Evaluating the attribution of bivalve-macroalgae polyculture as a carbon source or sink from an ecosystem perspective: A case study of kelp-oyster IMTA

文献类型： 外文期刊

第一作者： Xie, Yumeng

作者： Xie, Yumeng;Qin, Xiaofang;Fang, Jinghui;Zhang, Xiaowen;Fang, Jinghui;Xu, Jialei;Zhang, Yitao;Wang, Junwei

作者机构：

关键词： Polyculture; Carbon sink; Phytoplankton; Carbonate system; Nutrients

期刊名称：AQUACULTURE （ 影响因子：3.9； 五年影响因子：4.4 ）

ISSN： 0044-8486

年卷期： 2025 年 599 卷

页码：

收录情况： SCI

摘要： To clarify interactions among bivalves, macroalgae, and water column in the bivalve-macroalgae polyculture system, in-situ mesocosm cultivation was conducted for 24 h in both summer and winter. These experiments assessed seasonal variations in CO2 and components of dissolved inorganic carbon (DIC), nitrogen (DIN), and phosphorus (DIP) under three modes: monoculture of three sizes of oysters (Crassostrea gigas) (OA group), monoculture of kelp (Saccharina latissima) (KA group), and polyculture of oysters and kelp (KO group) at fixed wet weight ratio of 800: 200 g. The results revealed the OA group functioned as a CO2 source in both summer and winter, with summer increase rates of DIC, DIN, and DIP by oysters much higher than in winter and decreasing with larger oyster size. Pearson correlation analysis indicated a negative correlation between soft tissue dry weight of oysters and concentrations of NO2--N and NH4+-N. While, the KA group functioned as a CO2 sink, with winter decrease rates of DIC, DIN, and DIP by kelp being 14.24, 3.16, and 5.54 times greater than in summer, respectively. In the KO groups, oyster size and seasonal factors significantly affected water parameters, including pH, dissolved oxygen (DO), pCO(2), and various DIC, DIN, and DIP components (P < 0.05) and the system released DIC, DIN, and DIP in summer while absorbing them in winter. Subtraction calculations indicated that the culturing water in KO groups absorbed CO2, DIC, DIN, and DIP during both seasons, suggesting a synergistic bioremediation effect between phytoplankton and macroalgae at an appropriate cultivation ratio.

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