岷山火溪河非保护区域景观格局及影响分析

Landscape pattern and influence analysis in the non-protected area of the Huoxi River watershed,Min Mountains

以平武县植被图和野外调查资料为数据源,GIS技术为研究手段,在景观结构分析软件Fragstats支持下,利用相关景观指数对火溪河流域非保护区域景观格局进行了研究.结果表明:林地分布最广,是研究区的景观基质.冷杉林、草地分布海拔高,受干扰程度最小,聚集程度高,连接度高,破碎化程度低.耕地、聚居地受干扰频繁,聚集程度低,连通性差,破碎化程度最高.研究区景观格局呈现出平均斑块面积减小,景观类型趋于分散,优势景观类型消失,连接度降低,景观异质性、多样性、均匀度升高的特征.以大规模森林采伐为主的人类干扰是景观格局改变的主要原因.

Supported by the GIS and Fragstats software, the vegetation map derived from vegetation map of Pingwu County and our field survey data were used to calculate landscape pattern indices and characterize the landscape patterns of non-protected area of the Huoxi River watershed, in Pingwu County, Sichuan Province. The results show that forest lands are the landscape matrix, covering 84.08% of the whole area. The fir forests and meadows, with higher contagion and connection, less disturbance and lower fragmentation, are located in high-altitude areas. Farmlands and habitation areas often suffer intensive human disturbance with lower contagion, connectivity and integrity. The landscape patterns of the working area is characterized by decrease of mean patch area, disappearance of dominant landscape types, decline of connection, and increase of heterogeneity, diversity and evenness of landscape. The intensive timbering of human being might be the main cause resulting in the changes of landscape patterns.