不同营养条件下湖泊沉积物微生物相互作用模式和氮循环规律,Science of the Total Environment

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不同营养条件下湖泊沉积物微生物相互作用模式和氮循环规律
Science of the Total Environment ( IF 8.2 ) Pub Date : 2023-10-19 , DOI: 10.1016/j.scitotenv.2023.167926
Ziwei Wang ₁ , Xiaohong Ruan ₁ , Rongfu Li ₁ , Yaping Zhang ₁

Affiliation

探索氮（N）循环微生物如何在富营养化湖泊沉积物中相互作用以及生物元素如何影响氮循环对于理解生物地球化学循环和氮积累机制至关重要。本研究从2015年至2017年四个季节的不同营养条件的太湖不同区域采集了沉积物样品。利用高通量测序和分子生态网络分析，研究了微生物相互作用模式和氮循环的作用。存在于不同营养条件的湖泊沉积物中。结果表明，不同营养条件的湖区沉积物微生物网络结构不同。在富营养化程度较高的区域，网络指数表明微生物群落的能量、物质和信息传递效率较高，竞争更加激烈，生态位分化较弱。中度富营养区的沉积环境较中营养区表现出更大的反硝化、硝化和厌氧氨氧化潜力，但也更容易发生氮功能微生物之间的抑制和脱氮过程的限制。网络的拓扑结构表明，碳（C）、硫（S）和铁（Fe）循环对两个湖区的氮循环都有很强的影响。在中度富营养化湖区，C-和S-循环功能细菌促进了固氮-硝化-DNRA（异化硝酸盐还原为铵）耦合过程的闭合循环，并减少了氮的去除。在中营养湖区，C、S循环功能菌同时促进固氮和矿化，铁循环功能菌与反硝化菌的结合增强了固氮和矿化产物的脱氮过程。这项研究提高了对不同营养条件下湖泊沉积物氮循环机制的理解。

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Microbial interaction patterns and nitrogen cycling regularities in lake sediments under different trophic conditions

Exploring how nitrogen (N) cycling microbes interact in eutrophic lake sediments and how biogenic elements influence the nitrogen cycle is crucial for understanding biogeochemical cycles and nitrogen accumulation mechanisms. In this study, sediment samples were collected from various areas of Taihu Lake with different trophic conditions in all four seasons from 2015 to 2017. Using high-throughput sequencing and molecular ecological network analysis, we investigated the microbial interaction patterns and the role of nitrogen cycling in sediments from lakes with different trophic conditions. The results showed distinct structures of sediment microbial networks between lake areas with different trophic conditions. In the more eutrophic region, network indices indicate higher transfer efficiency of energy, material, and information, more significant competition, and weaker niche differentiation of the microbial community. The sedimentary environment in the moderately eutrophic area exhibited greater potential for denitrification, nitrification, and anammox compared to the mesotrophic area, but the inhibition between N functional microbes and limitations in N removal processes were also more likely to occur. The topological structure of the networks showed that the carbon (C), sulfur (S), and iron (Fe) cycles had a strong influence on the nitrogen cycle in both lake areas. In the moderately eutrophic lake area, C- and S-cycling functional bacteria facilitated a closed cycle of the coupled N fixation–nitrification–DNRA (dissimilatory nitrate reduction to ammonium) process and reduced N removal. In the mesotrophic lake area, C- and S-cycling functional bacteria promoted both N fixation and mineralization, and Fe-cycling functional bacteria coupled with denitrifiers enhanced the nitrogen removal process of products from nitrogen fixation and mineralization. This study improved the understanding of the nitrogen cycling mechanism in lake sediments under different trophic conditions.

更新日期：2023-10-19

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