Silicon balance in an integrated multi-tropical aquaculture ecosystem, Sanggou Bay, China

被引:1
|
作者
Li, Ruihuan [1 ]
Jiang, Zengjie [1 ,2 ]
Lin, Fan [1 ]
Zhang, Yitao [3 ]
Wang, Weixin [1 ]
Zhang, Kai [1 ]
Li, Weiwei [1 ]
Wan, Dongjie [1 ]
Shi, Yazhou [1 ]
机构
[1] Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, State Key Lab Mariculture Biobreeding & Sustainabl, Qingdao, Shandong, Peoples R China
[2] Qingdao Marine Sci & Technol Ctr, Lab Marine Fisheries Sci & Food Prod Proc, Qingdao, Shandong, Peoples R China
[3] Rongcheng Chudao Aquaculture Co Ltd, Rongcheng, Peoples R China
基金
中国国家自然科学基金;
关键词
silicon; nutrient; budget; biodeposition; aquaculture activity; Sanggou Bay; SUBMARINE GROUNDWATER DISCHARGE; SUSPENSION-FEEDING BIVALVES; CLAM MERCENARIA-MERCENARIA; KELP SACCHARINA-JAPONICA; BIOGENIC SILICA; SUSPENDED AQUACULTURE; TROPHIC AQUACULTURE; WORLD OCEAN; MULTISPECIES CULTURE; BIOGEOCHEMICAL CYCLE;
D O I
10.3389/fmars.2024.1431878
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Farmed aquaculture species play an important role in regulating nutrient cycles in farming systems. Compared with nitrogen and phosphorus, the role of farmed species in the silicon (Si) cycle remains poorly understood. To help reduce this uncertainty, we clarified the sources and sinks of silicate and quantified the Si pools in an aquaculture system in Sanggou Bay (SGB). The results showed that dissolved inorganic nutrient levels were significantly lower during the dry season than during the wet. Dissolved silicate (DSi) is a potential limiting factor for phytoplankton growth during spring, and phosphorus limitation occurs during summer. The budget results indicated that large amounts of nitrogen, phosphate (DIP), and DSi were buried in the sediment or transformed into other forms during both the wet and dry seasons. The nitrogen and DIP cycles were strongly influenced by bivalve excretion and farmed species harvesting; however, these processes had little impact on the Si cycle. Si availability depends on both external inputs and internal recycling. DSi was primarily supplied from the Yellow Sea, with a minor contribution from the river due to river discharge during spring. However, during summer, riverine inflow (accounting for 83% of the total influx) was the major DSi source followed by benthic flux (12%). Biogenic silica (BSi) burial efficiency in the sediment was estimated to be 78% during spring and 23% during summer. The BSi preservation efficiency in bivalves during spring was high (53%), leading to a higher Si retention than in river discharge. Bivalves biodeposition plays an important role in the Si burial process. We suggest that this high retention is essentially controlled by the biodeposition mechanism, which is directly controlled by the exotic suspension feeders. Bivalves have the potential to alter Si retention in the bay by producing large amounts of biodeposits and accelerating the silica cycle, which may lead to more carbon dioxide being absorbed by diatoms.
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页数:21
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