Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 30, Issue 49, Pages 107693-107702Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-023-29985-6
Keywords
Mariculture; Carbon sink; Macroalgae; Carbon neutrality; Sedimentation rate
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The study examined the carbon sink and sources in sediments of a macroalgae cultivation field in Sansha Bay, Southeast China. The results showed that macroalgae-derived organic carbon accounted for less than 35% of the total organic carbon. A preliminary estimate suggested that macroalgae-induced carbon sink represented only 8.2 x 10^3 tons per year, which is relatively insignificant on a national or global scale. However, considering the small cultivation area, the impact of macroalgae culture on carbon sink should still be taken into account.
Macroalgae culture-induced carbon sink in sediments has been little investigated. Here, total organic carbon (TOC), total nitrogen (TN), and delta C-13 were examined in sediments in a cultivation field of macroalgae (kelp and Gracilariopsis lemaneiformis) in Sansha Bay, Southeast China. Both proxies of C/N (TOC to TN ratio) and delta C-13 indicated a multisource of TOC. Based on a three-endmember model, macroalgae-derived TOC (TOCma) accounted for < 35% of the total TOC, averaging 16 +/- 9% (mean +/- SD). On average, terrestrial and phytoplankton-derived TOC showed much higher percentages of 24 +/- 17% and 60 +/- 20%, respectively (t-test, p < 0.02). A preliminary estimate suggested that TOCma represents a carbon sink of 8.2 x 10(3) tons per year, corresponding to about 22% of the sink associated with phytoplankton and macroalgae and 8 +/- 6% of the macroalgae carbon production in Sansha Bay. Considering its production magnitude, the macroalgae-induced carbon sink seems to be insignificant, on a national or global scale, to phytoplankton, though it should be taken into account given the small cultivation area.
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