ABSTRACT

Data were available from two measurements of each stand of a set of stands in native regrowth and plantation forests of Eucalyptus pilularis (blackbutt) in subtropical New South Wales and Queensland. Measurements were made after competition-induced mortality had started in each stand. Most of the regrowth forest had been thinned some time before the measurements. Based on the Reineke model that relates stand stocking density to quadratic mean diameter, a maximum density line was determined for each stand based on methods developed by Vanclay and Sands. It was found that the intercept of the maximum density line increased both with increasing stand site productive capacity and in the thinned regrowth stands. The latter finding does not seem to have been reported for forests before; it is hypothesised to be a result of the delayed redevelopment of inter-tree competitive processes following the major reduction in stand density resulting from thinning. Both effects will have consequences for the structure of density management diagrams commonly used to assist in forest management practice.

摘要

数据可从毛桉原生再生林和人工林中一组林分的每个林分的两次测量中获得(blackbutt) 在亚热带新南威尔士州和昆士兰州。测量是在每个站的竞争引起的死亡率开始后进行的。在测量前一段时间，大部分再生林已经变薄。基于将林分放养密度与二次平均直径联系起来的 Reineke 模型，根据 Vanclay 和 Sands 开发的方法确定了每个林分的最大密度线。发现最大密度线的截距随着林地生产能力的增加和变薄的再生林地的增加而增加。后一种发现似乎以前没有关于森林的报道；据推测，这是由于疏伐导致林分密度大幅降低后，树木间竞争过程的重新开发延迟所致。