植物病原菌在森林动态中的作用

摘要/Abstract

摘要： 植物病原菌作为森林生态系统的重要组成成分及调控因子之一,在森林动态中扮演着重要的角色。植物病原菌通过侵染过程导致寄主植物的幼苗及成熟个体死亡、成熟个体的种子量降低或不实,或造成植物个体或群落中不同物种不同程度的病害,影响它们之间的营养竞争,从而导致群落结构、物种及个体数量的变化。感染散布前、后的种子和土壤种子库中的种子,以及由种子萌发产生的幼苗,它们的存活率降低,进而影响森林中的种子散布、幼苗更新与增补格局。在天然林中,先锋树种比顶极树种对病原菌更敏感,群落演替的早期阶段对病原菌比较敏感。植物病原菌主要通过密度依赖机制造成森林树种不同的死亡格局,从而参与森林的动态过程.

关键词: 扬子鳄, 水环境, 重金属含量, pH

Abstract: As a component and regulator in forest ecosystem, plant pathogens play an important role in forest dynamics. Infection by plant pathogens often results in increased mortality of seedlings and adult plants, and in lower fecundity or sterility, and influences the competition for nutrients, which can induce changes in community structure and number of species and individuals. Plant pathogens can infect the seeds of pre-dispersal and post-dispersal, and those in soil seed banks and seedlings germinated from seed bank, thus decrease their survival rate, contributing to pattern of the seeds dispersal, regeneration and recruitment of the seedlings in forest. In natural forest, pioneer tree species are more susceptible to plant pathogens than climax species. Plant community in early succession stage is susceptible to plant pathogens compared to climax community. Plant pathogens have been found to operate mainly in a host density dependent manner in forest dynamics. So it is important to study the effects of the pathogens in forest dynamics for the purpose of sustainable forest management.

Key words: Chinese alligator, Water environment, Heavy metals content, pH

中图分类号:

S718.5

付先惠, 曹敏, 唐勇. 植物病原菌在森林动态中的作用[J]. 生态学杂志, 2003, (3): 59-64,69.

FU Xianhui, CAO Min, TANG Yong. Effects of plant pathogens on forest dynamics[J]. cje, 2003, (3): 59-64,69.

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