岷江上游干旱河谷景观变化及驱动力分析  

Landscape change and its driving forces of dry valley in upper reaches of Minjiang River

作　　者：杨兆平[1] 常禹[1] 胡远满[1] 刘淼[1] 问青春[1] 张文广[1] 

机构地区：[1]中国科学院沈阳应用生态研究所

出　　处：《生态学杂志》2007年第6期869-874,共6页Chinese Journal of Ecology

基　　金：国家重点基础研究发展规划资助项目(2002CB111506)

摘　　要：基于遥感和地理信息系统,应用景观格局分析软件,研究了岷江上游干旱河谷1974—2000年的景观变化,并对其驱动因子进行了分析。结果表明,岷江上游干旱河谷的面积在不断扩大,灌木林地面积占景观面积的60%以上,为景观基质。在景观类型面积比例的变化中,耕地的变幅最大。干旱河谷的整体形状较简单,1974—1995年破碎化程度和异质性程度持续增加,1995—2000年表现为降低趋势,而斑块内部的连通性先降低后增加,具体表现为斑块密度、多样性指数先增大后减小,蔓延度指数先减小后增大,而边界密度和分维数持续减小。人口增长和国家政策是导致岷江上游干旱河谷景观变化的主要驱动力。The study based on GIS and RS showed that from 1974 to 2000, the area of dry valley in the upper reaches of Minjiang River increased continuously. Shrub land occupied 〉 60% of the total, being the landscape matrix. Among the landscape types, cropland had the greatest change in its proportion. The whole figure of the dry valley was relatively simple, and its fragmentation and heterogeneity increased gradually from 1974 to 1995 but changed in adverse from 1995 to 2000. The connectivity inside the patches increased first and decreased then, being represented in the first increase and subsequent decrease of patch density and diversity, an adverse variation trend of landscape contagion, and the continuous decrease of edge density and fractal dimension. Population increase and government policy were the main driving forces of the dry valley landscape change in the upper reaches of Minjiang River.

关 键 词：岷江上游 干旱河谷 景观变化 驱动力 

分 类 号：Q149[生物学—生态学]