大黑汀水库夏秋季节温室气体赋存及排放特征  

Characteristics of greenhouse gas occurrence and emission in summer and autumn of Daheiting Reservoir

作　　者：龚琬晴 文帅龙 王洪伟 吴涛[3] 李鑫 钟继承[1] GONG Wan-qing;WEN Shuai-long;WANG Hong-wei;WU Tao;LI Xin;ZHONG Ji-cheng(State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Lakes,Chinese Academy of Sciences,Nanjing 210008,China;University of Chinese Academy of Sciences,Beijing 100049,China;Tianjin Hydraulic Research Institute,Tianjin 300061,China;College of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,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]天津市水利科学研究院,天津300061 [4]苏州科技大学环境科学与工程学院,江苏苏州215009

出　　处：《中国环境科学》2019年第11期4611-4619,共9页China Environmental Science

基　　金：国家自然科学基金资助项目(41371457,41771516);天津市水利科学院研究院项目(2017SZC-C-89)

摘　　要：以北方典型富营养化水库-大黑汀水库水体为研究对象,在2018年夏季和秋季采用顶空平衡法对其表层35个点位水体溶解的二氧化碳(CO2)、甲烷(CH4)和氧化亚氮(N2O)浓度进行测定,并对水库水-气界面扩散通量进行了估算.结果表明夏季和秋季大黑汀水库表层水体的CO2、CH4和N2O整体上均表现为过饱和状态,夏季表层水体CO2溶存浓度和扩散通量均值分别为(72.75±67.49)μmol/L和(810.62±790.64)μmol/(m^2·h);秋季CO2溶存浓度和扩散通量均值分别为(394.64±104.13)μmol/L和(4822.81±1250.00)μmol/(m^2·h);夏季CH4平均浓度和扩散通量分别为(0.19±0.12)μmol/L和(3.04±2.10)μmol/(m^2·h),秋季CH4平均浓度和扩散通量分别为(0.41±0.26)μmol/L和(5.16±3.23)μmol/(m^2·h);夏季N2O溶存浓度和扩散通量均值分别为(0.03±0.01)μmol/L和(0.31±0.10)μmol/(m^2·h),秋季N2O溶存浓度和扩散通量均值分别为(0.03±0.01)μmol/L和(0.25±0.15)μmol/(m^2·h).相关性分析结果表明大黑汀水库夏季表层水体CO2及N2O浓度主要受水温、水深和电导率影响,CH4浓度主要受水深及电导率影响;水库秋季表层水体CO2溶存浓度主要受水温、水深和TDS影响,CH4浓度主要受水温、水深和TDS影响,N2O浓度主要受水深影响.As a typical entrophic reservoir in North China,the surface water of 27 sites in Daheting Reservoir was sampled and the concentrations of surface dissolved carbon dioxide(CO2),methane(CH4)and nitrous oxide(N2O)were determined by using headspace equilibrium method,to estimate its water-gas interface diffuse flux in the summer and autumn in 2018.Results indicated that the surface of Daheiting Reservoir was mainly a source of CO2,CH4 and N2O.The mean values of CO2 concentration and diffusion flux were(72.75±67.49)μmol/L and(810.62±790.64)μmol/(m^2·h)in summer,and were(394.64±104.13)μmol/L and(4822.81±1250.00)μmol/(m^2·h)in antumn,respectively.The mean concentration and diffusion flux of CH4 were(0.19±0.12)μmol/L and(3.04±2.10)μmol/(m^2·h)in summer,and were(0.41±0.26)μmol/L and(5.16±3.23)μmol/(m^2·h)in autumn,respectively.The mean values of N2O concentration and diffusion flux were(0.03±0.01)μmol/L and(0.31±0.10)μmol/(m^2·h)in summer,and were(0.03±0.01)μmol/L and(0.25±0.15)μmol/(m^2·h)in autumn,respectively.The results of correlation analysis indicated that the concentrations of dissolved CO2 and N2O were mainly correlated with temperature,water depth and conductivity,while CH4 concentration was mainly correlated with water depth and conductivity in summer.Concentrations of dissolved CO2 was mainly correlated with temperature,water depth and TDS,while CH4 concentration was mainly correlated with temperature,water depth and TDS,while N2O concentration was mainly correlated with water depth.

关 键 词：温室气体 溶存浓度 通量 影响因素 大黑汀水库 

分 类 号：X511[环境科学与工程—环境工程]