鄱阳湖入湖河口沉积物真菌群落结构

本次研究基于高通量测序技术分析了鄱阳湖入湖河口14处沉积物的真菌群落结构特征.测序得到的314条真菌OTU分属于9个门,25个纲,49个目,62个科,62个属和117个种.在OTU分类水平上,鄱阳湖主要支流入湖河口中除饶河、赣江南支和修水具有相近的真菌群落结构外,其它河口之间群落结构差异较大;真菌群落丰度、多样性与沉积物p H、有机碳、有机氮和C/N等环境因子没有显著相关性.在门分类水平上,丰度(序列数比例)最高的是子囊菌门(Ascomycota,49.4%),其次为壶菌门(Chytridiomycota,20.4%)和担子菌门(Basidiomycota,17.8%).与其它河口相比,赣江河口沉积物的水生环境真菌Chytridiomycota丰度显著较高,抚河河口沉积物的陆生环境真菌Basidiomycota丰度显著较高.有机碳是影响鄱阳湖入湖河口沉积物真菌群落门分类组成的主要环境因子,与Basidiomycota相对丰度正相关,与Chytridiomycota负相关,与Ascomycota相关性较弱.

Fungal community in the estuarine sediment of Poyang Lake

In this study, high throughput sequencing was introduced to study the fungal community structure in 14 estuarine sediments of Poyang Lake. A total of 314 fungal OTUs were observed from sequencing, which were classified into 9 phyla, 25 classes, 49 orders, 62 families, 62 genera and 117 species. On the OTU level, similar fungal community structure was found among estuarine sediments of the Rao River, the southern branch of the Gan River and the Xiu River, while large differences existed between other estuarine sediments. The fungal richness and diversity were not significantly correlated with environmental factors, such as pH, organic carbon, organic nitrogen and C/N in estuarine sediments. On the phylum level, Ascomycota had the largest abundance of sequences (49.4%), followed by Chytridiomycota (20.4%) and Basidiomycota (17.8%). Compared with the fungal community structure in other estuarine sediments, the estuarine sediment in Gan River had significant higher abundance of Chytridiomycota, which originated from the aquatic environment; and the estuarine sediment in Fu River had significant higher abundance of Basidiomycota, which originated from the terrestrial environment. The organic carbon was the dominant environmental factor explaining the phylum community structure in the estuarine sediment of Poyang Lake, which was positively correlated with the relative abundance of Basidiomycota, negatively correlated with that of Chytridiomycota, and weakly correlated with that of Ascomycota.