盐度升高降低了松嫩平原湿地微生物群落复杂性和碳、氮、磷代谢

IF 12.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2025-02-11 DOI:10.1016/j.watres.2025.123285

Shouyang Luo , Jiabao Yuan , Yanyu Song , Jiusheng Ren , Jia Qi , Mengyuan Zhu , Yisong Feng , Mengting Li , Bowen Wang , Xiaoyu Li , Changchun Song

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引用次数: 0

摘要

盐度会引起土壤微生物群落结构和功能的变化，而微生物群落在土壤碳(C)、氮(N)和磷(P)循环中起着重要作用。然而，高盐度环境下湿地土壤微生物群落与功能特性之间的关系研究较少。本研究以松嫩平原扎龙、莫莫格、牛心淘宝和相海湿地为研究样本，在不同盐度条件下进行土壤培养，通过宏基因组测序分析盐度对微生物的总体影响。结果表明，土壤盐分的增加降低了土壤微生物的多样性，并显著改变了其组成。盐度升高导致核心物种鞘单胞菌（Sphingomonas）被嗜盐物种（Halomonadaceae, Halomohas campaniensis）取代，降低了微生物生态网络的稳定性。固碳、反硝化和嘌呤代谢是松嫩平原湿地维持C、N、P功能的主要途径，这些过程随着盐度的增加而显著降低。参与C、N、P代谢的关键基因有EC1.1.1.42、EC4.1.1.31、EC6.4.1.1、nosZ、nirK、purB、purC、adk、purM、purQ。由于盐度的增加，它们都被有效地抑制了。综上所述，盐度升高降低了微生物的复杂性，抑制了C、N、P循环的相关功能，影响了湿地生态系统的稳定性。加强湿地保护，防止盐碱化加剧。该研究为未来全球变化背景下盐碱化湿地生态系统的恢复与管理提供了新的科学框架。

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Elevated salinity decreases microbial communities complexity and carbon, nitrogen and phosphorus metabolism in the Songnen Plain wetlands of China

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Elevated salinity decreases microbial communities complexity and carbon, nitrogen and phosphorus metabolism in the Songnen Plain wetlands of China

Salinity can induce changes in the structure and function of soil microbial communities, which plays an important role in soil carbon (C), nitrogen (N) and phosphorus (P) cycling. However, there are few studies on the relationship between microbial communities and functional properties of wetland soil under elevated salinity. In this study, soil samples from Zhalong, Momoge, Niuxintaobao, and Xianghai wetlands in the Songnen Plain of China were cultured with different salinity and analyzed by metagenomic sequencing to assess the overall impact of salinity on microorganisms. The results showed that increasing soil salinity decreased soil microbial diversity and significantly changed its composition. Elevated salinity led to the replacement of core species (Sphingomonas) by halophilic species (Halomonadaceae, Halomohas campaniensis), reducing the stability of microbial ecological networks. C fixation, denitrification and purine metabolism were the key ways for the maintenance of C, N and P functions in Songnen plain wetlands, and these processes were significantly reduced with increasing salinity. Key genes involved in C, N and P metabolism include EC1.1.1.42, EC4.1.1.31, EC6.4.1.1, nosZ, nirK, purB, purC, adk, purM, and purQ. They were all effectively suppressed due to increased salinity. In summary, elevated salinity reduced the complexity of microorganisms and inhibited the related functions of C, N and P cycling, and affected the stability of wetland ecosystems. Wetland protection should be strengthened to prevent the aggravation of salinization. This study provides a new scientific framework for the restoration and management of salinized wetland ecosystems in the face of upcoming global changes.

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.