鄂西三峡库区森林植被数量及分布的变化分析

Analyze temporal and spatial changes of forest vegetation in Three Gorges Reservoir area of western Hubei

通过建立森林植被覆盖指数变化模型、林草地的流向分析模型、森林植被重心迁移模型,研究了20世纪最后10年间鄂西三峡库区森林植被在数量和空间上分布变化的特点。研究表明:10年间植被变化主要集中在鄂西三峡库区西北地区,特别是兴山县植被变化较多,而夷陵区东面变化较少。10年来研究区林地净减少1 689 hm2,转化为草地面积574 hm2;草地面积净减少1 024 hm2,转化为耕地面积2 108 hm2。10年间研究区林地重心向西北部迁移了4.6 km,耕地重心向东部方向迁移了5.2 km,草地重心向东部方向迁移了3.2 km。

Through the establishment of forest vegetation cover index model,forest and lawn flow analysis model,forest vegetation center of gravity migration model,the temporal and spatial variation of forest vegetation in quantities,inner structure,types and spatial distribution features of the dynamic changes,were studied in detail over a ten-year period.The conclusions were：no significant changes were observed for the vegetation under inverstigation,changes were mainly concentrated in Northwest,especially in Xingshan county.Less change were observed in the east of Yiling district;the area of forest land decreased by 1 689 hm2,which mainly changed into grassland 574 hm2;the area of grassland was decreased by 1 024 hm2,which transformed into arable land 2 108 hm2;the center of gravity of forest land was migrated to the north-western by 4.6 km,arable land was migrated to the eastern by 5.2 km,grassland was migrated to the east by 3.2 km.