太湖沉积物产甲烷速率时空变化与影响因素  

Temporal and spatial variations of sediment methane production rates and their influencing factors in Lake Taihu

作　　者：李彤 丁立飞 魏文欣 樊施明 刘成[1] 钟继承[1] 张雷[1] LI Tong;DING Li-fei;WEI Wen-xin;FAN Shi-ming;LIU Cheng;ZHONG Ji-cheng;ZHANG Lei(State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;University of Chinese Academy of Sciences,Beijing 100049,China;:School of Environmental Science and Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室,江苏南京210008 [2]中国科学院大学,北京100049 [3]南京信息工程大学环境科学与工程学院,江苏南京210044

出　　处：《中国环境科学》2025年第1期519-527,共9页China Environmental Science

基　　金：国家自然科学基金资助项目(42177228,42077310)。

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(Q_(10))存在差异,Q_(10)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CH_(4)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.Researches on lake methane(CH_(4))production are of great significance for understanding the global CH_(4) budget since lakes are important releasing sources for CH_(4).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(Q_(10))for sediment MPR were found from different sampling sites.A significant negative logarithmic correlation between Q_(10) 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 CH_(4) production,emission and carbon cycle in Lake Taihu and the sediment MPR in other lakes.

关 键 词：太湖 沉积物 产甲烷速率 产甲烷菌 时空变化 

分 类 号：X524[环境科学与工程—环境工程]