杭州市区土地利用景观格局演变及驱动力分析

Analysis on Land Use Landscape Pattern Changes and Driving Force in Hangzhou City

基于遥感影像应用景观生态学及相关定量分析方法,剖析了杭州市区1991—2005年来的快速城市化阶段的土地利用景观格局演变特征,并引入典范对应分析(canonical correspondence analysis,CCA)方法进行驱动力机制分析。研究表明:①杭州市近15年来土地利用景观结构发生了较大的变化,主要表现为农业景观与水体景观大量减少,并成为建设景观增加的主要来源,其中农业景观占建设景观来源的43.85%;②景观水平格局特征表现为斑块总数的增加、景观多样性的上升、景观破碎化程度呈现上升趋势、斑块优势在下降,说明大斑块对整个景观的控制作用随土地利用变化呈减弱趋势;③CCA排序结果清晰展现了杭州市8个区的景观格局指数与驱动因子的相互关系及空间特征。

Based on the interpretation of TM images,the theory of landscape-ecology and the method of quantitative analysis,the characteristics and changes of landscape pattern in Hangzhou city during the past 15 years（1991—2005） were analyzed and meanwhile the driving force of landscape changes were discussed based on canonical correspondence analysis（CCA） method.The results showed：（1） The land-use landscape pattern changed greatly,mainly the area of farming landscape and water landscape declined significantly,but the area of building landscape increased,which of 43.85%came from farming landscape;（2） Number of patches（NP） and Shannon＇s diversity index（SHDI） and fragmentation （FN,） increased,however,the dominance（D） decreased.These results showed that landscape pattern would became smaller and smaller;（3） CCA method clearly demonstrated the correlations and spatial feature between landscape pattern indices and driving forces at eight districts in Hangzhou city.