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贝类养殖区CO2释放量化新模型的应用研究

Study on the applications of a new model for quantifying CO2 emission in shellfish culture areas

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【作者】 蒋鑫坤李丽董双林

【Author】 JIANG Xinkun;LI Li;DONG Shuanglin;Key Laboratory of Mariculture,Ministry of Education; Ocean University of China;Function Laboratory for Marine Fisheries Science and Food Production Processes,Qingdao National Laboratory for Marine Science and Technology;

【通讯作者】 李丽;

【机构】 中国海洋大学教育部海水养殖重点实验室青岛海洋科学与技术试点国家实验室海洋渔业科学与食物产出过程功能实验室

【摘要】 海水贝类钙化过程将产生CO2,但由于不同养殖海区碳酸盐体系组成差异大,需要在考虑海区碳酸盐体系变化特征的基础上更精确地量化该过程导致的CO2释放量。本研究将各种生物地球化学过程中产生的CO2源/汇效应强度定义为Φ,在钙化作用过程中,Φcal值可表示特定海区水文条件下,贝壳钙化作用实际释放到大气中的CO2与该过程产生的CO2的比率。应用新碳酸盐化学模型计算结果显示:Φcal值呈现季节变化特点,胶州湾、桑沟湾和深澳湾的Φcal值均为夏季最低;养殖海区内碳酸盐系统的区域性差异可改变Φcal值,胶州湾、桑沟湾和深澳湾的平均Φcal值分别为0.79,0.72和0.72;在贝类主要生长季节(3―7月),养殖海区的Φcal值呈现下降趋势,此外,多项式拟合结果表明胶州湾海区该阶段Φcal值随温度的上升而降低。在温度高于18℃后,Φcal值下降的速度逐渐加快。Pearson相关分析表明,胶州湾内Φcal值与表层海水的CO2分压相关性极显著(P<0.01)。最后,基于模型计算的胶州湾内Φcal值水平,按胶州湾菲律宾蛤仔年产量3.2×105 t计,胶州湾养殖菲律宾蛤仔贝壳生长部分预计每年向大气中排放约1.084×105 t CO2。本研究初步证实Φcal可在考虑海区碳酸盐体系特征的基础上,更精确地量化贝类钙化作用导致的CO2释放量,为后续的贝类的碳源/碳汇过程研究提供一定的参考。

【Abstract】 The process of calcification of shellfish produces CO2.However,there are large differences in carbonate system compositions among different aquaculture areas.Thus,more rigorous carbonate chemistry modeling,including concurrent changes in seawater carbonate systems,is needed to quantify the CO2 released into the atmosphere during calcification.In this study,the ratio between the CO2 emitted into the atmosphere during various biogeochemical processes and the CO2 produced by these processes is defined asΦ.Therefore,in the calcification process,the Φcal value represents the amount of CO2 emitted from the seawater to the atmosphere when 1 mol of CaCO3 is formed during shell growth.Results showed that Φcal value varied among seasons.The Φcal value was lowest during summer in Jiaozhou Bay,Sanggou Bay,and Shenao Bay.Regional differences in the carbonate system in the aquaculture sea area could change the Φcal value.In Jiaozhou Bay,0.79 mol CO2 was released into the atmosphere for every 1 mol CaCO3 deposited during shell growth.In Sanggou Bay and Shenao Bay,this value was 0.72.In Jiaozhou Bay,the Φcal value decreased in the shellfish’s main growing season (from March to July).The result of polynomial fitting further suggested that theΦcal value decreased with the temperature rise during this season.The Φcal value decreased faster when the water temperature exceeded 18℃.Finally,the annual production of 3.2×105 tons of Philippine clams in Jiaozhou Bay was expected to emit about 1.084×105 tons of CO2 into the atmosphere due to shell growth.This study preliminarily confirmed that Φcal,including concurrent changes in the seawater carbonate system in the aquaculture area,could better quantify the CO2 release caused by shellfish calcification.This study could provide some references for future studies on the topic of the carbon source/sink process of shellfish.

【基金】 山东省自然科学基金项目(ZR2020MC194)
  • 【文献出处】 中国水产科学 ,Journal of Fishery Sciences of China , 编辑部邮箱 ,2022年12期
  • 【分类号】S968.3
  • 【下载频次】44
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