森林演替过程中根系分布的动态变化

综述了演替过程中植被根系的分布与动态变化的研究进展,阐述了未来森林演替过程根系研究的重点和技术路线.根系作为生态系统中一个重要组成部分,在植被演替过程中占有重要地位,演替早期的树种的根系分布深度和根系总长度都要比后期树种的高,这种分布特征使林木得以吸收深层的水分和养分,并为演替后期的植被生长创造了良好的生长环境.由不同种群的根系分布范围可以描述该种群可以利用的资源范围以及它在演替过程中的作用和地位.森林根系分布受自身条件(如植被组成、林龄、所处演替阶段)和生态因子(如大气、气候带、土壤条件等)的影响.未来应加强森林根系动态研究的标准方法研究;森林根系分布和分层结构的动态与功能研究;全球变化对根系生态效应研究;根系生态系统的生物多样研究;根系演替速度研究等.

The Dynamics of Forest Root and its Distribution during Succession

The studies on the distribution and dynamics of forest root were reviewed in this article. As substantial components in the ecosystem, roots play an important role in succession process, the depth of root distributed and root length of trees are more in early succession than in late succession. This characteristic of roots makes them absorb nutrients and water in deeper soil layer and then creates a good habitat for escatophyte. The root distribution of forest is affected by both the intrinsic factors (such as components, age of stand, succession stage) and ecological factors such as soil conditions, atmosphere such as doubled CO2 and climate zone. The research emphasis and technique way for studying root dynamics in forest succession process were put forward. These areas should be strengthened, such as studying on standard method of root research, relationship between layer structure of root distribution and function, the effect of global change on root, the diversity of root ecosystem and their relationships, and rapidity of root succession.