土壤理化性质与土壤溅蚀速率的相关性研究

发布时间：2018-03-16 04:04

  本文选题：土壤溅蚀　切入点：土壤理化性质　出处：《水土保持研究》2017年03期 　论文类型：期刊论文

【摘要】：土壤溅蚀是土壤侵蚀的初始阶段,是降雨雨滴直接打击土壤表层引起的土壤颗粒分散和位移发生的过程。为研究土壤理化性质与土壤溅蚀速率的相关性,研究通过人工模拟降雨溅蚀试验测定土壤溅蚀速率,运用SPSS 20.0软件,对土壤理化性质与土壤溅蚀速率进行了Pearson相关系数分析。结果表明:土壤渗透性、分散率、团聚度和土壤粒级与土壤溅蚀速率相关性最大。土壤的渗透系数在整个降雨历时阶段对土壤的溅蚀速率一直呈现负影响。分散率在降雨历时为15min时对土壤溅蚀速率呈显著负影响。团聚度对土壤溅蚀速率的影响由T=15min时的显著正相关变成T=20min时的极显著正相关。土壤粒级和土壤溅蚀速率相关性很大,且关系较为复杂。相较于其他4种粒级中,粒级范围在D0.002mm的土壤颗粒对土壤溅蚀速率影响最大,且在降雨历时为15~20min时,对土壤溅蚀速率皆有显著正相关性。另外,粒级范围在0.2≤D2mm和0.02≤D0.2mm的土壤颗粒分别在T=15min和T=20min时对土壤溅蚀速率有显著负相关性。土壤粒级对土壤溅蚀速率的相关性随降雨历时的变化可能与土壤结皮有关。
[Abstract]:Soil splash erosion is the initial stage of soil erosion. It is the process of soil particle dispersion and displacement caused by raindrops hitting the surface of soil directly. In order to study the correlation between soil physical and chemical properties and soil splash erosion rate. The soil splash rate was measured by artificial simulated rainfall splash test. The Pearson correlation coefficient between soil physical and chemical properties and soil splash rate was analyzed by using SPSS 20.0 software. The results showed that the soil permeability and dispersion were obtained. The correlation between soil splash erosion rate and aggregate degree and soil particle size was the greatest. The soil permeability coefficient had a negative effect on soil splash erosion rate in the whole rainfall duration stage, and the dispersion rate had a negative effect on soil splash erosion rate when the rainfall duration was 15 min. The effect of agglomeration on soil spatter rate was significantly negative. The significant positive correlation of soil spatter erosion rate increased from 15 min to 20 min, and there was a significant correlation between soil particle size and soil splash rate. Compared with the other four grain classes, soil particles of D 0.002 mm had the greatest effect on the soil splash erosion rate, and had a significant positive correlation with the soil splash erosion rate when the rainfall duration was 15 ~ 20 min. In addition, when the rainfall duration was 15 ~ 20 min, there was a significant positive correlation between the soil spatter erosion rate and the soil splash erosion rate. Soil particles with grain size of 0.2 鈮，

本文编号：1618224