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Impacts of maricultural activities on characteristics of dissolved organic carbon and nutrients in a typical raft-culture area of the Yellow Sea, North China

机译:中国北方黄海典型筏养殖区海水养殖活动对溶解性有机碳和养分特性的影响

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Ailian Bay is an integrated multi-trophic aquaculture bay with approximately 60 years maricultural activities in North China. The floating raft culture of kelp and shellfish is the unique mariculture mode. In this study, the impacts of intensive mariculture activities on seasonal carbon and nutrient dynamics in Ailian Bay were systematically analysed via seasonal surveys between 2015 and 2016. The dissolved inorganic nitrogen and silicon reached the maximum concentrations during summer, which were mainly attributed to the release of shellfish metabolic by-products and their filter-feeding effects on diatoms. Dissolved organic carbon (DOC) concentrations were significantly elevated when kelps were rotting in summer and kelp seeding were occurring in winter. Meanwhile, the fluorescence intensity of humic-like chromophoric dissolved organic matter was relatively high in kelp mariculture zone. As most humic-like DOC are potentially refractory substances, we propose that kelp mariculture would contribute importantly to the increase of refractory DOC pool in oceans.
机译:爱莲湾是一个综合性的多养水产养殖湾,在华北地区大约有60年的海水养殖活动。海带和贝类的浮筏养殖是独特的海水养殖方式。在这项研究中,通过2015年至2016年的季节性调查,系统地分析了密集的海水养殖活动对艾莲湾季节性碳和养分动态的影响。夏季溶解的无机氮和硅达到最高浓度,这主要归因于释放贝代谢副产物的合成及其对硅藻的滤食作用。当夏季海带腐烂而冬季海带播种时,溶解的有机碳(DOC)浓度显着升高。同时,海带海水养殖区腐殖质样发色溶解有机物的荧光强度较高。由于大多数腐殖质类DOC是潜在的难治性物质,因此我们建议海带海水养殖将对增加海洋中难治性DOC库起重要作用。

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