| 引用本文: | 闫兴成,张重乾,季铭,王明玥,冉珊珊,许晓光,王国祥.富营养化湖泊夏季表层水体温室气体浓度及其影响因素.湖泊科学,2018,30(5):1420-1428. DOI:10.18307/2018.0523 |
| YAN Xingcheng,ZHANG Zhongqian,JI Ming,WANG Mingyue,RAN Shanshan,XU Xiaoguang,WANG Guoxiang.Concentration of dissolved greenhouse gas and its influence factors in the summer surface water of eutrophic lake. J. Lake Sci.2018,30(5):1420-1428. DOI:10.18307/2018.0523 |
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| 富营养化湖泊夏季表层水体温室气体浓度及其影响因素 |
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闫兴成1,2, 张重乾1,2, 季铭1,2, 王明玥1,2, 冉珊珊1,2, 许晓光1,2, 王国祥1,2
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1.南京师范大学环境学院, 南京 210023;2.江苏省地理信息资源开发与利用协同创新中心, 江苏省环境演变与生态建设重点实验室, 江苏省水土环境生态修复工程实验室, 南京 210023
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| 摘要: |
| 为研究富营养化湖泊水体温室气体浓度及其影响因素，以太湖西岸和竺山湾为例，共调查研究了27个点位，采用顶空平衡法对其表层水体中溶解的甲烷（CH4）和氧化亚氮（N2O）浓度进行测定.结果表明，太湖近岸带蓝藻水华堆积区表层水体中CH4和N2O两种温室气体浓度远远高于开阔湖区点位，CH4和N2O最高浓度分别为3.79±0.095和0.078±0.003 μmol/L.蓝藻水华堆积区和开阔湖区CH4平均浓度分别为2.33±1.46和0.14±0.059 μmol/L，N2O的平均浓度分别为0.054±0.024和0.023±0.012 μmol/L.两种气体在水中均呈现过饱和状态，其中蓝藻水华堆积区表层水体中CH4和N2O饱和度远远高于开阔湖区点位.此外，入湖河流河口区域表层水体溶解性N2O浓度较高.将水中CH4和N2O浓度与水体环境因子之间进行相关性分析，表明水体总氮、总磷、铵态氮和溶解性有机碳浓度与CH4和N2O浓度呈显著正相关，CH4浓度与硝态氮浓度呈显著负相关.研究结果揭示了太湖蓝藻水华堆积区是CH4和N2O两种温室气体重要的潜在排放源，蓝藻水华暴发对湖泊温室气体的排放具有重要影响，但该过程的驱动机制及影响因素仍需要进一步研究. |
| 关键词: 太湖 蓝藻暴发 表层水体 温室气体 影响因素 |
| DOI：10.18307/2018.0523 |
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| 基金项目:国家水体污染控制与治理科技重大专项（2017ZX07203-003）、江苏省太湖水环境综合治理科研项目（JSZC-G2014-212）、国家自然科学基金项目（41573061）、江苏省太湖水环境综合治理科研项目（TH2015202）、国家自然科学基金项目（41573105）和江苏省高等学校自然科学研究面上项目（17KJB170009）联合资助. |
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| Concentration of dissolved greenhouse gas and its influence factors in the summer surface water of eutrophic lake |
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YAN Xingcheng1,2, ZHANG Zhongqian1,2, JI Ming1,2, WANG Mingyue1,2, RAN Shanshan1,2, XU Xiaoguang1,2, WANG Guoxiang1,2
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1.School of Environment, Nanjing Normal University, Nanjing 210023, P. R. China;2.Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Jiangsu Key Laboratory of Environmental Change and Ecological Construction, Jiangsu Engineering Laboratory of Water and Soil Eco-remediation, Nanjing 210023, P. R. China
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| Abstract: |
| In order to study the concentration of dissolved greenhouse gas and its influence factors in the surface water of eutrophic lake, the west shore and Zhushan Bay of Lake Taihu were taken as an example. The concentrations of dissolved CH4 and N2O in the surface water of 27 sites were determined by using headspace equilibrium method. Results indicated that concentrations of dissolved CH4 and N2O in the cyanobacteria blooms accumulated zone were much higher than those from the open lake area, with the highest value of 3.79±0.095 and 0.078±0.003 μmol/L, respectively. The average concentrations of dissolved CH4 in the cyanobacteria blooms accumulated zone and open lake area were 2.33±1.46 and 0.14±0.059 μmol/L, and N2O concentration were 0.054±0.024 and 0.023±0.012 μmol/L, respectively. The two greenhouse gases were all over saturated in the study sites, and the saturability of the greenhouse gases in the cyanobacteria blooms accumulated zone was much higher than that from the open lake. Additionally, concentrations of N2O in the estuaries of inflow rivers were higher than other sites. The results of correlation analysis indicated that the concentrations of dissolved CH4 and N2O were significantly and positively correlated with total nitrogen, total phosphorus, ammonium nitrogen and dissolved organic carbon, while the concentrations of the dissolved CH4 was significantly and negatively correlated with nitrate nitrogen. This study indicated that the littoral zone, especially the cyanobacteria blooms accumulated zone plays a potential role in greenhouse gas emission from water to the atmosphere. Moreover, the occurrence of cyanobacteria blooms may facilitated the production of CH4 and N2O, but the driving mechanism and influence factors during this process need further investigations. |
| Key words: Lake Taihu cyanobacteria blooms surface water greenhouse gas influence factors |
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