内江市土地利用动态变化特征研究

根据内江市1997-2005 年土地利用详查和变更数据,运用数理统计方法研究该市土地利用动态变化特征,结果表明:土地利用数量总体上呈现耕地、未利用地、水域面积减小,而园地、林地、牧草地、建设用地面积增大的趋势;各区县土地利用变化区域差异明显,且变化幅度大于内江市土地利用变化平均幅度;全市除市中区土地利用处于调整期以外,其他区县土地利用均处于发展期;从土地利用空间格局变化来看,优势度指数逐渐增大,而多样性指数和均匀度指数逐渐减小,土地利用/覆盖的破碎程度呈现加强的趋势.

A Study of Dynamic Change of Land Use in Neijiang City

Land use and land cover change is one of the core subjects in global change researches.According to the data of investigation for land resources from 1997 to 2005,and with mathematical statistical method,dynamics of land use structure was detected.The results show that the extents of various land use types are large,the area of cultivated land,unutilized land and water area is inclined to decrease and the landscape,forest land,grassland and buildings are increasing.There are notable differences of land use changes among the sub-areas in the region,and the extents of changes of land use in various counties are larger than that of Neijiang City,the downtown area of which is in the process of adjustment,but those in the rest counties are in the process of development.The indexes of dominance are raised,but the indexes of diversity and evenness are declined.The degree of fragmentation is gradually strengthened.