区域水土流失面积与平均土壤侵蚀模数关系探究

The Relationship Between Regional Soil Erosion Area and Average Soil Erosion Modulus

采用黄河流域(片)国家级防治区中部分县级行政区2020年度水土流失动态监测成果及对应的平均土壤侵蚀模数,建立了不同县级行政区县域面积、各侵蚀强度等级面积与其平均土壤侵蚀模数之间的关系,进而推算不同区域的土壤流失量。结果表明,临界土壤侵蚀模数与平均土壤侵蚀模数之间存在较好的线性关系。根据建立的拟合关系,推算出不同时期黄土高原多沙区土壤流失量,1990—2019年黄土高原多沙区累积保土量为213.44亿t。

By using the dynamic monitoring results of soil and water loss and average soil erosion modulus in 2020 of some county-level administrative regions in the national prevention and control area of the Yellow River basin,the paper established the relationship between the county area and the area of each erosion intensity grade with its average soil erosion modulus of different county administrative regions,then calculated the soil loss in different regions.The outcomes show that there is a good linear relationship between the critical soil erosion modulus and the average soil erosion modulus.According to the established fitting relationship,it calculates the amount of soil loss in sandy area of loess plateau in different periods.In the period of 19902019,the cumulative soil conservation in sandy area of loess plateau is 21.344 billion tons.