基于RS与GIS的闽江流域土地利用景观格局变化分析

以闽江流域为研究区域,Landsat TM遥感图像为主要信息源,遥感软件Erdas作为空间信息处理工具,采用斑块平均面积、平均形状指数、分维数、破碎度、香农多样性指数、均匀度指数和优势度指数等指标,对闽江流域1986-2003年土地利用景观格局变化进行了分析.结果表明:闽江流域整体景观斑块数目增加了111块,平均斑块面积减小0.7 km2,平均形状指数和分维数降低,破碎程度增加.人类活动对景观的有利与不利干扰的相互作用和影响使景观各要素发生了较复杂的结构变化和相互转化.从多样性指数来看,景观整体香农多样性指数由1.32降低到1.05,均匀度指数由0.89降低到0.72,表明优势组分林地对景观的控制作用不断增强,景观稳定性和异质性降低.

Analysis on pattern change of land use landscape in Minjiang watershed based on RS and GIS

In the support of remote sensing and geographic information system technology, with the help of RS tool of Erdas based on the information from Landsat TM image,some indices were put forward to analyze the pattern change of land use landscape in Minjiang watershed from 1986 to 2003.These indices included mean matrix area,mean contour index,fractal dimension,fragmentation,Shannon-weiner diversity index,Shannon-weiner evenness index,dominance index.The results showed: the number of integral landscape patch increased 111 pieces,mean matrix area decreased 0.7 km2,mean contour index and fractal dimension decreased,fragmentation increased.The landscape elements had a complex structural change and translation each other due to man′s advantaged and disadvantaged disturbance to landscape.The decrease from 1.32 to 1.05 of Shannon′s diversity index and decrease from 0.89 to 0.72 of evenness index indicated that the control of woodland was increasingly increased,the stability and heterogeneity of landscape decreased.