Soil Erosion And Management In South Fujian

By the investigation and analysis in the runoff plot tests and in the field,it is conducted systematically the research of the soil erosion rules and management measures in the South Fujian,the research is aim to iflustrate the raining characteristics,distribution orders and the relationship with the soil erosion in this area;found out the distribution rules of soil erosion together with the changes of the slope degree;explore the prediction methods for the soil erosion;seek for the relationship between the soil erosion and fertility degt-adation;and search for the measures of conserving the soil and water resources in the slope orchards,the result of the research indicates that in the South Fujian,the rainfall within one year appears the weak double peak type distribution with the great changes among years and districts.The nature raindrop distribution in this area follows the Best Model,however,there are differences among the model parameters.The diameter,kinetic energy and rainfall intensity of raindrops appear the functions relations.the relationship between the rainfall parameters and the soil erosion of the area changes following the changes of underlay situation.The essay identify the best and most simple and convinent arithmetic of the R value (Rainfall Erosion Force)in this area. It is considered that the distribution rules of one year & perennial R values is similar to the rainfall distribution with great swing of the distribution.The taxis of distribution rules is as follows:5-100 ,lO~l4o ,14-18 I 8~25o ~5O , ~25~ It is established the prediction model for soil erosion by the, application of quantitative theory,which is convinent to the general investigation arid monitoring of soil erosion.It is considered in the essay that soil erosion will consequentially result in the fertility degradation ,the combination measures of hillside ditch and green manure & forage coverage in the slope orchards will effectively conserve the slope land resources.