黄土与紫色土坡面侵蚀特征对比试验研究

采用人工模拟降雨试验,在相同试验条件下对黄土和紫色土坡面产流及产沙特征进行了对比研究.研究结果表明,黄土坡面属于超渗产流,坡面发育有较深的侵蚀沟;紫色土属于蓄满产流,坡面沟道不发育或发育微弱,且在相同条件下黄土坡面侵蚀量远大于紫色土坡面的侵蚀量.对比试验表明,在实施水保措施时,应结合土壤的结构和侵蚀特征选择适当的方案,以达到理想的防治效果.

Characteristics of Soil Erosion in Loess and Purple Soil

By the artificial rainfal experiment,the characteristics of surface runoff and sediment yield in loess and purple soil are contrastively studied under the same experimental conditions. Results show that loess slope belongs to the category of infiltration-excess runoff and deeper rills are developed on it. Purple soil belongs to the category of saturation-excess runoff,where rills are weakly developed or undeveloped. Erosion rate in loess is much greater than that in purple soil under the same conditions. When practicing soil conservation measurements,the appropriate methods combined with soil characteristics should be selected to achieve the ideal results.