京郊北藏乡防护林景观生态评价

根据防护林学和景观生态学的原理 ,将野外调查与地理信息系统RegionManagerV4 .0和遥感等技术相结合 ,从林带和林网两个尺度对北京市大兴县北藏乡防护林体系的布局和结构的合理性 ,进行分析和评价 .作者认为 :该乡主林带防护能力不足 ,副林带过宽 ;组成林带的物种类型单一 ;整个景观结构与布局不够合理 .经过分析论证 ,对该区防护林的经营管理方向提出了建议 :应适当增加主林带的宽度 ,减少副林带的宽度 ,重视混交林的营造 ,中间乔木树种两侧辅以灌木的乔灌混交形式较适合 ,林带透光疏透度应保持在 0 .3～ 0 .4 ,闭合林网数应达到 1 3个 km2 .

Evaluation of landscape ecology of shelterbelt system of Beizang Town, Daxing County, Beijing

On the basis of priniples of protection forestry and landscape ecology, and by using field investigation, GIS and RS, this paper analyzes and evaluates the structure and pattern of shelterbelt system of Beizang Town,Daxing County,Beijing. Results demonstrate that the protection capability of main shelterbelt is weak, and the assistant shelterbelt is too wide. The whole landscape arrangement is not reasonable. In view of these problems, the suggestions about the management are put forward as follows:the main belts should increase in width while the assistant belts should decrease in width, and more mixed species should be planted; the pattern that arbores are in the middle of belts and shrubs are in the sides of belts should be used;the porosity should be 0 3～0 4; and the number of closed network should be 13 per km 2.