义乌城市生态系统景观结构演变

利用1996、19992、0022、005年的义乌市遥感资料,对城市环线内的城市生态系统景观进行分类,用景观指数和转移矩阵分析法,在更宏观层次上分析了人类活动对城市生态系统景观格局的影响。结果表明,1996—2005年研究区自然景观减少了145.58hm2,年变化率2.05%,占研究区的百分比从8.95%下降到7.30%;半自然半人工景观减少了3 545.32hm2,变化量超过了1996年一半,年变化率6.17%,占研究区的百分比从72.33%下降到32.17%;人工景观增加了3 690.89hm2,年变化率24.82%,占研究区的百分比从18.72%上升到60.53%。研究区的城市生态系统景观演化就是自然景观和半自然半人工景观的“城市化”。

THE RESEARCH ON EVOLUTION OF LANDSCAPE STRUCTURE IN URBAN ECOSYSTEM OF YIWU CITY

Landscape pattern of Yiwu urban areas within the city ringed road was classified based on the remote sensing data of the year of 1996,1999,2002 and 2005.The paper researched the effects of human activities on landscape pattern of urban ecological system of Yiwu city by analytical methods of landscape index and transfer matrix.The results showed that during the year of 1996 to 2005,the area of natural landscape has lost 145.58 hm~2 and which rate of decrease descends from 8.95% to 7.30% and whose annual gradient is 2.05%,the area of half-natural half-artificial landscape has lost 3 545.32 hm~2 and which area of decrease is more than half in 1996 and whose annual gradient is 6.17%,the area rate of half-natural half-artificial landscape has dropped from 72.33% to 32.17%,the area of artificial landscape has been increased by 3 690.89 hm~2 and the area rate of which is increased from 18.72% to 60.53% and whose annual gradient was 24.82%.It shows that the urban ecosystem landscape evolution is indeed "the urbanization" of natural landscape and half-natural half-artificial landscape.