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该文在野外调查工作和对“八五”二类调查资料统计分析的基础上,通过对京北山区(包括密云、怀柔、延庆、昌平四县)水源保护林现状的总体分析和对密云县北庄乡的典型分析,指出林种比例不当及树种资源单一是该区水源保护林发展中存在的比较突出的问题.该文从多林种、多树种配置,造林树种选择和林分结构的优化与调整方面提出现有林的发展策略,并提供了现有林的经营类型和对应各种立地类型的造林树种.
Based on the field investigation and the statistical analysis of the data of the second five surveys in the “Eighth Five-Year Plan”, this paper analyzes the current situation of water source protection forests in mountainous areas of northern Beijing (including Miyun, Huairou, Yanqing and Changping) The typical analysis of townships indicates that the improper proportion of forest species and the single species resources are the prominent problems in the development of water source protection forests in this area.The paper studies the characteristics of multi-species, multi-species allocation, tree species selection and stand structure optimization In terms of adjustment, we proposed the development strategy of the existing forest and provided the management types of the existing forests and the afforestation species corresponding to the various site types.