用人工模拟降雨研究不同土壤类型的产沙特征

发布时间：2018-06-14 17:25

本文选题：人工模拟降雨 + 土壤类型　；参考：《安徽农业大学学报》2017年03期

【摘要】：以新疆伊宁、玛纳斯县3种土壤类型为研究材料,采用室外人工模拟降雨试验、野外调查采样与土壤样品室内理化性质测定相结合的方法,比较了相同降雨条件下3种类型土壤的坡面侵蚀特征。结果表明:(1)土壤的颗粒组成和有机质含量是影响土壤可蚀性差异的主要因素。土壤中粉粒的含量越高,其含沙量、可蚀性K值愈大,越易发生侵蚀;土壤中粘粒含量越高,土壤含沙量、可蚀性K值越小,越易抵抗侵蚀。(2)相关性分析发现土壤的径流速率和产沙量的相关系数为0.56,没有显著的相关性。(3)土壤的有机质和累积含沙总量相关性分析,发现两者显著相关,相关系数为0.73。(4)通过打破土壤结构体,发现2 mm结构体土壤中,灰钙土的产流速率、产沙量及可蚀性K值均最小;2 mm土壤结构体中,棕钙土的产流速率、产沙量及可蚀性K值均最小,且2 mm土壤结构体比2 mm结构体的土壤抵抗侵蚀的能力大。
[Abstract]:Three kinds of soil types in Yining and Manas County of Xinjiang were used as the research materials. The outdoor simulated rainfall test was used. The method of field investigation and sampling was combined with the indoor physical and chemical properties determination of soil samples. The slope erosion characteristics of three types of soils under the same rainfall conditions were compared. The results showed that the particle composition and organic matter content of the soil were the main factors affecting the difference of soil erodibility. The higher the content of silt in the soil, the higher the sediment content, the greater the K value of erodibility, the more susceptible to erosion, the higher the clay content in the soil, the smaller the soil sediment content and the erodibility K value. The correlation coefficient between runoff rate and sediment yield was 0.56, and there was no significant correlation between soil organic matter and accumulated sediment content. The correlation coefficient is 0.73.4) by breaking the soil structure, it is found that the runoff rate, sediment yield and erodibility K value of the lime calcium soil in the soil with 2 mm soil structure are the lowest, and the runoff rate of the brown calcium soil is the lowest in the soil structure of 2 mm soil. The sediment yield and erodibility K were the smallest, and the soil structure of 2 mm was more resistant to erosion than that of 2 mm.
【作者单位】：新疆农业大学林学与园艺学院;新疆农业大学草业与环境科学学院;新疆农业大学林业研究所;
【基金】：国家科技支撑计划项目(2014BAC15B03) 新疆农业大学大型仪器设备新功能开发项目共同资助
【分类号】：S157.1

【相似文献】