夏季南大洋普里兹湾有机质耗氧及营养盐再生过程模拟研究

THE STUDY ON OXYGEN CONSUMPTION OF ORGANIC MATTER AND NUTRIENTS REGENERATION IN PRYDZ BAY,THE SOUTHERN OCEAN

在中国第22次南极科学考察期间,通过南大洋普里兹湾150m上表层水柱采集的浮游植物的现场培养实验,研究了湾内陆架区Ⅲ-11站与埃默里冰架边缘区IS-2站浮游植物颗粒物的降解过程,估算了实验条件下研究海域浮游植物碎屑耗氧速率以及营养盐的生成速率。结果表明:在实验初期DO含量变化明显,随时间呈显著下降趋势,而营养盐含量则呈上升趋势,两者在实验后期均变化缓慢。在Ⅲ-11站100h内耗氧速率为92.592mg/(m2·h),实验初期磷酸盐、铵盐以及硅酸盐的生成速率分别为:107.15,65.10,351.93μmol/(m2·h);在IS-2站50h内耗氧速率为77.927mg/(m2·h),50h后耗氧速率降为21.142mg/(m2·h),50h内磷酸盐、铵盐以及硅酸盐的生成速率分别为:43.61,137.32,60.89μmol/(m2·h)。

Based on the results of in situincubation experiment in CHINARE-22cruise（2005.11—2006.3）,the degradation process of organic compounds of Prydz Bay was investigated.According to the data of DO change and nutrient regeneration,the oxygen consumption rate of degradation process and release rate of phosphate,ammonium and silicate were estimated.The results show that the dissolved oxygen in the system decreased linearly with time in the initial stage and,however,gave a non-obvious decrease in the late stage.Contrarily the contents of nutrients increased during the initial stage.The oxygen consumption rate of Ⅲ-10was 92.592mg/m2·h in 100h,and the release rate of phosphate,ammonium and silicate were 107.15,65.10,351.93μmol/m 2 ·h,respectively.The oxygen consumption rate of IS-2was 77.927mg/ m 2 ·h in 50hs,and after 50h,the rate was reduced to 21.142mg/m2·h.The release rate of phosphate, ammonium and silicate of IS-2in the initial 50h were 43.61,137.32,60.89μmol/m 2 ·h,respectively.