THE ROLE OF MODIFIED CLAY IN THE REGULATION OF THE MAJOR BIOGENIC ELEMENTS IN SHRIMP AQUACULTURE PONDS
High-intensity aquaculture activities have drastically changed the distribution patterns and cycling process of the major biogenic elements,and resulted in severe eutrophication of aquaculture water and frequent incidence of harmful algal blooms,which not only limits the healthy development of aquaculture industry,but also has an adverse effect on the nearby marine ecosystem.In recent years,water quality control in aquaculture water has attracted widespread attention.We evaluated the role of modified clay on the distribution characteristics of the major biogenic elements based on field observations and comparative systematic research on the major biogenic elements in the water of Litopenaeus vannamei farming ponds in Laizhou Bay,Shandong from May to September 2023.Meanwhile,our research combined culture experiments to explore the effect of modified clay on the cycling of major biogenic elements.Results demonstrate a trend of fluctuating upward in the content of the major biogenic elements(carbon,nitrogen,and phosphorus)in the aquaculture water.Spraying modified clay could reduce the content of dissolved inorganic nitrogen(DIN)and dissolved inorganic phosphorus(DIP)in the aquaculture water for over 90％of removal in 24 h.During the aquaculture process,the average content of total organic carbon(TOC),total nitrogen(TN),and total phosphorus(TP)in the experimental pond were lower than those in the control pond.The experiments revealed that modified clay could significantly reduce the mineralization rate of TOC and the regeneration rate of DIN,DIP,promote the burial of organic carbon effectively,and delay the regeneration and release of nutrients.Therefore,modified clay can reduce organic matter and nutrient levels in aquaculture water,control effectively the water quality of aquaculture water,and promote the burial and sequestration of organic matter,showing bright prospects for marine carbon burial.
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