长江冲淡水区细菌生产力研究

Bacterioplankton production in dilution zone of the Changjiang ( Yangtze River) Estuary)

为了解细菌在长江口冲淡水区生态系营养动力学过程中的重要作用 ,笔者于1 997年 1 0月 1 0日至 2 0日 ,1 998年 5月 1 4日至 6月 1日在观测海区以及在绿华山海域设置大水体围隔生态系实验装置进行细菌生产力的现场观测研究 .结果表明 ,秋季观测海区平均细菌生产力 (C)为 (1 .44± 1 .30 ) μg/(dm3·h) ,高值出现在测区中部的A3,B3和C3站 .春季测区表层细菌生产力 (2 .43± 1 .2 2 ) μg/(dm3·h)高于底层(1 .0 1± 0 .43) μg/(dm3·h) ,高值出现在测区中部的A3和B断面诸站 .秋、春季平均细菌生产力相当于浮游植物初级生产力的 2 3% .秋季和春季表层细菌数量分别为(5 .2 2× 1 0 8± 0 .88× 1 0 8)个 /dm3和 (1 .97× 1 0 8± 1 .1 0× 1 0 8)个 /dm3.1 998年 5月1 8日至 6月 1日在围隔实验点的自然海区中细菌生产力变幅范围为 0 .1 3～ 5 .79μg/(dm3·h) ,平均值为 (2 .47± 1 .6 0 ) μg/(dm3·h) .围隔装置内加可溶性磷 (PO3-4 )实验 ,春季细菌生产力由 1 .2 8μg/(dm3·h)增长至 32 .2 0 μg/(dm3·h) ,其增长幅度低于秋季 1 .43～ 43.47μg/(dm3·h) .油污染实验中细菌生产力由 6 .6 1 μg/(dm3·h)增长至 37.97μg/(dm3·h) ,呈逐日上升趋势 .

The bacterioplankton production and bacterioplankton abundance were surveyed in dilution zone of the Changjiang Estuary and a mesocosm experimental device for enriched phosphate experiment and oil contaminated experiment was placed in the waters nearby Luhua Island during October 1997 and May 1998. The results show that the average bacterioplankton production in spring is higher than that in autumn, the production at the surface water is higher than that at the bottom in the survey area; the higher values appear in the middle of the area. The results from mesocosm experiment with adding phosphate and oil contaminated show that the bacterioplankton production increases rising trend day by day during the experiment period.