杉木生长过程特征和生长期划分

本文用典型分析方法研究了浙江湖州不同立地条件下杉木胸径、树高和材积的生长过程特征。在目前的栽植密度范围内,立地条件愈好,该边缘产区的杉木生长冲劲愈大,各生长指标的连年生长量高峰出现愈早,持续时间相应愈长,具有典型的“冲劲大,后劲小”的特点。而立地较差的林分,连年生长量高峰不明显,其平均生长量基本处于低水平的缓慢增长状态。用有序样本聚类法进行了杉木胸径、树高和材积的生长阶段划分。结果表明该3个生长指标均可分为4个生长阶段,即幼树阶段、速生阶段、干材阶段和滞长阶段。

The Characteristics of Growing Processes of Chinese Fir and Division of its Growth Stages

By canonical analysis, the growing-processes of diamater, height and stock of Chinese fir in Huzhou, Zhejiang, were studied at different sites. Within the present density scale, the better the site conditions were, the faster the tree grew in the early stage in this region, the earlier the peaks of annual increment of the parameters appeared, and the longer the duration of the peaks was. The characteristics could be summarized as follows: more increment in the early stage and less increment in the late one. At a worse site, the peaks of annual increment were indistinct and average incrememt increased slowly. Using cluster method for ordered sample, the growing-processes of the diameter, height and stock were divided into sapling, fast-growing stage, woody stage and slow-growing stage.