Fluxes of Nitrogen and Phosphorus at Sediment-Water Interface in Different Marine Polyculture Ponds
CHEN Zhong
Key Laboratory of Marine Biological Resources and Ecology, Liaoning Province, Key Laboratory of Protection and Utilization of Aquatic Germplasm Resource, Ministry of Agriculture and Rural Affairs, Liaoning Ocean and Fisheries Science Research Institute, Dalian 116023, China
Abstract：In order to obtain basic information for the management of ecological health cultivation and environmental control of sediment-water quality in marine polyculture ponds, the concentrations of NO-2, NO-3, NH+4 and DIP at sediment-water surface in three different culture patterns including (1#) jellyfish Rhopilema esculentum+ Pacific white shrimp Litopenaeus vannamei+ razor calm Sinonovacula constricta, (2#) R. culentum+ L. vannamei+ Manila clam Ruditapes philippinarum, and (3#) R. culentum+ L. vannameiwere detected during the whole culture period from June to October, and the influxes of NO-X-N, NH+4-N and DIP were analyzed. The results showed that the NO-X-N mainly diffused from overlying water to sediment in the three polyculture ponds during whole aquaculture, except the pond 3# in the Oct. The NH+4-N mainly diffused from overlying water to sediment in ponds 1# and 2#, except the pond 2# in June. Compared to ponds1# and 2#, the influxes of NH+4-N at sediment-water surface greatly changed in the pond 3#, the NH+4-N diffused from overlying water to sediment in June and July, the NH+4-N released from sediment to overlying water in September and October. The DIP-P released from sediment to overlying water in the pond 2# during the whole aquaculture, and also in the pond 1# in the June, July and October, but reverse in August and September. The DIP-P diffused from overlying water to sediment in pond 3# from June to September but reverse in October. The findings indicate that the fluxes of nitrogen and phosphorus were affected by the bivalve clam in polyculture ponds, and meanwhile the benthic and water environment were improved.
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2024, Vol. 43 
