中文摘要：

使用GIS（地理信息系统,Geographic Information System）的缓冲区法、空间叠置分析法以及景观格局分析法,分析不同等级的行政中心驻地对土地利用景观格局的影响。研究结果表明：（1）耕地是丰县的景观基质,聚落（城乡建设用地）景观是丰县主要的景观类型。与行政中心的距离越近,人为景观的面积比重就越高,大于各景观类型的现状比重,表现出较强烈的空间吸引特性;相反,自然景观所占比重远远低于现状比重,反映出较明显的空间排斥效应。（2）与镇政府的距离变大,土地利用景观的破碎程度、聚集程度、斑块形状的规则程度均先减弱后增强;与县政府驻地的距离变大,景观的破碎程度呈现＂减弱-增强-稳定＂模式,景观形状的复杂程度变大,聚集程度先减弱后稳定,景观的多样性与异质性受两等级行政中心驻地距离的影响程度均较小。（3）镇级、县级行政中心分别在1 500m、3 000m范围内对土地利用景观格局的影响程度大。

英文摘要：

Taking the landscape pattern in Fengxian County of Jiangsu Province as the research subject,we applied buffer analysis and spatial overlay to investigate how the location of administrative center influences the landscape pattern with the support of ArcGIS 9.3software and Fragstat 3.We selected seven landscape indices that can reflect landscape fragmentation,the regularity of landscape patch,the degree of aggregation and the diversity heterogeneity of the landscape.The results show that：a）Cultivated land is the dominant land use type of the landscape and settlement landscape is one of the most important landscape patterns in Fengxian County.The degree of aggregation of cultivated lands and garden plots is higher than forest lands and the other agricultural lands.Natural reserved areas are minimally fragmented and suffered a mild influence from human activities.However,the degree of fragmentation is the highest for the other agricultural lands.The distance to the administrative center is near,the anthropogenic landscapes occupy a big proportion in the landscape area of the buffer zone,that is to say there is a characteristic of spatial attraction.However,the proportion of natural landscapes is lower,which is much smaller than the present proportion.In other words,there exists the effect of spatial repulsion.b）The distance to the town government expands,the degree of fragmentation,aggregation and the regularity of landscape patch tend to be strengthened in the first phase and then weakened.And the impact on landscape diversity and landscape heterogeneity can be so small if the distance to the town government is longer than 1 000 meters.With increasing distance to the county government,the degree of fragmentation presents a＂weakened-enhanced-stable＂pattern.The degree of the complexity of the landscape shape increases gradually and accumulation degree decreases and then stable.Just like the changes in the landscape diversity and landscape heterogeneity which are affected by the distance to the town governmen