生态学报2018，Vol.38Issue(11)：3825-3837,13.DOI:10.5846/stxb201705220946
鄱阳湖湿地土壤微生物群落结构沿地下水位梯度分异特征
Variation in the distribution of soil microbial community structure along ground water level gradients in the Poyang Lake Wetland
摘要
Abstract
To reveal the response of soil microbial community structure to the changes of ground water level,a 200m × 300m field experimental site was setup in the beach of Baisha Lake,a typical shallow lake of the Poyang Lake Wetlands.This site included 4 ground water levels:GT-A,GT-B,GT-C,GT-D (moving from shore to center).Phospholipid fatty acids (PLFA) analysis was applied to determine the microbial community structure.Results showed when ground water level raised from GT-A to GT-D,soil pH and sand content increased and soil organic carbon (SOC),bulk density,clay and silt particle contents decreased.Compared to GT-A,microbial biomass carbon (MBC),microbial biomass nitrogen (MBN),and their allocation ratio of GT-D were significantly more by 2.82,4.30,5.77 and 7.15 time.The abundances of total PLFAs,bacterial,actinomyces,gram-positive bacteria and gram-negative bacteria increased 106.8％,117.2％,74.9％,107.9％ and 207.2％.The raise in ground water level enhanced the environmental stress on the microbial community,resulting in a decrease in microbial bio-diversity.Soil pH,moisture,sand contents as well as the C ∶N ratio have significant correlations with PLFA signatures.Further,the microbial quotient (MBC/ SOC) is mainly influenced by soil pH and texture.In summary,the results show significant effects of ground water level on both soil microbial biomass and community structure during the dry season.关键词
鄱阳湖/土壤微生物群落结构/地下水位梯度/磷脂脂肪酸Key words
the Poyang Lake/soil microbial community composition/ground water level gradients/Phospholipid fatty acid (PLFA)引用本文复制引用
张广帅,于秀波,张全军,李雅,刘宇,段后浪..鄱阳湖湿地土壤微生物群落结构沿地下水位梯度分异特征[J].生态学报,2018,38(11):3825-3837,13.基金项目
国家自然科学基金项目(41471088) （41471088）
地方合作项目(鄱阳湖水生态综合模型研究及开发) （鄱阳湖水生态综合模型研究及开发）
