黑河干流肃南山地森林生态系统的景观格局变化研究

Changes of Landscape Pattern in Forest Ecosystem in Sunan Mountainous Region at Upper Heihe Stem River

肃南山地生态系统是黑河流域生存和发展的基础。以黑河干流肃南山地森林生态系统为研究对象,应用GIS手段,分析其动态变化与环境效应,认为肃南山地森林景观趋于破碎化、老龄化,森林生态系统退化严重,服务功能降低,逆向演化显著,进程加快。景观的稳定性变差,正由单一、均质和连续的整体逐渐向复杂、异质和不连续的斑块镶嵌体的过程转化。其原因是自然背景下的人类活动干扰所致。

Forest ecosystem is a base for exist and development of Sunan mountainous region of Gansu at the upper Heihe River in arid northwest China. Taking the three districts in this region, Dahe district, Kangle district and Mati district, as study object, and using the GIS method we analyzed the succession and environ- mental effect of their forest ecosystems. The forest landscape in Sunan mountainous region tends toward fragmentation and the aged; the forest ecosystem tends toward serious degradation, reverse performance and serve function reducing; the landscape stability of forest ecosystem is turning to be worse, and to be complex, heterogeneous and un-continuous mosaic from single, homogeneous and continuous. The interference of the human activity under the nature background may have resulted in these changes.