【摘要】 [目的]定量分析区域土壤侵蚀强度动态变化及其影响因素,为区域水土保持工作提供科学依据。[方法]基于3S技术,采用RUSLE模型计算吉林省梅河口市2010年和2017年的土壤侵蚀模数,并从土地利用类型、坡度和水土保持措施3个方面分析土壤侵蚀变化特征。[结果](1)梅河口市2010年、2017年的平均土壤侵蚀模数分别为698.75,678.25t/(km~2·a),土壤侵蚀状况有所改善。(2)梅河口市的土壤侵蚀与坡度和土地利用有关,>95%的土壤侵蚀分布在坡度<15°坡地,土地利用以耕地和林地为主的区域。(3)2010—2017年,水保项目实施区域的平均土壤侵蚀模数下降了154.08t/(km~2·a),土壤侵蚀量减少了2.65×10~4 t。[结论]水保项目的实施在改善水土保持功能上取得较大的成效,但治理后的区域仍存在一定强度的侵蚀,且土地利用的不利转变加重了区域土壤侵蚀。因此,区域水土流失治理工作需考虑多部门协同,从源头上遏制发生水土流失的不利因素。更多还原

【Abstract】 [Objective]To analyze the dynamic changes of regional soil erosion intensity and its driving factors,in order to provide scientific basis for regional soil and water conservation.[Methods]Based on 3 S technology,the revised universal soil loss equation(RUSLE)was used to estimate soil erosion modulus of Meihekou City,Jilin Province in 2010 and 2017.The changes of soil erosion were analyzed according to land use,slope and soil and water conservation measures.[Results](1) The average soil erosion modulus in 2000 and 2017 were 698.75 and 678.25 t/(km~2·a),respectively,indicating the improvement of soil and water conservation in Meihekou City.(2) The soil erosion in Meihekou City was correlated with the slope and land use.More than 95% of the soil erosion area were distributed in areas with slope<15°,and the land use was mainly cultivated land and forest land.(3) From 2010 to 2017,the mean soil erosion modulus decreased by 154.08 t/(km~2·a),and the amount of soil erosion decreased by 2.65×10~4 t in the soil and water conservation project implementation area.[Conclusion]The implementation of soil and water conservation project have improved soil and water conservation functions dramatically,but soil erosion is still existing in the treated area,and the improper transformation of land use type has aggravated regional soil erosion.Therefore,the cooperation works among different department need to be done to control the soil and water loss from the sources.更多还原