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Impacts of large-scale aquaculture activities on the seawater carbonate system and air-sea CO2 flux in a subtropical mariculture bay, southern China

文献类型： 外文期刊

作者： Han, Tingting 1 ; Shi, Rongjun 1 ; Qi, Zhanhui 1 ; Huang, Honghui 1 ; Gong, Xiuyu 1 ;

作者机构： 1.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst,Minist Agr, Guangdong Prov Key Lab Fishery Ecol Environm, Key Lab South China Sea Fishery Resources Exploit, Guangzhou 510300, Peoples R China

2.Southern Marine Sci & Engn Guangdong Lab Guangzho, Guangzhou 511485, Peoples R China

关键词： Carbonate chemistry; Air-sea CO2 flux; F-CO2; Seaweed culture; Oyster culture; Shen'ao Bay

期刊名称：AQUACULTURE ENVIRONMENT INTERACTIONS （ 影响因子：3.074； 五年影响因子：3.475 ）

ISSN： 1869-215X

年卷期： 2021 年 13 卷

页码：

收录情况： SCI

摘要： In this study, the variations of the seawater carbonate system parameters and air-sea CO2 flux (F-CO2) of Shen'ao Bay, a typical subtropical aquaculture bay located in China, were investigated in spring 2016 (March to May). Parameters related to the seawater carbonate system and F-CO2 were measured monthly in 3 different aquaculture areas (fish, oyster and seaweed) and in a non-culture area near the bay mouth. The results showed that the seawater carbonate system was markedly influenced by the biological processes of the culture species. Total alkalinity was significantly lower in the oyster area compared with the fish and seaweed areas, mainly because of the calcification process of oysters. Dissolved inorganic carbon (DIC) and CO2 partial pressure (pCO(2)) were highest in the fish area, followed by the oyster and non-culture areas, and lowest in the seaweed area. Oysters and fish can have indirect influences on DIC and pCO(2) by releasing nutrients, which facilitate the growth of seaweed and phytoplankton and therefore promote photosynthetic CO2 fixation. For these reasons, Shen'ao Bay acts as a potential CO2 sink in spring, with an average F-CO2 ranging from -1.2 to -4.8 mmol m(-2) d(-1). CO2 fixation in the seaweed area was the largest contributor to CO2 flux, accounting for ca. 58% of the total CO2 sink capacity of the entire bay. These results suggest that the carbonate system and F-CO2 of Shen'ao Bay were significantly affected by large-scale mariculture activities. A higher CO2 sink capacity could be acquired by extending the culture area of seaweed.

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