夏季黄、东海初级生产力的分布及其变化

Distribution of Primary Production in the Yellow Sea and the East China Sea in Summer

利用14 C示踪法实测了黄、东海海域2006年6—8月的初级生产力,结果表明,积分初级生产力介于378.65～6 403.47mg/(m2.d)之间,平均为2 059.56mg/(m2.d)。初级生产力的空间变化表现出3个特点:1)东海的积分初级生产力明显高于黄海;2)受黑潮水影响,海域的初级生产力比陆架区明显低;3)长江口东南海域和济州岛西南海域存在较高的初级生产力。对初级生产力和环境因子的关系进行分析表明,初级生产力的高值大多出现在水温为21～26℃的水体中,光强和营养盐共同调控着黄、东海海域初级生产力的分布。受黑潮水影响,海域初级生产力较低与其贫乏的营养盐有关,而长江冲淡水和冷涡输送的丰富营养盐维持着长江口东南海域和济州岛西南海域较高的初级生产力。

Primary production supports substantial biomass and higher trophic level organisms in the coastal waters, but the mechanisms regulating primary production in coastal waters are still difficult to assess. In this study, primary production in the Yellow Sea and the East China Sea was measured via 14C tracer in summer 2006 to reveal their distribution fea- tures and the impact factors. Our results showed that the depth-integrated primary production ranged from 378.65 to 6 403.47 mg/（m2· d） with an average of 2 059.56 mg/（m2· d）. The distribution of primary production indicated that （1） primary production in the East China Sea was higher than those in the Yellow Sea（2） primary production in sea areas influenced by the Kuroshio waters was significantly lower than those in the shelf regions and （3） high primary production was observed in the southeastern region of Changjiang estuary and the southwestern region of Jelu Island. The relationship between primary production and environmental factors suggested that high primary production mostly occurred in seawaters with temperature of 21-26℃ and the primary production was regulated by the availability of nutrients and lights. The low primary production in the regions influenced by the Kuroshio waters was ascribed to the low nutrients, and the high primary production in the southeastern region of Changjiang estuary and the southwestern region of Jelu Island was ascribed to the abundant nutrients supplied by the Changjiang river and the cold eddy.