中文摘要：

为探讨博斯腾湖流域景观格局动态变化,对流域1990、2000、2005和2010年8月份4期TM影像应用监督分类解译进行土地利用分类和SWAT流域划分,结合对应去趋势分析（DCA排序）,在FRASTATS软件的支持下,利用景观格局指标分别从类型水平上和景观水平上分析了博斯腾湖流域各个子流域的景观格局现状和动态变化。结果表明：1）博斯腾湖流域土地利用类型以草地和未利用地为主,近20年耕地面积和城乡建设用地面积在不断的增加,增长接近一倍;水域面积不断减少,减少面积高达1001.57 km2。2）近20年博斯腾湖流域斑块数量减少,减少幅度在50%以上,斑块形状整体趋于简单,景观的异质性程度降低;景观破碎化程度减低;景观中的草地和水域两种景观类型具有较高的团聚程度和延展趋势,形成了良好的连接性;景观类型优势度升高;景观邻接度升高。3）博斯腾湖流域各子流域景观格局差异明显,其中后博斯腾湖区、清水河区、开都河下游区和环博斯腾湖区景观破碎,斑块形状相对复杂、景观呈聚集分布的特点,且景观多样性较高;开都河中下游区、开都河上游区、黄水沟河区及开都河中游区,景观相对完整,斑块形状简单,聚集度相对大,景观多样性较高。

英文摘要：

In the study area of Boston Lake basin, by interpreting four remote sensing images of 1990, 2000, 2005, and 2010 as information source, this paper carried out the classification of land use as well as the division of SWAT watershed. Subsequently,the indices of landscape pattern were applied to acquire both the landscape pattern and the dynamic changes of each sub- watershed with the support of DCA method as well as the software FRASTATS. The primary conclusions were as follows：（1）Grassland and unused land were the dominant land use types in Boston Lake basin; the area of cultivated land and urban construction land continued to increase in recent 20 years, which was nearly double of the previous area; however, water area kept decreasing with the reducing area up to 1001.57 km2.（2） The patch number declined in recent 20 years in Boston Lake basin, and the descending rate is more than 50%; the patch shapes were inclined to be more simple on the whole; both the landscape heterogeneity and the fragmentation degree showed a decreasing trend while landscape patterns of grassland and water land demonstrated a higher agglomeration level and an extending trend, forming a good connectivity, an increasing dominance and adjacency degree of landscape types.（3） Differences of each sub- watershed landscape pattern are significant in Boston Lake basin. The patch shapes were relatively complex and the landscapes were densely distributed in the back Boston Lake district,Qingshui River district, Kaidu River district and Ring Boston Lake district. Furthermore, these regions had higher landscape diversity. The landscapes were relatively complete with simple shapes while the landscape aggregation degree and the landscape diversity were high in the downstream and upstream of Kaidu river district, Huang ditch River district and Kaidu midstream district.