滇东北山区坡耕地土壤流失方程研究

Study on Soil Loss Equation of Cultivated Slopeland in Northeast Mountain Region of Yunnan Province

滇东北山区是云南省“长江上游水土保持重点防治工程”治理计划的重点区域，该区域水土流失的主体是坡耕地。该项研究通过对３２个试验小区连续３ａ实测数据的统计分析，建立了滇东北山区坡耕地土壤流失方程Ａ＝ＲＫＬＳＣＰ；并确定了方程中诸因子的求算方法和数值，以及滇东北山区土壤允许流失量，为方程的应用提供了基本的技术数据。并进行了方程的验证，方程计算值与实测值的误差在６％以下，表明该方程在实际应用中具有很大的可靠性。该方程的建立，为滇东北山区预测预报土壤侵蚀，制定土地合理利用规划方案和水土保持措施。

The northeast mountain region of Yunnan province is a major region of soil and water conservation of the upper Yangtze river in Yunnan province,the chief part of soil erosion in this region is cultivated slopeland. By means of the statistical analysis of the experimental data measured on 32 experimental spots over three years continuously, the soil loss equation of cultivated slopeland in northeast mountain region of Yunnan province has been developed as follows: A=R·K·LS·C·P. The algorithm and data for every factor in the equation as well as the capacity for permitable loss of soil in northeast mountain region of Yunnan province have been determined, which provided the fundamental technological data for future use of the equation. At the same time, the author has made a test to the equation, the results indicate that the error of data by calculating does not exceed 6% when compared with the practical experimental data, which proved the equation may be very reliable in future application. The development of the equation may provide a series of dependable scientific methods and bases for predicting soil erosion, mapping out the rational utilization planning of land and the countermeasures of soil and water conservation, and carrying out the strategy of sustainable development in northeast mountain region of Yunnan province.