论文部分内容阅读
提出“间伐指数”这一新概念来量化林木在抚育间伐中被确定为间伐木的概率,突破了传统方法中对间伐木确定笼统定性的局限。选取林木的自由度、混交度、大小比数、健康指数、空间密度指数和目的树种特性指数等6个指标,结合对象林分的经营类型,并运用层次分析法给各指标赋权重,可得出该林分林木间伐指数的计算模型。以湖南省沅江市龙虎山林场青椆混交林的一个试验样地为案例,采用“间伐指数”来确定间伐木,得到了较为理想的抚育间伐方案。
The new concept of “thinning index” was proposed to quantify the probability that trees were identified as thinning during tending and thinning, which broke through the limitations of the general qualitative identification of thinned wood in traditional methods. The six indexes of degree of freedom, mixed degree, size ratio, health index, spatial density index and target species index of forest were selected, combined with the management types of the forest stands and weighted by AHP The calculation model of the thinning index of forest stands. A case study of mixed forest of Longhu Mountain Forest Farm in Yuanjiang City, Hunan Province was taken as a case study. The “thinning index” was used to determine the thinning wood and the ideal tending thinning scheme was obtained.