Study on the Relationship Between Rainfall Runoff and Soil Erosion of Slopeland in Gullied Rolling Loess Area
Based on the data of 27 erosive rainfalls from 2009 to 2012 of four farmland runoff plots in Anjiapo small watershed,this paper analyzed the relationship characteristics of the rainfall runoff and the soil erosion in gullied rolling loess area. The results show that rainfall runoff and soil erosion of cultivated land are proportional to the gradient variables under the same rainfall conditions. The erosive rainfall distributions are extremely uneven and show obvious distribution characteristics of one-peak in flood seasons. Leading to the soil and water loss of farmland rainfall about the runoff level is heavy rain in gullied rolling loess area. Especially,the erosive rainfall in July is the largest.Therefore,July becomes the most critical period to prevent and control the soil erosion of farmland in the gullied rolling loess area.