下三横山岛养殖海域海-气界面CO_(2)交换通量的空间分布特征及影响因素  

Characteristics and influencing factors of spatial distribution of CO_(2) exchange flux at sea-air interface in the aquaculture area of Xiasanhengshan Island

作　　者：常佳楠 张建琳 段元亮 沈亦非 沈茜妤 赵爽 张梅菁 赵子滔 何培民 CHANG Jianan;ZHANG Jianlin;DUAN Yuanliang;SHEN Yifei;SHEN Qianyu;ZHAO Shuang;ZHANG Meijing;ZHAO Zitao;HE Peimin(College of Marine Ecology and Environment,Shanghai Ocean University,Shanghai 201306,China;Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources,Shanghai Ocean University,Ministry of Education,Shanghai 201306,China;Water Environment and Ecology Engineering Center of Shanghai Institute of Higher Education,Shanghai Ocean University,Shanghai 201306,China;Key Laboratory of Marine Ecological Monitoring and Restoration Technologies,Ministry of Natural Resources,Shanghai 201206,China;Fisheries Institute of Sichuan Academy of Agricultural Sciences,Chengdu 610066,China)

机构地区：[1]上海海洋大学海洋生态与环境学院,上海201306 [2]上海海洋大学水产种质资源发掘与利用教育部重点实验室,上海201306 [3]上海海洋大学水域环境生态上海高校工程研究中心,上海201306 [4]自然资源部海洋生态监测与修复技术重点实验室,上海201206 [5]四川省农业科学院水产研究所,成都610066

出　　处：《海洋渔业》2023年第5期605-617,共13页Marine Fisheries

基　　金：国家重点研发计划(2018YFD0901500);上海市自然科学基金资助项目(21ZR1427400)。

摘　　要：为研究下三横山岛养殖海域海-气界面CO_(2)交换通量及影响因素,从2020年7月开始,在该海域开展为期一年(4次)的监测和分析,主要剖析其温度、盐度、pH、总碱度(TA)及水体中溶解无机碳(DIC)、溶解有机碳(DOC)、颗粒有机碳(POC)分布差异,估算下三横山岛养殖海域表层海水CO_(2)分压(pCO_(2))及海-气界面CO_(2)通量(FCO_(2))值,并分析pCO_(2)的影响因素,探讨下三横山岛该养殖海域海-气界面CO_(2)交换通量。结果表明,下三横山岛海域表层海水4个季节的温度、盐度、pH、TA、DIC、DOC、POC的分布在季节上差异极显著(P<0.01)。下三横山岛海域pCO_(2)全年的变化范围为29.93~836.80μatm,FCO_(2)值的变化范围为-45.67~216.50 mmol·(m^(2)·d)^(-1)。pCO_(2)与FCO_(2)值四季变化显著(P<0.05),全年碳分布格局有较大差异,其中,仅春季为碳汇,碳汇强度为(-32.79±3.73)mmol·(m^(2)·d)^(-1),夏、秋、冬季皆为碳源,碳源强度分别为(14.74±33.35)mmol·(m^(2)·d)^(-1)、(18.39±6.63)mmol·(m^(2)·d)^(-1)、(50.34±9.27)mmol·(m^(2)·d)^(-1),其中,春、夏、秋季FCO_(2)最低值均出现在鱼类养殖区,最高值出现在贻贝养殖区。养殖区内的生物活动是影响下三横山岛海域表层海水pCO_(2)的重要因素。研究结果为下三横山岛多营养层级综合养殖的碳汇研究提供了前期数据及理论参考。In order to study the carbon flux and influencing factors in the aquaculture area of Xiasanhengshan Island,one-year monitoring and analysis was carried out from July 2020.The temperature,salinity,pH,total alkalinity(TA)and distribution differences of dissolved inorganic carbon(DIC),dissolved organic carbon(DOC)and particulate organic carbon(POC)in the water were mainly analyzed,the partial pressure of CO_(2)(pCO_(2))in the surface seawater and the flux value of CO_(2)(FCO_(2))at the sea-air interface in the aquaculture area of Xiasanhengshan Island were estimated,and the influencing factors of pCO_(2) were analyzed to explore the carbon sequestration capacity in the aquaculture area of Xiasanhengshan Island.In this study,field monitoring was performed on the sea area in summer(July),autumn(October),winter(January 2021)and spring(May 2021),and temperature,salinity,pH and surface water sample(0.5 m below the water surface)were collected.Water samples were collected and transported to the laboratory at 4℃ under dark conditions,and TA was measured by pH method.The water samples used for the determination of DIC,DOC and POC were filtered on site and the membrane was stored at -20℃.At the same time,the filtered water sample was stored in a brown glass bottle(preignition at 450℃ for 6 h),fixed in 0.02% saturated HgCl_2 solution,and stored at 4℃.DIC and DOC were determined by TOC-L.Carbon flux was estimated.After field and analytical data were obtained,data were pre-processed using Microsoft Excel software.Two-way ANOVA analysis and linear analysis were performed using Prism 8.0 software.The station map,concentration map and distribution map of pCO_(2) and FCO_(2) were all drawn using Surfer16.0 software.The results showed that the distributions of temperature,salinity,pH,TA,DIC,DOC,and POC in the surface seawater of Xiasanhengshan Island were significantly different in four seasons(P<0.01).The annual variation range of pCO_(2) was 29.93-836.8μatm,and the variation range of FCO_(2) value was from-45.67 to-216.5

关 键 词：下三横山岛 海水CO_(2)分压 海-气CO_(2)交换通量 海水养殖 

分 类 号：S968.4[农业科学—水产养殖]