林区风景区天然次生林间伐木控制技术研究

根据区域风景区天然次生林结构特点、生长与演替规律及经营目标，选择林木被确定为间伐木的5个定量指标:林木类别，空间密度指数，林木大小比数，美景度，自由度。应用层次分析法得到5个定量指标的权重。当林区风景区次生林林分蓄积或密度达到间伐要求时，在确定间伐强度后，调查林分每株林木指标值，得到林分中各林木间伐几率，按照间伐几率大小排序来选择与控制间伐木，为林区风景区次生林间伐提供间伐木量化选择技术方法。

Control Technique on Selection Cutting Tree of Natural Secondary Forest in Forest Scenic Area

For the tending thinning of the secondary forests in scenic area,the biological diversity and the beauty values of the forests should be taking into account beside considering the general rules such as forest structure,growth,and forest succession.The index system of intermediate cutting probability (ICP_i) was established on the basis of five indexes,including forest category,spatial density,neighborhood comparison,scenic beauty,and degree of freedom.The weights of the indices were determined by AHP,and ICP_i expression was obtained.The experiment was performed in Quercus acutissima secondary forest in Zengguofan Scenic area.A survey was conducted on the forests to be thinned from two aspects,stand survey and the ICP_i value survey.When the stand density or volume met the thinning requirements,the ICP_i of each tree was calculated.According to the order of the ICP_i,the intermediate cutting tree can be selected by determined thinning intensity.The method would provide a quantitative selection of the trees to be thinned in of the natural secondary forests in scenic area.