浅水湖泊溶存甲烷浓度对气温升高及季节变化响应特征OA北大核心CSTPCD
Response of Dissolved Methane Concentration(dCH4)to Climate Warming and Seasonal Changes in Shallow Lakes
揭示温度升高对浅水湖泊中溶存甲烷(CH4)浓度的影响,可为更好地应对气候变化对浅水湖泊碳排放的影响提供数据支持.采集梁子湖表层沉积物和湖水,并置于塑料水缸(沉积物厚度为10 cm,其上注入深度为1 m的湖水),设置比周围环境温度高3.5℃的升温组(W)和不进行温度设置的控制组(C),每组6个平行,2022年1月完成系统设置后放置2个月,在春季(3、4月)和夏季(7、8月)进行样品采集并计算溶存甲烷浓度,同时测量水温(T)、pH、电导率(EC)、溶解氧(DO)、总氮(TN)、总磷(TP)、正磷(PO43-)、氨态氮(NH4+)、硝态氮(NO3-)和亚硝氮(NO2-)、Chl-a、溶解性有机碳(DOC)等参数,并分析溶存甲烷浓度和环境因子的相关关系.结果显示,W组的甲烷浓度与C组之间差异不显著,W组的甲烷浓度总体上低于C组;夏季甲烷的浓度显著高于春季,说明温度是影响甲烷排放的重要因素;Spearman相关性分析和逐步回归分析表明溶存甲烷浓度主要与T、营养盐含量(TP、PO43-、DOC)、pH、DO和EC有关,其中,季节性温度变化是影响水体溶存甲烷浓度的最主要环境因子.
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.
马世旺;袁丹妮;汪洋;乐静全;张开瑞;李思悦
武汉工程大学环境生态与生物工程学院,湖北武汉 430205
环境科学
溶存甲烷浓度升温季节变化浅水湖泊
dissolved methane concentrationwarmingseasonal changesshallow lakes
《水生态学杂志》 2024 (003)
1-9 / 9
国家自然科学基金面上项目(42071368);国家自然科学基金联合基金重点项目(U2033216).
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