Atmospheric Trace Gas Oxidizers Contribute to Soil Carbon Fixation Driven by Key Soil Conditions in Terrestrial Ecosystems

IF 10.8 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL 环境科学与技术 Pub Date : 2024-10-23 DOI:10.1021/acs.est.4c06516
Yongfeng Xu, Ying Teng, Shixiang Dai, Jing Liao, Xia Wang, Wenbo Hu, Zhiying Guo, Xianzhang Pan, Xiyang Dong, Yongming Luo
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Abstract

Microbial oxidizers of trace gases such as hydrogen (H2) and carbon monoxide (CO) are widely distributed in soil microbial communities and play a vital role in modulating biogeochemical cycles. However, the contribution of trace gas oxidizers to soil carbon fixation and the driving environmental factors remain unclear, especially on large scales. Here, we utilized biogeochemical and genome-resolved metagenomic profiling, assisted by machine learning analysis, to estimate the contributions of trace gas oxidizers to soil carbon fixation and to predict the key environmental factors driving this process in soils from five distinct ecosystems. The results showed that phylogenetically and physiologically diverse H2 and CO oxidizers and chemosynthetic carbon-fixing microbes are present in the soil in different terrestrial ecosystems. The large-scale variations in soil carbon fixation were highly positively correlated with both the abundance and the activity of H2 and CO oxidizers (p < 0.05–0.001). Furthermore, soil pH and moisture-induced shifts in the abundance of H2 and CO oxidizers partially explained the variation in soil carbon fixation (55%). The contributions of trace gas oxidizers to soil carbon fixation in the different terrestrial ecosystems were estimated to range from 1.1% to 35.0%. The estimated rate of trace gas carbon fixation varied from 0.04 to 1.56 mg kg–1 d–1. These findings reveal that atmospheric trace gas oxidizers may contribute to soil carbon fixation driven by key soil environmental factors, highlighting the non-negligible contribution of these microbes to terrestrial carbon cycling.

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大气痕量气体氧化剂有助于陆地生态系统关键土壤条件驱动的土壤碳固定
氢气(H2)和一氧化碳(CO)等痕量气体的微生物氧化剂广泛分布于土壤微生物群落中,在调节生物地球化学循环方面发挥着重要作用。然而,痕量气体氧化剂对土壤碳固定的贡献和驱动环境因素仍不清楚,尤其是在大尺度上。在此,我们利用生物地球化学和基因组解析元基因组剖析,并辅以机器学习分析,估算了痕量气体氧化剂对土壤碳固定的贡献,并预测了五个不同生态系统土壤中驱动这一过程的关键环境因素。研究结果表明,不同陆地生态系统的土壤中存在系统发育和生理上多样化的 H2 和 CO 氧化剂以及化合固碳微生物。土壤碳固定的大规模变化与 H2 和 CO 氧化剂的丰度和活性高度正相关(p < 0.05-0.001)。此外,土壤 pH 值和水分引起的 H2 和 CO 氧化剂丰度变化也部分解释了土壤碳固定的变化(55%)。据估计,在不同的陆地生态系统中,痕量气体氧化剂对土壤碳固定的贡献率从 1.1% 到 35.0% 不等。痕量气体碳固定的估计速率从 0.04 到 1.56 mg kg-1 d-1 不等。这些研究结果表明,大气中的痕量气体氧化剂可能会在关键土壤环境因子的驱动下促进土壤碳固定,突出了这些微生物对陆地碳循环不可忽视的贡献。
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来源期刊
环境科学与技术
环境科学与技术 环境科学-工程:环境
CiteScore
17.50
自引率
9.60%
发文量
12359
审稿时长
2.8 months
期刊介绍: Environmental Science & Technology (ES&T) is a co-sponsored academic and technical magazine by the Hubei Provincial Environmental Protection Bureau and the Hubei Provincial Academy of Environmental Sciences. Environmental Science & Technology (ES&T) holds the status of Chinese core journals, scientific papers source journals of China, Chinese Science Citation Database source journals, and Chinese Academic Journal Comprehensive Evaluation Database source journals. This publication focuses on the academic field of environmental protection, featuring articles related to environmental protection and technical advancements.
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