延庆县土地利用景观格局的变化

Land Use and Landscape Pattern Change in Yanqing County,Beijing City

以京津源风沙治理试点延庆县为例,利用1999、2002、2006年3期ETM+数据,分析了该区从1999年到2006年间土地利用及景观格局的变化情况。研究表明:延庆县7a间沙化土地、荒山荒地、灌木林、针叶林、农地都有所减少;阔叶林、城镇用地显著增加,其中阔叶林增加最为明显。研究区斑块形状趋于规则,边缘复杂程度降低,景观的破碎化程度降低,景观异质性减少。引起变化的主要原因为区域经济发展和政策导向等,特别是各种林业工程的实施是景观格局变化的最关键因素。

A study was conducted to discuss the land use and landscape pattern change from 1999 to 2006 in Yanqing County,an experimental unit for combating sandstorm affecting Beijing-Tianjin metropolitan region,by means of ETM＋ data in 1999,2002,and 2006.Result showed that the areas of desertification land,barren hills and wasteland,shrub forest,coniferous forest,agricultural land all reduced,while those of broad-leaved forest and urban land increased significantly,in which broad-leaved forest exhibited the most obvious increase.The landscape pattern could be characterized by more regular patch shape and gradually decreasing complexity of landscape edging,degree of landscape fragmentation and landscape heterogeneity.The main reasons which lead to the change in landscape pattern are economic development,policy guidance,and so on,especially the implementation of forestry project.