Green Tides Significantly Alter the Molecular Composition and Properties of Coastal DOC and Perform Dissolved Carbon Sequestration

Hongmei Li; Xiuting Feng; Tianqi Xiong

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Green Tides Significantly Alter the Molecular Composition and Properties of Coastal DOC and Perform Dissolved Carbon Sequestration

机译：Green Tides Significantly Alter the Molecular Composition and Properties of Coastal DOC and Perform Dissolved Carbon Sequestration

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Despite green tides (or macroalgal blooms) having multiple negative effects, it is thought that they have a positive effect on carbon sequestration, although this aspect is rarely studied. Here, during the world's largest green tide (caused by Ulva prolifera) in the Yellow Sea, the concentration of dissolved organic carbon (DOC) increased by 20—37% in intensive macroalgal areas, and thousands of new molecular formulas rich in CHNO and CHOS were introduced. The DOC molecular species derived from U. prolifera constituted ~18% of the total DOC molecular species in the seawater of bloom area, indicating the profound effect that green tides have on shaping coastal DOC. In addition, 46% of the macroalgae-derived DOC was labile DOC (LDOC), which had only a short residence time due to rapid microbial utilization. The remaining 54% was recalcitrant DOC (RDOC) rich in humic-like substances, polycyclic aromatics, and highly aromatic compounds that resisted microbial degradation and therefore have the potential to play a role in long-term carbon sequestration. Notably, source analysis showed that in addition to the microbial carbon pump, macroalgae are also an important source of RDOC. The number of RDOC molecular species contributed by macroalgae even exceed (77 vs 23%) that contributed by microorganisms.

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《Environmental Science & Technology: ES&T》 |2023年第1期|770-779|共10页
作者
Hongmei Li; Xiuting Feng; Tianqi Xiong;
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作者单位

CAS Key Laboratory of Biojuels, Shandong Provincial Key Laboratory of Energy Genetics, QJngdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, QJngdao 266101, China;

CAS Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Energy Genetics, QJngdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, QJngdao 266101, China;

CAS Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Energy Genetics, QJngdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, QJngdao 266101, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
green tides; Ulva prolifera; dissolved organic carbon (DOC); recalcitrant DOC; microbial degradation;

Green Tides Significantly Alter the Molecular Composition and Properties of Coastal DOC and Perform Dissolved Carbon Sequestration

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