内蒙古沙地白扦林的植物组成和生态环境调查

沙地白扦林是一种非常罕见的森林生态系统类型,它分布在内蒙小腾格里沙漠东部的固定沙丘上,是内蒙古植物区系的重要标志林。森林的种类组成比较简单,以草原值物种类为主。白扦林可划分为两个类型,沙地藓类苔草白扦林和沙地禾草杂类草白扦林。白扦林在蔽荫条件下更新良好,最后可能发展成一个相对稳定的森林顶极类型。本文根据沙地白扦林的立地条件、气候条件、森林更新特点和生长状况,提出了沙地白扦林扩大营造范围。

An Investigation on Plant Composition and Ecological Environment in Spruce(Picea meyeri)Forest on Sandy Land in Inner Mongolia

The spruce (Picea meyeri) forest growing on sandy soid in the eastern part of lesser Tengger Desert is a very rare type of forest ecosystem. It is an important forest characterized by Mongolian flora. The species compo- sition of the forest is quite simple, with steppe plants dominating the scene. The spruce forest can be divided into two types: (1) moss-sedge-meyer spruce; (2) grass-herb-meyer spruce. The regeneration under canopy is exxellent. The spruce seedlings may eventually become a relatively stable climax forest community on sand. The present paper defines the sites for expansion of spruce forest on sand, based on site conditions, climatic conditions, regeneration character- istics and growth conditions of spruce.