水生态学杂志2024，Vol.45Issue(3)：1-9,9.DOI:10.15928/j.1674-3075.202308280236
浅水湖泊溶存甲烷浓度对气温升高及季节变化响应特征
Response of Dissolved Methane Concentration(dCH4)to Climate Warming and Seasonal Changes in Shallow Lakes
摘要
Abstract
Shallow lakes are a significant sources of methane(CH4)emissions.With the escalating greenhouse effect,global temperature is steadily rising,and the water temperature of lakes is rising accordingly.Previous research has shown that temperature is an important environmental factor affect-ing the dissolved methane concentration(dCH4)in water,but its precise implications remain uncer-tain.In this study,we investigated the impact of rising temperature on dCH4 in shallow lakes and ex-plored the driving forces causing the changes in dCH4.Surface sediments and lake water were collect-ed from Liangzi Lake,a typical subtropical shallow lake in Wuhan City and placed in plastic water tanks,with a sediment thickness of 10 cm and a water depth of 1 m.A comparative experiment was conducted in the experimental devices that included a warming group(W)with temperature rising constantly to 3.5℃ higher than the ambient environment and a control group(C),each with six repli-cates.After setting up the experimental devices in January 2022,water samples were collected from the tanks in March and April(spring),and in July and August(summer)of 2022 for determination of dCH4.Environmental factors including,water temperature(T),pH,electrical conductivity(EC),dis-solved oxygen(DO),total nitrogen(TN),total phosphorus(TP),orthophosphate(PO43-),ammonia ni-trogen(NH4+),nitrate nitrogen(NO3-),nitrite nitrogen(NO2-),Chl-a,and dissolved organic carbon(DOC)were also measured.We then analyzed the correlation between dCH4 and environmental fac-tors.The dCH4 in Group W was generally lower than that in Group C,but the difference was not sig-nificant.The dCH4 in both groups was significantly higher in summer,indicating that temperature does affect methane emissions.Spearman correlation analysis and stepwise regression analysis show that dCH4 was primarily related to water temperature,nutrient content(TP,PO43-,DOC),pH,DO,and EC.Among them,the seasonal temperature change was the most important environmental factor affecting dCH4 in water bodies.关键词
溶存甲烷浓度/升温/季节变化/浅水湖泊Key words
dissolved methane concentration/warming/seasonal changes/shallow lakes分类
资源环境引用本文复制引用
马世旺,袁丹妮,汪洋,乐静全,张开瑞,李思悦..浅水湖泊溶存甲烷浓度对气温升高及季节变化响应特征[J].水生态学杂志,2024,45(3):1-9,9.基金项目
国家自然科学基金面上项目(42071368) （42071368）
国家自然科学基金联合基金重点项目(U2033216). （U2033216）
