Aerenchyma in emergent plants and rhizospheric microbial communities promote methane fluxes in wetlands

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Shaozhuang Guo, Songhe Zhang, Xin Lv, Hezhou Chen, Jie Chen, Junfeng Gao, Wenming Zhang
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Abstract

Wetlands are the largest natural source of CH4 globally, yet our understanding of how environmental parameters and microorganisms affect the production and emission of CH4 in emergent plant–sediment systems remains limited. In this study, CH4 fluxes were investigated in a wetland with Canna indica for 42 d, as well as nutrients and microbial community. It was found that the chimney effect formed by aerenchyma in roots, stems, and leaves of C. indica promoted the emission and oxidation of CH4 in the wetland and reduced the CH4 concentration in sediments. Canna indica reduced the nutrient release from surface sediments into the overlying water. Pearson correlation analysis showed that temperature, pH, and oxidation–reduction potential were the main influencing factors for CH4 production and oxidation in the wetland. Canna indica inhibited the diversity of archaeal community but promoted the diversity of bacterial community in the rhizosphere. Stochastic processes had a greater impact on bacterial and archaeal succession trajectories in wetland sediments. Network analysis showed that C. indica promoted interactions among bacteria and archaea that enhanced their ability to resist environmental interference. The well-developed aerenchyma of C. indica provided an important passage for the transport of CH4 from sediments to the atmosphere and shaped the microbial community structure in the rhizosphere. Meanwhile, CH4 emissions were also constrained by several variables, such as temperature and physiological adaptation in the long term. Thus, it is necessary to plant emergent plants in areas with low CH4 emissions and optimize plant configuration in the context of global warming.

出水植物的根瘤和根瘤微生物群落促进湿地甲烷通量
湿地是全球最大的甲烷(CH4)天然来源,但我们对环境参数和微生物如何影响新生植物-沉积物系统中甲烷(CH4)的产生和排放的了解仍然有限。在这项研究中,研究人员在一个生长了 42 d 鳉鱼的湿地中调查了甲烷通量以及营养物质和微生物群落。研究发现,茜草根、茎和叶中的气孔形成的烟囱效应促进了湿地中 CH4 的排放和氧化,并降低了沉积物中的 CH4 浓度。美人蕉减少了表层沉积物向上层水体的养分释放。皮尔逊相关分析表明,温度、pH值和氧化还原电位是湿地中CH4产生和氧化的主要影响因素。坎儿井抑制了根圈中古细菌群落的多样性,但促进了细菌群落的多样性。随机过程对湿地沉积物中细菌和古细菌演替轨迹的影响更大。网络分析表明,籼稻促进了细菌和古细菌之间的相互作用,增强了它们抵抗环境干扰的能力。籼稻发达的根瘤为CH4从沉积物向大气传输提供了重要通道,并塑造了根瘤菌圈的微生物群落结构。同时,CH4的排放也受到温度和生理适应等多个变量的长期制约。因此,在全球变暖的背景下,有必要在CH4排放量低的地区种植新生植物,并优化植物配置。
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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