Shifts in Microbial Biomass C/N/P Stoichiometry and Bacterial Community Composition in Subtropical Estuarine Tidal Marsh
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Shifts in Microbial Biomass C/N/P Stoichiometry and Bacterial Community Composition in Subtropical Estuarine Tidal Marshes Along a Gradient of Freshwater–Oligohaline Water Minjie Hu,1 Josep Pen˜uelas,2,3 Jordi Sardans,2,3 Xianyu Yang,4 Chuan Tong,5 Shuangquan Zou,6* and Wenzhi Cao1* 1
State Key Laboratory of Marine Environmental Science, College of the Environment and Ecology, Xiamen University, Xiangan South Road, Xiamen 361102, People’s Republic of China; 2CSIC, Global Ecology CREAF-CSIC-UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain; 3CREAF, Cerdanyola del Valle`s, 08193 Barcelona, Catalonia, Spain; 4School of Ecological and Environmental Science, East China Normal University, Shanghai 200241, China; 5Key Laboratory of Humid Sub-tropical Eco-geographical Process of Ministry of Education, Fujian Normal University, Fuzhou 350007, People’s Republic of China; 6College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, People’s Republic of China
ABSTRACT Saltwater intrusion results in increased estuarine salinity, affecting both ecosystem nutrient dynamics and bacterial community composition in estuarine tidal marshes. However, whether soil microbial biomass (SMB) and bacterial community composition have different responses to low levels of salinity increase is largely unknown. We designed an experiment to investigate the stoichiometry of microbial biomass and bacterial community composition in both the rhizospheres
Received 12 March 2019; accepted 18 November 2019 Electronic supplementary material: The online version of this article (https://doi.org/10.1007/s10021-019-00468-5) contains supplementary material, which is available to authorized users. Author’s Contributions MJH, WZC and SQZ conceived the study and provided project support. MJH and XYY performed the research and analyzed the data. MJH wrote the manuscript. JP, JS, and CT contributed to writing, analysis and editing. All authors contributed to the work and gave final approval for publication. *Corresponding author; e-mail: [email protected] and [email protected]
and bulk soils along a low-level salinity gradient across two freshwater and three oligohaline marshes. Soil microbial biomass C (MBC) and microbial biomass nitrogen (MBN) significantly decreased in both rhizospheres and bulk soils as salinity increased, while microbial biomass phosphorus (MBP) increased only in the rhizospheres. Rhizospheric effects increased the concentrations of MBC and MBP but did not significantly affect the concentration of MBN relative to the bulk soils. MBC/ MBN/MBP ratios fluctuated drastically, and no clear trends were observed for both the rhizospheres and bulk soils along the salinity gradient. The composition of the bacterial communities changed greatly with increases in salinity, affected by changes in the proportional frequencies of the bacterial taxa, while bacterial alpha diversity was not significantly affected by salinity. A redundancy analysis found that the overlying water salinity and sulfate and soil total organic carbon had a syne
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