性因子EF值呈正相关；2) 当土壤粘粒含量较低时，向土壤中加入粘土颗粒，土壤可蚀性降低速度显著加快，说明粘粒含量越高，土壤抗侵蚀能力提升越快；3) 影响土壤可蚀性的主要因子为土壤砂粒含量与土壤粘粒含量的比值(Sa/Cl)，其比值越大，土壤可蚀性越低，控制好粘土与砂粒的比例，可有效提高土地抗侵蚀能力。
In order to study the relationship between soil particle content and soil erodibility factor EF value, based on the RWEQ model, the integer combination data sets of soil particle content from 1% to 98% and silt, clay and sand content of 1%, 2%, 10%, 30%, 50%, 70% and 90% were constructed in this paper. The soil erodibility factor EF value under the premise of the organic matter content of 2% was calculated, and the changes in soil erodibility factor under different soil particle contents and the correlation between them were analyzed. The results showed that: 1 ) The higher the soil sand content, the greater the soil erodibility factor EF value, indicating that the sand content was positively correlated with the soil erodibility factor EF value; 2 ) When the soil clay content was low, adding clay particles to the soil, the soil erodibility decreased significantly faster, indicating that the higher the clay content, the faster the soil erosion resistance increased; 3 ) The main factor affecting soil erodibility is the ratio of soil sand content to soil clay content (Sa/Cl). The greater the ratio, the lower the soil erodibility. Controlling the ratio of clay to sand can effectively improve soil erosion resistance.