太白红杉林径级和龄级结构的研究

Size-class and Age-class Structures of Larix chinensis Forests

在秦岭太白山 ,选取太白红杉 3个林型组中的 8种林型 ,设置 2 0个样地 ,用样方分析法进行调查 ,共做样方180个 ,主要分析了太白红杉 8种林型的径级和龄级结构及其密度变化规律等 ,根据它们的径级和龄级结构表现特征 ,划分为 3种类型 ,结果表明用径级和龄级对太白红杉林进行客观描述存在着一致性 ,太白红杉年龄均值浮动区间的大小 ,说明太白红杉林种群在发育上存在着时间差异 ,还对造成太白红杉 8种林型的这一径级和年龄结构的形成原因进行了探索 ,提出了相应的保护策略 .

In Qinling Taibai Mountain,8 Larix chinensis forest-types were selected from 3 Larix chinensis forest-type groups and 20 stands were set up.180 plots in Larix chinensis population were investigated with the sampling method.The 8 Larix chinensis forest-types's structures of size-class and age-class and density changing were principally analyzed.Based on the appearance feature of size-class and age-class structures,the natural forests were classified into 3 types.The results showed that there was consistency in using size-class or age-class to objectively describe Larix chinensis forests and the fluctuating range of the average-age of Larix chinensis forests indicated that there were growth time differences among different Larix chinensis forest-types.In this study,the forming reasons of the size-class and age-class structure were probed,and some corresponding protecting strategies were proppsed.