摘要
在RS和GIS技术支持下生成的三峡库区2000和2009年土壤侵蚀强度类型图的基础上,运用分形理论分析三峡库区土壤侵蚀的空间格局变化。结果表明:1)在各侵蚀强度类型中,微度侵蚀面积最大且呈显著增加趋势,而其他侵蚀类型的面积均呈减小趋势;2)土壤侵蚀空间格局存在分形特征,近10年间,各侵蚀强度类型的斑块镶嵌结构复杂度变化不一,其中微度、轻度侵蚀类型斑块结构的复杂度呈减小趋势,而中度以上侵蚀类型斑块结构的复杂度呈增加趋势;3)剧烈侵蚀类型的斑块镶嵌结构稳定性均高于其他侵蚀类型,稳定性指数在2000和2009年分别为0.489 2和0.463 6,时间变化上,除了微度和轻度侵蚀类型外,库区其他侵蚀强度类型的空间格局稳定性指数均呈减小趋势。
Using RS and GIS technology,the distribution of soil erosion intensity in Three Gorges Reservoir Area was revealed in 2000 and 2009 respectively.The variation of spatial pattern of soil erosion were analyzed by using fractal theory.The results showed that： 1） The area of slight erosion was the largest in the study area with a significant increase from 2000 to 2009,vice versa with a decrease in other erosion grades;2） The spatial pattern of soil erosion in this area showed fractal characteristics.The complexity of spatial pattern in all erosion grades had different changes during last 10 years,decreasing in slight and low erosion grades and increasing in the grades over mediate erosion;3） The stability of spatial pattern was the highest in the extreme erosion grade with values of 0.4892 and 0.4636 in 2000 and 2009 respectively.Except the slight and low erosion grades,the spatial structure stability of all erosion grades declined gradually.
出处
《中国水土保持科学》
CSCD
2011年第2期47-51,56,共6页
Science of Soil and Water Conservation
基金
国家科技支撑计划项目"三峡库区景观生态防护林体系构建技术试验示范"(2006BAD03A1301)
"林业生态工程生态效益监测评价"(2006BAD03A0701)
长江三峡库区(秭归)森林生态定位站资助
关键词
土壤侵蚀
空间格局
分形理论
三峡库区
soil erosion
spatial pattern
fractal theory
Three Gorges Reservoir Area
