渤海近岸叶绿素和初级生产力研究

Study on chlorophyll and primary production in inshore waters of the Bohai Sea

1998年 5、8和 10月分别对渤海近岸水域进行了综合调查 ,调查的内容包括海洋生物资源、浮游生物、叶绿素以及水文化学要素。作者在对 3个航次调查中叶绿素资料分析、整理的基础上报道了渤海近岸水域表层叶绿素 a和初级生产力的分布特征及季节变化。渤海近岸水域表层叶绿素 a的含量为 0 .5 4～ 16 .78mg/ m3 ,平均值为 2 .88mg/ m3 ,且季节变化明显。 5、 8和 10月 3个航次叶绿素的含量依次降低 ,其平均值分别为 3.4 7mg/ m3 (1.30～ 16 .78mg/ m3 ) ,3.0 1mg/ m3 (0 .5 8～ 15 .36mg/ m3 )和 2 .15 mg/ m3 (0 .5 4～ 14 .0 9mg/ m3 )。初级生产力采用叶绿素法测定。计算结果显示 ,渤海近岸水域初级生产力的平均值具有明显的季节变化 ,夏季 (8月 )初级生产力最高 ,平均为 4 2 0mg C/ m2 · d (32～ 180 9mg C/ m2 · d) ,春季 (5月 )次之 ,平均值为 319mg C/ m2 · d(6 8～ 12 6 7mg C/ m2 · d) ,再次为秋季 (10月 ) ,平均值只有 189mg C/ m2 · d(17～ 10 5 1mg C/ m2 · d)。整个调查水域 3个航次初级生产力的平均值为 32 7mg C/ m2·d(17～ 180 9mg C/ m2·d)。

Three comprehensive surveys were carried out in inshore waters of the Bohai Sea in May, Aug. and Oct., 1998, respectively. The distributions and seasonal variations of chlorophyll a(Chl a) and primary production based on the survey data were reported. In the inshore waters of the Bohai Sea, the average concentration of Chl a was 2 88 mg/m 3 (0 54~16 78 mg/m 3), and an obvious seasonal variation was found. The highest concentration appeared in Spring (May), average 3 47 mg/m 3 (1 30~16 78 mg/m 3 ). Second in Summer (Aug.), average 3 01 mg/m 3 (0 58~15 36 mg/m 3 ). Third in Autumn (Oct.), average 2 15 mg/m 3 (0 54~14 09 mg/m 3 ). Primary production was estimated from the Chl a data. The calculated results indicated a clear seasonal variation in primary production in the inshore waters of the Bohai Sea. The primary production in May, Aug. and Oct. were 319 mgC/m 2·d(68～1 267 mgC/m 2·d), 420 mgC/m 2·d(32～1 809 mgC/m 2·d) and 189 mgC/m 2·d(17～1 051 mgC/m 2·d ),respectively.