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Effects of mussel-kelp ratios in integrated mariculture on the carbon dioxide system in Sanggou Bay
Journal of Sea Research ( IF 2 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.seares.2020.101983
Wenwen Jiang , Jinghui Fang

Abstract The ocean is the largest carbon reservoir on Earth. The shellfish-seaweed mode of Integrated Multi-trophic Aquaculture (IMTA) can be optimized to enhance carbon removal from the sea. In this study, the effects of different mussel-kelp ratios (i.e. 6:3, 6:2, 6:1, 4:3, 4:2, 4:1, 2:3, 2:2, and 2:1) on water quality and the carbon dioxide (CO2) system were 6:3, 6:2, 6:1, 4:3, 4:2, 4:1, 2:3, 2:2, and 2:1, were investigated using experimental enclosures in Sanggou Bay, China. The results showed that the DO decreased significantly when ratios were 4:1, 6:2 and 6:1. With the exception of ratio 4:3, there was no significant change in pH in any treatment. The highest of DO, pH, and CO32− values occurred when the mussel-kelp ratio was 2:3, the highest proportion of kelp, while the lowest occurred in ratio 6:1, with the highest proportion of mussels. The highest levels of pCO2, CO2 and HCO3− were observed in ratio 6:1, and the lowest when the ratio was 2:3. Both DIC and HCO3− significantly decreased by the end of the experiment for ratios 2:1 and 6:3, while the concentration of CO2 significantly decreased for ratios 2:3 and 6:3. Considering the measured parameters, the mussel-kelp ratios of 2:1, 2:2, 4:2 and 4:3 were identified as the best net carbon sinks with the smallest negative environmental impacts. This study revealed how the IMTA shellfish-seaweed modes can be optimized to mitigate ocean acidification using specific proportions of species.
更新日期:2021-01-01
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