永定河流域森林质量评价与分析

Evaluation of Forest Resources Quality in Yongding River Basin

森林质量评价能很好反映区域森林生长发育状况及其存在问题,可为其质量提升和科学利用与经营提供依据及参考。运用层次分析法、综合指数法,选取森林结构、林地生产力、森林健康作为约束层,乔木林面积、龄组结构、平均胸径等9个指标作为指标层,对永定河流域森林资源质量进行评价。结果为:对照华北地区,永定河流域森林资源质量评价指数为0.8426,评价等级为好,整体质量良好,能够为流域提供较稳定的生态功能,森林抚育基础良好,森林质量提升仍有较大潜力;单位面积蓄积、有林地比例、森林火灾3个指标表现较差,也是今后林地质量提升的主要方向;林地生产力和森林结构是流域森林资源质量的主要影响因子。

The quality evaluation of forest resources can well explain the forest growth and development in the region.Using analytic hierarchy process and comprehensive index method,forest structure,forest productivity and forest health are selected as the constraint layer,and 9 indexes such as arbor forest area,age group structure and average DBH are selected as the index layer to evaluate the quality of forest resources in Yongding river basin.The results showed that compared with North China,the evaluation index of forest resources quality in Yongding river basin was 0.8426 and the evaluation grade was good;forest productivity and forest structure are the main factors affecting the quality of forest resources in the watershed.Referring to the situation of forest resources in North China,the three indicators of unit area accumulation,proportion of forest land and forest fire are weak.The quality of forest resources in Yongding river basin is generally good,which can provide a more stable ecological function for the basin,has a good foundation for forest tending,and still has great potential for improvement in the quality of forest resources.