The Grey Correlation Changes Between Rainfall Factors and Runoff and Soil Erosion from A Watershed in the Central Yunnan Province after Conservation Implementation

In order to control soil and water loss in the small Wang-Jia watershed in the central Yunnan Province,engineering,biological and crop cultivation measures have been implemented.The data of climate,hydrology and soil erosion have been collected.The correlation between rainfall factors and runoff and sediment are analyzed by using grew correlation analysis.Results show that incidence order between rainfall factors and runoff and sediment are stable after conservation implementation.In addition,PI_(30),PI_(60) and PI_(10) are main factors influencing runoff and soil erosion,and rainfall and intensity of rainfall is less,and duration of rainfall is the least.