土石混合紫色土坡面水文过程的实验研究

发布时间：2018-06-22 15:23

本文选题：碎石 + 产流　；参考：《山地学报》2017年04期

【摘要】：土壤中的碎石改变了均质土壤的容重、孔隙度与孔径分布等物理性质,从而对土壤水文与侵蚀过程造成影响。该研究在室内人工模拟降雨条件下,对6种不同碎石体积含量(0,5%,10%,20%,30%,40%)紫色土坡面的水文过程进行了模拟。结果表明,径流系数与碎石含量之间差异显著(F=115,P0.01)且呈显著正相关关系;土壤湿润锋随着碎石含量的增大呈增加的趋势;不同碎石含量的土壤坡面起始产流时间差异显著(F=208,P0.01),且产流时间随碎石含量的增加而减小;碎石含量为20%时,土壤平均产流量最高,超过20%时,产流量反而降低;但碎石含量对径流流速没有显著影响。该研究结果可以为碎石含量在紫色土中的作用机理提供理论基础,同时为紫色土区土壤资源的合理利用提供科学依据。
[Abstract]:The gravel in soil changes the physical properties of homogeneous soil, such as bulk density, porosity and pore size distribution, thus affecting the soil hydrology and erosion process. In this study, the hydrological process of purple soil slope surface was simulated under the condition of artificial rainfall in laboratory, and six different kinds of gravel volume content (0 ~ 5 ~ 10 ~ 10 ~ 20 ~ 30 ~ 40%) were simulated. The results showed that there was a significant difference between runoff coefficient and gravel content (F _ (115) P _ (0.01) and there was a significant positive correlation between runoff coefficient and gravel content, and the soil wetting front showed an increasing trend with the increase of gravel content. The initial runoff production time of soil slope with different crushed stone content was significantly different (FF208U P0.01), and the runoff time decreased with the increase of gravel content, and the average soil runoff was the highest when the gravel content was 20g, but decreased when the gravel content was more than 20g. However, the gravel content has no significant effect on the runoff velocity. The results can provide a theoretical basis for the action mechanism of gravel content in purple soil and scientific basis for the rational utilization of soil resources in purple soil area.
【作者单位】：西南大学资源环境学院三峡库区生态环境教育部重点实验室;中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室;
【基金】：国家自然科学基金青年项目(41401298) 中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金项目(K318009902-1418) 西南大学大学生科技创新“光炯”培育项目(20140105)~~
【分类号】：S157.1

【相似文献】