快速城市化过程中杭州市土地利用景观格局动态

基于1996、2000、2003和2006年杭州市SPOT高分辨率影像，运用多时相直接主成分分析（PCA）与合成分类器相结合的方法准确获取了研究区土地利用变化信息，并利用景观格局指数分析了研究期间杭州市土地利用景观格局的演化过程及特征.结果表明：1996—2006年间，快速城市化过程引发了研究区巨大的景观转化，在人为活动的强烈干扰下，景观格局已由1996年的以农业景观为主逐步变成2006年的以人工景观为主，且景观格局动态呈现多样性和复杂性；期间，耕地景观受城市化的影响最为严重，已经大规模、连片消失；园地景观本身规模很小，人为干预对其斑块结构的影响不是非常明显；林地景观主要呈大面积斑块聚集分布，景观格局对人为干扰的响应不是很敏感；水体景观受人为活动的影响很大，但由于是成片的消失，水体景观的破碎程度变化不明显；该区城市用地是变化规模最大、变化速度最快的景观类型，城市化过程对其结构产生了显著影响.

Dynamics of land use landscape pattern in Hangzhou City during its rapid urbanization

Based on the multi temporal SPOT images of Hangzhou City in 1996, 2000, 2003, and 2006, a method combining Principal Component Analysis (PCA) and hybrid classifier was adopted to accurately extract the land use change information. Meantime, the dynamics and characteristics of landscape pattern change were analyzed by using landscape indexes. The results showed that from 1996 to 2006, the rapid urbanization in Hangzhou induced a tremendous conversion of landscape pattern. Owing to the anthropogenic disturbance, the agricultural landscape was gradually replaced by man made landscape, and the dynamics of the landscape pattern in Hangzhou exhibited complexity and diversity. Cropland landscape was impacted most seriously, being encroached at large scale; orchard landscape suffered from slight impact due to its small occupation in the landscape; forest landscape was insensitive to the impact due to its aggregated distribution; while water landscape was impacted greatly but exhibited slight fragmentation. Urban land landscape was the one undergone the biggest and quickest change.