Analysis on characteristics of precipitation and runoff production on slop land at Western Yunnan Plateau in China

摘要

At western Yunnan plateau in China, the characteristics of precipitation and runoff production on slop lands can provide a foundation data for vegetation recovery research and slop management. Characteristics of precipitation and runoff production on slop land were studied with the method of runoff plots. It showed that the distribution of one year rainfall is uneven; the rain keeps on heavy in the rainy season and results in water and soil erosion. Based on the three characteristic values of rainfall: precipitation, rainfall intensity and duration, the rainfalls in the study area were classified into three regimes through K-means clustering in SPSS 15.0 software, The order of runoff coefficients induced by rainfall was regime A > regime B > regime C. However， The order of scale effect on runoff induced by rainfall was regime C > regime B > regime A.