Effects Of Farmers’ Planting Behavior On Soil And Water Loss

China is a country with serious soil and water loss in the world.As an important source of soil and water loss,farmland runoff erosion has attracted wide attention of scientists.It is of great significance to explore the effects of different planting practices on farmland runoff erosion and formulate corresponding factor values,which can provide reference for soil and water erosion prediction and optimization of existing soil and water conservation measures in China.Based on the full investigation of the existing literature,this paper collects the experimental results of runoff and sediment yield in farmland,explores the effects of different planting measures on the runoff and erosion of farmland,compares different measures with each other by Bayesian network meta-analysis,quantitatively analyses and ranks the degree of impact on soil erosion,so as to determine the characteristics of runoff and soil erosion under different planting measures.With the support of RUSLE model,the P value of the main planting measures in the Southern agricultural region of China was revised,and the soil and water conservation effects of different planting measures in the Southern agricultural region of China were quantitatively analyzed.The main conclusions are as follows:(1)The effects of different nitrogen rates and types of Fertilization on runoff and soil erosion are different.Runoff and soil erosion decrease first and then increase with the increase of nitrogen application.Reasonable nitrogen reduction measures are helpful to reduce runoff and soil erosion.The combination of farm manure and chemical fertilizer can effectively reduce the loss of runoff and soil erosion to a certain extent.Appropriate increase of the proportion of farm manure under the existing fertilization environment will help to reduce soil erosion.(2)The choice of tillage mode has a certain impact on Soil and water loss.No-tillage measures can effectively reduce runoff and soil erosion compared with tillage and less tillage.The difference of ridge direction has a significant impact on runoff and soil erosion,in which cross-slope ridge cultivation significantly reduces the loss of both,and straw returning to the field can reduce runoff and soil erosion to a certain extent.The effect of wheat straw on reducing runoff was the greatest,while other straw had the greatest effect on reducing soil erosion.(3)The P values of hedgerows,straw returning to the field,no-till,no-till + straw returning to the field,ridge and ridge and straw returning to the field were 0.48,0.56,0.58,0.05,0.40 and 0.03 respectively in the agricultural areas of southern China.The simulation effect of RUSLE was better.Compared with no water and soil conservation measures,cross slope)and the combination of the straw returned measures sediment reduction effect is best,reached 97%,no-till + straw also runs 95%,secondly is the cross slope),reduced 60% of soil erosion,hedgerow and straw counters-field measures were52% and 44% respectively,and finally is no-till,a 42% reduction in soil erosion.The model of ridge planting + straw returning to field has the highest water conservation benefit,which can be popularized in the agricultural areas of south China and promote the construction of soil and water conservation.