中山大学学报（自然科学版）2018，Vol.57Issue(2)：32-41,10.DOI:10.13471/j.cnki.acta.snus.2018.02.004
土地覆盖类型变化对梯度发展流域的土壤侵蚀动态影响
Dynamic impacts of land-cover change on soil erosion in a gradient development basin
摘要
Abstract
This study used GIS technique and RUSLE model to analyze the dynamic impacts on soil ero-sion in the Dongjiang river basin, a gradient development basin, based on the land-cover data in years 1990,2000 and 2010.The results showed that the land-cover in the downstream areas presented a large variation with a large number of paddy field,nonirrigated farmland,forestland and grassland converting to urban land,construction land and garden plot.The average soil erosion amounts reach 15.22 t/(hm2· a),15.41 t/(hm2· a)and 15.47 t/(hm2· a),all of which belong to Level II but increased over the time.The percentage of the erosion areas belonging to Levels I-II ranges 90.95%to 91.26%.The level change of soil erosion is not significant:approximately 24328 km2(91.14%)areas maintained the origi-nal levels, but approximately 2365 km2(8.86%)changed; among the changed areas, approximately 1286 km2(4.82%)was converted from lower levels to higher levels, but approximately 1079 km2 (4.04%)was converted from higher levels to lower levels.The spatial distribution and its dynamic vari-ation matched well with the gradation development of social economy,which showed an increasing trend from the upstream to downstream.关键词
侵蚀/水土保持/降雨/RUSLE/GIS/东江流域Key words
erosion/soil conservation/precipitation/RUSLE/GIS/Dongjiang River basin分类
农业科技引用本文复制引用
苏春生,吴孝情,陈晓宏,赖成光,杨冰,张力澜..土地覆盖类型变化对梯度发展流域的土壤侵蚀动态影响[J].中山大学学报（自然科学版）,2018,57(2):32-41,10.基金项目
国家自然科学基金(91547202,51210013,51479216,51509040) （91547202,51210013,51479216,51509040）
广东省水利科技创新项目(2016-25, 2015-17) （2016-25, 2015-17）
