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CATENA
Volume 201, 2021, 105212

Deciphering edaphic bacterial community and function potential in a Chinese delta under exogenous nutrient input and salinity stress

Zifang Chia, Shijie Jua, Huai Lib, Jiuling Lic, Haitao Wub, Baixing Yanb

Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, PR China.

Abstract

ellow River Delta, and revealing the potential impact of exogenous nutrient input on structure and function of microbial communities was very important for the health assessment of coastal wetlands. In this study, high-throughput sequencing was used to investigate the community composition, co-occurrence pattern, and functional potential of soil microorganisms under different exogenous nutrient input and salinity stress. Bacterial community structures changed in different stress patterns. The dominant species were HalomonasMarinobacterSalinisphaeraSalinibacterOceanicaulisSalinimicrobiumnorank_f_Halobacteroidaceae unclassified_f_HalomonadaceaeIdiomarinaMethylohalomonasAlcanivoraxNitrococcusNitrosomonas, and Nitrospina. Interestingly, the single nitrogen stress was beneficial to the enrichment of Nitrospina, while the nitrogen and phosphorus stresses under salt conditions were favorable for the enrichment of Nitrosomonas and Nitrospina. Furthermore, the abundance of denitrifying Halomonas showed a decreasing trend under exogenous nutrient stress, indicating that it was sensitive to environmental changes. Denitrifying bacteria Salinimicrobium was relatively stable and had good environmental adaptability, whereas the abundance of denitrifying MarinobacterIdiomarina, and methane-oxidizing Methylohalomonas increased. The complexity of co-existence network significantly increased under no-salt and single nitrogen or phosphorus stress. The adding nutrients reduced the utilization of xenobiotics by microorganisms. Exogenous pollutants without salinity would increase the abundance of gene encoding repair. Moreover, the nitrogen and phosphorus stresses without salinity could increase the denitrification and methane oxidation of microorganisms. However, the single nitrogen or phosphorus stress promoted the denitrification and methane oxidation, whereas the nitrogen and phosphorus stresses played a suppressive role under salinity conditions. Results provide ecological references for restoration of potential nutrient pollution in coastal wetlands.

Keywords: Nitrogen and phosphorus, Microbial community, Functional potential, Coastal wetland, Salinity.

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