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Temporal dynamics of lateral carbon export from an onshore aquaculture farm

文献类型： 外文期刊

作者： Hou, Yuxuan 1 ; Liu, Yong 2 ; Zhang, Junxiao 3 ; Yu, Xuan 1 ;

作者机构： 1.Sun Yat Sen Univ, Ctr Water Resources & Environm, Sch Civil Engn, Guangzhou 510275, Peoples R China

2.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Key Lab South China Sea Fishery Resources Exploita, Minist Agr & Rural Affairs, Guangzhou 510300, Peoples R China

3.Minist Nat Resources, Key Lab Marine Environm Survey Technol & Applicat, Guangzhou 510310, Peoples R China

4.Minist Nat Resources, South China Sea Marine Survey Ctr, Guangzhou 510310, Peoples R China

5.Southern Marine Sci & Engn Guangdong Lab, Zhuhai 519082, Peoples R China

关键词： Lateral carbon export; Aquaculture farm; Tidal fluctuation; Dissolved organic carbon; Particulate organic carbon

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2023 年 859 卷

页码：

收录情况： SCI

摘要： Many coastal areas are hotspots of aquaculture expansion, where the overuse of artificial feeds results in the accumulation of organic carbon in nearshore aquaculture ponds. In rural areas, wastewater from the aquaculture ponds is discharged to the nearshore waters through artificial ditches causing lateral carbon export from the land to the ocean. Such flux may be meaningful in coastal carbon budgets since aquaculture is the hotspot of carbon sequestration and storage. To quantify the magnitude and temporal dynamics of lateral carbon export from aquaculture ponds, we used high-frequency in-situ monitoring of turbidity, fluorescent dissolved organic matter, etc. across different temporal scales. We measured water levels and velocity profiles in a ditch cross-section to obtain year-round water exchange. Carbon export was integrated from water fluxes and organic carbon concentrations. Our results suggested that aquaculture ponds were a source of particular organic carbon (POC) and dissolved organic carbon (DOC). The net lateral flux of POC and DOC was 148 & PLUSMN; 38 kg yr-1 and 296 & PLUSMN; 18 kg yr-1. Temporally, the export of POC and DOC is influenced by both tides and wastewater discharge. Under the disturbance with aquaculture wastewater discharge, the mean DOC export in the ditch increased by 497 kg, which was 1.5 times that of the undisturbed; the mean POC export increased by 190 kg, which was 1.8 times that of the undisturbed. Thus, aquaculture activities can considerably disturb the coastal carbon balance by facilitating carbon-rich fluid exchange from onshore farms to nearshore estuaries. As

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