Study on nutrient fluxes of sediment-water interface in cage culture zone of large yellow croaker Pseudosciaena crocea in Xiangshan Bay

doi:10.3969/j.issn.1001-909X.2016.01.011

Abstract

Abstract: Undisturbed sediment samples were collected from the cage culture zone and nearby of large yellow croaker' farm in Xiangshan Bay in May, Aug. and Nov. of 2013. Total organic nitrogen (TON), total organic carbon (TOC) and total phosphorus (TP) in the sediments were determined. A simulated experiment was conducted to study the sediment oxygen consumption (SOCs) rates and nutrients(NH⁺₄、NO^-₂+NO^-₃、PO^3-₄) fluxes between water column and sediments. TON and TP values of sediment in cage-zone(YZ) are generally significantly higher than those in stations of 50 m away (F1) and 100 m away (F2) (P<0.05). The sediments release NH⁺₄ to the overlying water where as they takes up NO^-₂+NO^-₃ and PO^3-₄. Benthic fluxes show that intensive seasonal variations and the release of NH⁺₄and PO^3-₄reach peak values in August, which response to increased organic input due to the yellow croaker farming. The nutrient concentration in water changes with benthic nutrient fluxes among seasons. The results obtained in this study imply that the ongoing aquaculture activities have led to sediment organic pollution at certain extent and the polluted sediment could affect the benthic nutrient fluxes, which might cause the redistribution of nutrients in water column.

Key words: fish farming, yellow croaker, sediment, nutrient flux, Xiangshan Bay

CLC Number:

S967.3

LIAO Hong-fang, ZHENG Zhong-ming, REGAN Nicholaus, ZHU Jin-yong. Study on nutrient fluxes of sediment-water interface in cage culture zone of large yellow croaker Pseudosciaena crocea in Xiangshan Bay[J]. Journal of Marine Sciences, 2016, 34(1): 84-92.

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