Comment on "Nutrient enrichment by high aquaculture effluent input exacerbates imbalances between methane production and oxidation in mangrove sediments" by Dai et al. (Water Research 2025, 280: 123,552)
文献类型： 外文期刊
作者： Gu, Yang-Guang 1 ;
作者机构： 1.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Guangzhou 510300, Peoples R China
2.Key Lab Fishery Ecol & Environm, Guangzhou 510300, Guangdong, Peoples R China
3.Minist Agr & Rural Affairs, Key Lab Open Sea Fishery Dev, Guangzhou 510300, Peoples R China
关键词： Mangrove sediments; Aquaculture effluent; Methane emissions; Redox conditions; Organic carbon burial; Eutrophication; Blue carbon
期刊名称：WATER RESEARCH （ 影响因子：12.4； 五年影响因子：12.9 ）
ISSN： 0043-1354
年卷期： 2025 年 287 卷
页码：
收录情况： SCI
摘要： We comment on Dai et al. (2025), who report that aquaculture-derived nutrient input increases methane (CH4) emissions and alters microbial communities in mangrove sediments, leading them to conclude that wastewater threatens the long-term carbon sink function of mangroves. While these findings are valuable, we argue that their conclusions overstate the risks to sedimentary carbon storage due to several methodological limitations in their experimental design and interpretation. Specifically, Dai et al.'s reliance on short-term CH4 flux data, without integrating sediment carbon accumulation measurements or biogeochemical controls (e.g., redox dynamics), limits the validity of their extrapolated conclusions regarding long-term carbon sink impairment. Drawing from both our own sediment core studies and broader biogeochemical principles, we argue that eutrophication-driven redox shifts can enhance, rather than impair, organic carbon and nitrogen burial under specific sedimentary conditions. We advocate for a more integrated methodological framework, including direct sediment carbon accumulation assessments and redox-sensitive proxies, when evaluating the carbon sink function of blue carbon ecosystems.
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