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Interactions between elevated CO2 levels and floating aquatic plants on the alteration of bacterial function in carbon assimilation and decomposition in eutrophic waters

文献类型： 外文期刊

作者： Shi, Man 1 ; Li, Jiangye 1 ; Zhou, Qi 2 ; Wang, Guibin 2 ; Zhang, Weiguo 1 ; Zhang, Zhenhua 1 ; Gao, Yan 1 ; Yan, Shaohua 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, 50 Zhongling St, Nanjing 210014, Peoples R China

2.Nanjing Forestry Univ, Coll Forestry, Nanjing 210037, Peoples R China

3.Minist Agr & Rural Affairs, Key Lab Agr Environm Lower Yangtze River Plain, Nanjing 210014, Jiangsu, Peoples R China

关键词： CO2 elevation; Floating aquatic plant; Bacterial community composition and function; Carbon cycle; Eutrophication

期刊名称：WATER RESEARCH （ 影响因子：11.236； 五年影响因子：11.547 ）

ISSN： 0043-1354

年卷期： 2020 年 171 卷

页码：

收录情况： SCI

摘要： Elevated atmospheric CO2 concentration (eCO(2)) may have different effects on the bacterial community with regard to C assimilation and decomposition in eutrophic waters compared to that in fresh waters with intermediate levels of nutrients and oceans. Aquatic plant growth under eCO2 could further modify microbial activities associated with the C cycle in eutrophic waters. Therefore, there is an urgent need to further study how eCO2 and its interactions with the growth of aquatic plants affect the composition and function of the bacterial community involved in mediating the C cycle in eutrophic waters. Accordingly, we designed a microcosm experiment to investigate the effects of ambient and high CO2 concentrations on bacterial community composition and function in eutrophic waters with and without the growth of Eichhornia crassipes (Mart.) Solms. The results from 16S rRNA gene sequencing, function prediction, and q-PCR showed that eCO(2) significantly increased the abundance of bacterial and functional genes involved in CO2 assimilation (photosynthetic bacteria; cbbL IA & IC, cbbL ID, cbbM, pufM) and C decomposition (Acidimicrobiia, Thermoleophilia, Gaiellales; ChiA), illustrating the functional enrichment with photo-autotrophy, hydrocarbon degradation, cellulolysis, and aromatic hydrocarbon degradation. However, eCO(2) decreased the abundance of some chemoautotrophic bacteria, including nitrifying bacteria (Nitrospirae, Nitrosomonadaceae). In contrast, the cultivation of E. crassipes decreased the abundance of photosynthetic bacteria but increased the abundance of bacteria involved in complex C decomposition associated with root exudates and degradation, e.g. Fibrobacteres, Sphingobacteriales, Sphingomonadales, and Rhizobiales. eCO(2) and growth of E. crassipes had opposite effects on algal density in eutrophic waters, creating interactive effects that further decreased the diversity of the bacterial community and abundance of some CO2-assimilating bacteria with nitrifying characteristics (Nitrosomonadaceae) and some C-degrading bacteria (Fibrobacteres) with denitrifying properties (Flavobacteriaceae, Sphingomonadaceae, and Gemmobacter). Therefore, the interactions between aquatic plants and the bacterial community in eutrophic waters under eCO(2) would be beneficial to the environment and help alleviate the greenhouse effect. (C) 2019 Elsevier Ltd. All rights reserved.

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