甘肃省洮河林区云、冷杉林分结构实例

本文通过对三块0.25公顷标准地的林分调查,反映洮河林区云杉纯林、冷杉纯林及云、冷杉混交林三种不同林分的结构实例,说明本区云、冷杉林属于复层异龄林,一般具有两层和两个世代。株数与径级的分布,是倒J 型递减曲线,但出现不典型的偏左高峰。还分析了其他一些林分结构特点,对于正确认识现实林分,制定科学经营措施,有重要参考价值。

The Examples of picea and Abies Forest Structure in Taohe County,Gansu Province

Based on the investigations of the three pieces of sample land (0.25 ha each),the examples of three different kinds of forest structure have been given:pure picea and Abies forests and picea and Abies mixed forest.The picea and Alies forest in this area is classified as a duplicate layer one at pifferent age.As a rule,the forest has two layers or two generations.The distruction of plant numbers according to its diameter class can be showned as a upside-down-J-shaped curve wish its peak on the left side. The characteristics in structure of other kinds of forests have also been an alyged.So the paper has some value of reference for the correct understanding of forest reality and for taking scientific steps of forest managelment.