河鲀网箱养殖区大型底栖生物对氮、磷营养盐通量变化的响应

Response of Macrobenthos in the Balloonfish Net-cage Mariculture Area to Nitrogen,Posphor Nutrient Flux Change

[目的]探索底栖生物的生物学变化与海水沉积物-海水界面氮、磷营养盐通量变化两者之间的联系。[方法]于2008年1月、5月和7月共3次对象山港河鲀网箱养殖区海底沉积物进行了大型底栖生物采样分析,同时使用Fick第一定律对沉积物-海水界面氮、磷营养盐的扩散通量进行了估算。[结果]非养殖区总的生物丰度为666.0个/m2,明显多于养殖区(151.8个/m2)。硝酸盐扩散通量的变化对水体营养盐的整体变化具有指示作用,硝酸盐数值同底栖生物多样性指数具有显著相关性,相关系数0.762;在养殖淡季的1月和5月,磷酸盐数据与底栖生物多样性指数和均匀度指数具有明显的负相关性,其相关系数分别为-0.714和-0.857。[结论]该研究建立了底栖生物对氮、磷营养盐通量变化的响应机制。

[ Objective ] The study aimed to research the two relations between the biological changes of benthos and the nitrogen, posphor nutrient flux change in the marine sediment and water interface. [ Method] The macrobenthos of seafloor sediment was sampled and analyzed in the balloonfish net-cage mariculture area in Xiangshan harbor for 3 times in Jan. , May and Jul. of 2005. The diffusion flux of nitrogen, phosphor nutrient in marine sediment and water interface was estimated by using Fick first law. [Result] The total biological abundance in the non cultured area was 666.0 ind/m2, which was more than cultured area （ 151.8 ind/m2 ）. The change of nitrate diffusion flux had indicative function on the total change of water nutrition. The nitrate data and benthos variety index had significant relation and the correlation coefficient was O. 762. In the 1,5 month of slack season, the nitrate data and benthos variety index, evenness index had significantly negative relation and the correlation coefficient were -0.71g and -0. 857 resp. [ Conclusion ] This research established the response mechanism of benthos to nitrogen, posphor nutrient flux change.