关键词: 马边彝族自治县, 土地利用/覆被变化, 生态影响

Abstract:

Based on Landsat5 TM imagines and GIS，the land use/cover change (LUCC) of Mabian Yi autonomous county from 1988 to 2001 were analyzed quantitatively with land use dynamic index (LUDI)，land use dynamic model (〖WTBX〗Ki〖WTBZ〗) and land use transfer matrix (〖WTBX〗Cx×y〖WTBZ〗).Moreover，the ecological impacts of LUCC were analyzed and discussed.The area and percentage of secondary forest increased.Oppositely，the area of coniferous forests decreased.In low hill regions，bush slope land was replaced by agricultural lands.The dynamics of town and inhabitant，secondary forest were more dynamic；the areas transferring into these two types were more than that transferred out from them.The land cover pattern changed clearly.The vegetation composing in middlehigh mountains regions changed and the area of mountain meadow shrank.In low hills and valley regions，land cover pattern of agricultural land and bush land became more fragmental.The results illuminated that the LUCC and the land cover pattern of Mabian have dynamic characters，being transferried actively，with strong spatial and intensive impact of human beings.Moreover，the increase in area of secondary forest and the replacing of bush land by agricultural land should be concerned as signals of ecological degradation.Meanwhile，it is also indicated that the possible impact of climate changes on forest succession should be monitored in future.〖

Key words: Mabian Yi minority autonomous county, land use/cover change, ecological impacts〖