川中丘陵区紫色土坡耕地土壤侵蚀特征

通过径流小区定位观测,研究了川中丘陵区坡耕地土壤侵蚀特征。结果表明,坡面径流量和土壤侵蚀量年际间存在差异;随着坡度的增加,坡面径流量和土壤侵蚀量呈增加的趋势。多元回归分析表明,降雨量与坡面径流深、土壤侵蚀量之间存在显著的线性关系;而降雨强度、降雨历时与土壤侵蚀量分别存在着显著的幂函数和二次函数关系。主成分分析表明,降雨量和降雨强度为坡耕地主要的土壤侵蚀因子,降雨历时对土壤侵蚀的贡献率随坡度的增加逐渐加强。

Characteristics of Soil Erosion on Sloping Field in the Central Hilly Areas of Sichuan

The study was carried out to do research on the characteristics of soil erosion in sloping fields at the central hilly areas of Sichuan by observing the water and soil loss of runoff observation field.The results indicated that the runoff and soil erosion were different between different years.Runoff and soil erosion increased with the rise of slope.Multiple regression analysis showed that significant liner relationship existed between rainfall and runoff depth,soil erosion.However,the significant power and quadratic relationships were found between rainfall intensity and soil erosion,rainfall duration and soil erosion respectively.The principal component analysis manifested that rainfall and rainfall intensity were the major factors for soil erosion.The effect degree of rainfall duration on soil erosion was enhanced with the rise of slope.