内蒙古多伦县土地沙漠化景观格局变化特征

利用景观分析软件Fragstats 3.3和内蒙古多伦县1960、1975、1987、1995、2000、2005年6期遥感影像解译结果,分析了1960—2005年间土地沙漠化景观格局变化.结果表明:1960—1995年间研究区土地沙漠化面积呈先增后减趋势,总沙漠化面积增加212.70km2,沙漠化斑块数先增多后减少,景观多样性和均匀性上升,轻度、中度、重度沙漠化斑块形状趋向简单;1995—2005年间研究区沙漠化斑块数大幅增加,景观多样性和均匀性下降,轻度、中度、重度沙漠化斑块形状趋向复杂;严重沙漠化斑块形状在1960年以后一直趋向复杂化.整个景观在研究期间表现为完整-破碎-完整-破碎的趋势,由轻度到严重沙漠化,其景观类型的破碎化程度逐渐降低.

Dynamic changes of landscape pattern during desertification in Duolun County of Inner Mongolia

By using landscape analyzing software Fragstats 3.3 and the interpretation results of remote-sensing images of 1960,1975,1987,1995,2000 and 2005,this paper analyzed the dynamic changes of landscape pattern during the desertification in Duolun County of Inner Mongolia in 1960-2005.The results showed that in 1960-1995,the desertification area appeared a tendency of increasing first and decreasing then,with a total increase of 212.7 km2.The numbers of desertification landscape patches decreased after an initial increase,landscape diversity and evenness increased,and the shapes of light-,moderate-,and heavy desertification patches tended to be simplex.From 1995 to 2005,the numbers of desertification patches increased greatly,landscape diversity and evenness decreased,and the shapes of light-,moderate-,and heavy desertification patches tended to be complex.Since 1960,the shapes of severe desertification patches had been inclined to complication.In the study period,the whole desertification landscape showed a trend of integrity-broken-integrity-broken,and the broken degree of the patch types of desertification landscape was gradually from light down to severe.