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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 .
In order to understand the important role of bacteria in the nutrient dynamics of the ecosystem in the freshwater area of the Yangtze River Estuary, The observation sea area and the large-scale water body enclosing ecosystem experimental set-up in the area of Greenhuashan Mountain.The results showed that the average bacterial productivity (C) in the sea area measured in autumn was (1.44 ± 1.30) μg / (dm3 · H), the high values appeared in the stations A3, B3 and C3 in the middle of the survey area.The surface bacteria productivity (2.43 ± 1.22) μg / (dm3 · h) in spring was higher than that in the bottom (1.10 ± 0.43) μg / (dm3 · h), and high values appeared in stations A3 and B in the middle of the survey area.The average bacterial productivity in autumn and spring was 23% of the primary productivity of phytoplankton. (52.2 × 108.0 ± 0.88 × 108) / dm3 and (1.97 × 108 ± 1.01 × 108) /dm3.1998, respectively From May 18 to June 1, the range of bacterial productivity in the natural sea area with the experimental points encircled was 0.13 ~ 5.79μg / (dm3 · h), with an average value of (2.47 ± 1. 6 0) μg / (dm3 · h). Add soluble phosphorus in the enclosure (PO3-4 ), The bacterial productivity in spring increased from 1.28 μg / (dm3 · h) to 32.2 μg / (dm3 · h), which was lower than 1.43 ~ 43.47 μg / (dm3 · h) in autumn. The bacterial productivity increased from 6.61 μg / (dm3 · h) to 37.97 μg / (dm3 · h) in oil pollution experiment, showing an increasing trend day by day.