太湖沉积物产甲烷速率时空变化与影响因素

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摘要选取我国太湖作为研究对象,采集沉积物样品进行室内培养试验,研究太湖沉积物产甲烷速率(MPR)的时空变化特征,并分析主导差异产生的水体或沉积物环境因素.结果表明,太湖沉积物MPR为0.007~176.03μmol/(L·d),其中西北湖湾区与东太湖区MPR相对较高,而湖心开阔区MPR相对较低;MPR季节变化显著,夏季最高,平均为(42.85 ± 40.45)μmol/(L·d),冬季最低、平均为(5.26 ± 17.29)μmol/(L·d).MPR与水温、沉积物的含水率、孔隙度、总氮和有机碳等指标呈显著正相关.各点位MPR的温度敏感性(Q₁₀)存在差异,Q₁₀与MPR呈显著对数负相关.微生物群落分析显示太湖夏季沉积物中产甲烷菌属整体以氢营养型为主,mcrA基因拷贝数与MPR呈显著性正相关.本研究可为太湖CH₄产生、排放、碳循环研究以及其他湖泊沉积物MPR的研究提供重要参考.

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	李彤
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	刘成
	钟继承
	张雷

关键词 ：太湖, 沉积物, 产甲烷速率, 产甲烷菌, 时空变化

Abstract：Researches on lake methane (CH₄) production are of great significance for understanding the global CH₄ budget since lakes are important releasing sources for CH₄. In this study, sediment samples were firstly collected from Lake Taihu China then incubated in the laboratory with the purpose of investigating the temporal and spatial variations of the sediment methane production rates (MPR) in the lake. The environmental factors influencing the production rates were also analyzed. The results showed that MPR in sediments from Lake Taihu was 0.007~176.03μmol/(L·d). Higher MPR were found in the northwest bays and the eastern areas, while MPR in the open areas of Lake Taihu were relatively lower. The MPR in the sediments significantly varied from seasons, with the highest value of (42.85 ± 40.45) μmol/(L·d) in summer and the lowest of (5.26 ± 17.29) μmol/(L·d) in winter. The sediment MPR was positively correlated with the water temperature, the sediment water content, the porosity, the total nitrogen and the organic carbon. Differences of the temperature sensitivity (Q₁₀) for sediment MPR were found from different sampling sites. A significant negative logarithmic correlation between Q₁₀ and MPR was proofed. Microbial community analysis showed that hydrogenotrophic microorganisms dominated the methanogens in sediments of Lake Taihu during the summer. The copy number of the mcrA gene was significantly positively correlated with the sediment MPR. This study would provide important references to the studies of CH₄ production, emission and carbon cycle in Lake Taihu and the sediment MPR in other lakes.

Key words： Lake Taihu lake sediments methane production rate methane spatiotemporal variation

收稿日期: 2024-06-03

PACS:

X524

基金资助:国家自然科学基金资助项目(42177228,42077310)

通讯作者: 张雷,副研究员,leizhang@niglas.ac.cn E-mail: leizhang@niglas.ac.cn

作者简介: 李彤(1999-),女,山东临沂人,中国科学院南京地理与湖泊研究所硕士研究生,研究方向为湖泊环境地球化学.licu548664@163.com.

引用本文:

李彤, 丁立飞, 魏文欣, 樊施明, 刘成, 钟继承, 张雷. 太湖沉积物产甲烷速率时空变化与影响因素[J]. 中国环境科学, 2025, 45(1): 519-527. LI Tong, DING Li-fei, WEI Wen-xin, FAN Shi-ming, LIU Cheng, ZHONG Ji-cheng, ZHANG Lei. Temporal and spatial variations of sediment methane production rates and their influencing factors in Lake Taihu. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(1): 519-527.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2025/V45/I1/519

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