生态环境学报Issue(5)：729-738,10.
季风常绿阔叶林演替系列菌根资源及其与群落多样性的关系
Mycorrhizae respond to plant diversity in monsoon evergreen broadleaved forest succession choronsequence
摘要
Abstract
Plant species diversity, community structure, productivity and edaphic factors varied significantly with forest succession, these variations may influence the diversity of mycorrhizae. To understand how forest structure and function impact on mycorrhizae at ecosystem level, three subtropical forests were chosen along a forest succession series in South China to investigate mycorrhizae, ectomycorrhizae ( ECM ), arbuscular mycorrhizae ( AM ), and mycorrhizal fungal spores in the top soil ( 0-20 cm depth ). Potential influences of forest structure on mycorrhizae were analyzed based on field census together with plant diversity and soil nutrients. The results showed that nearly 70% of fine roots less than 2 mm diameter in the top soil of each forest were colonized by mycorrhizal fungi, but dominate mycorrhizae types varied significantly in the three successional forests. AM accounted for 78% of total mycor-rhizae in the pine forest at early successional stage, ECM contributed to 75% of mycorrhizae in the mixed forest at middle succes-sional stage, and AM and ECM contributed equivalently to total mycorrhizae in the monsoon evergreen broadleaved forest at late succession stage. Mycorrhizal fungal spore density was highest in the pine forest (2 925 spores per 20 g dry soil), which was 2.5 and 2 times of those in the mixed forest and monsoon evergreen broadleaved forest, respectively. We found that the difference of mycor-rhizae composition was associated with plant diversity, community structure and soil nutrient condition in successional forests. Spe-cies-rich and individual high density of grass plants and poor soil nutrient level in the pine forest may result in relatively high propor-tion of AM in the pine forest. Mycorrhizae were dominated by ECM resulting from the dominance of ECM plant in the mixed forest. Abundant plant species and complex community structure in the monsoon evergreen broadleaved forest contributed AM and ECM to equal distribution in the forest. These results suggest that mycorrhizae diversity changed with forest succession as a result of changes in plant diversity, community structure as well as soil nutrient condition, and the reasons varied at different successional stages.关键词
菌根类型/演替/多样性/森林/季风常绿阔叶林Key words
mycorrhizae/succession/diversity/forest/monsoon broadleaved forest分类
农业科技引用本文复制引用
郑克举,唐旭利,张静,韩天丰..季风常绿阔叶林演替系列菌根资源及其与群落多样性的关系[J].生态环境学报,2013,(5):729-738,10.基金项目
国家自然科学基金项目 （）
