夏季闽江口鳝鱼滩湿地潮汐过程中溶解态碳动态  

Variations of Dissolved Carbon in Shanyutan Wetland of the Minjiang Estuary during Tidal Cycles in Summer

作　　者：雷佩 黄佳芳[1,2,3] 郭利果 李晓 张雨生[1] 孙杰 李小飞[5] 钱伟[1,2,3] LEI Pei;HUANG Jiafang;GUO Liguo;LI Xiao;ZHANG Yusheng;SUN Jie;LI Xiaofei;QIAN Wei(School of Carbon Neutrality Future Technology/School of Geographical Science,Fujian Normal University,Fuzhou 350117,China;Institute of Geography,Fujian Normal University,Fuzhou 350117,China;Fujian Minjiang Estuary Wetland Ecosystem National Monitoring and Research Station,National Forestry and Grassland Administration,Fuzhou 350215,China;State Key Laboratory of Marine Environmental Science,Xiamen University,Xiamen 361102,China;State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200241,China)

机构地区：[1]福建师范大学地理科学学院/碳中和未来技术学院,福建福州350117 [2]福建师范大学地理研究所,福建福州350117 [3]福建闽江河口湿地生态系统国家定位观测研究站(国家林业和草原局),福建福州350215 [4]近海海洋环境科学国家重点实验室(厦门大学),福建厦门361102 [5]河口海岸学国家重点实验室(华东师范大学),上海200241

出　　处：《福建师范大学学报（自然科学版）》2024年第5期95-101,共7页Journal of Fujian Normal University：Natural Science Edition

基　　金：国家自然科学基金资助项目(42071130);福建省自然科学基金资助项目(2022J01618);福建省省属公益类科研院所基本科研专项(2021R1002007、2022R1002007)。

摘　　要：潮汐过程中溶解态碳的动态变化是理解湿地碳侧向输出和完善湿地碳计量的关键。以闽江河口湿地受潮汐影响的潮沟为研究对象,测定并分析潮汐过程中溶解有机碳(DOC)、溶解无机碳(DIC)、碱度(TA)、紫外可见吸收光谱参数(α355,SUVA 254,S 275-295)的动态变化。结果表明:DOC和DIC在潮汐过程中呈现明显变化,低潮位时DOC、DIC分别为1353、3726μmol·L^(-1),高潮位时降低至233、940μmol·L^(-1),DIC、DOC及TA均与潮高呈显著负相关。潮汐过程中DIC与DOC输出比例约为1.6。光谱参数(α355,SUVA 254)在潮汐过程中有明显变化特征,可作为示踪潮汐过程溶解有色有机物变化的手段。DIC和TA增加量的比值(~0.96)指示反硝化或硫酸盐还原是维持DIC产生的主要生物地球化学过程。The dynamic changes of dissolved carbon during tidal cycles are critical to understanding carbon lateral export and refining carbon measurement in wetlands.The variations including dissolved organic carbon,dissolved inorganic carbon,alkalinity,and UV-visible absorption spectral parameters(α355,SUVA 254,S 275-295)during the tidal cycles were investigated in a creek within the Shanyutan wetland of the Minjiang River estuary.The results showed remarkable variations:DOC and DIC values were 1353,3726μmol·L^(-1) during ebb tide and 233,940μmol·L^(-1) during flood tide for DOC and DIC,respectively,and also possessed significant negative correlations with tidal height.The ratio of DIC to DOC export during the tidal process was~1.6.The spectral parameters(α355 and SUVA 254)varied significantly during tidal cycles and can be applied as tracers for the dynamics of the chromophoric dissolved organic matter during tides.Inferred from the stoichiometric relationship between DIC and TA(~0.96),the sulfate reduction processes and/or denitrification might serve as main mechanisms for inorganic carbon export.

关 键 词：潮汐 溶解有机碳 溶解无机碳 碱度 湿地 碳循环 

分 类 号：X171[环境科学与工程—环境科学]