峨眉冷杉林森林类型的研究

峨眉冷杉林分布于东亚两大植物亚区的交壤地带，但植物种类以中国—日本成分为主，组成我国亚热带湿润常绿阔叶林区西部边缘的山地暗针叶林类型。林区气候高湿多雨，相适应的森林类型的特征特性多不同于其以西的高山峡谷区。 文中分析了此类森林的林层结构、径级结构和年龄结构，表明为多世代的异龄性的单层纯林。根据群落外貌划分为三个林型组和六个林型，论及各林型间生产力的差异，并着重于动态观察，认为演替的途径、阶段和速度与林型本身特性有关，与采伐方式也很密切，但相对稳定的林型遭破坏后任其顺行发展，均能恢复为原来的林型。鉴于此类森林成熟过熟林多，病朽严重，而林区气候优越，植被恢复迅速，在确保水源涵养和生态环境的前提下，森林资源合理利用仍属必要，关键在于提高经营水平，应根据各林型特点和演替规律合理采伐，使可更新资源能永续利用。

A Study of the Forest Types of Omei fir (Abies fabri)

Omei fir forest is a main original forest formation in the western mountain of Sichuan Basin. Being affected by the air currents of Pacific monsoon, and by the air temperature decreasing with increasing in altitude, so that the mountainous climate becomes suddenly cool and the precipitation is also abundant. Therefore this fir forest may be considered as a subalpine coniferous formation within the western-most boundry of the humid evergreen broad leaf forest region. The great majority of floristic composition belongs to Sino-Japanese subregion, and the community character differs from other fir forests in eastern part of Xizang plateau.This paper deals with the structure and component of Omei fir forest. Six major forest types of this fir are recognized and the growth analysis is compared between them. The natural processes of stand regeneration and succession vary with forest types at present. The changes in composition in times during succession are largely affected by differences in intensity of felling.In addition, it gives advices to raise the level of forest management, to adopt reasonable felling, to speed up the forest regeneration and other.