【作者】 陈兴群； 余汉生； 李国庭； 陈其焕；

【Author】 Chen Xingqun,Yu Hansheng,Li Guoting,Chen QihuanThird Institute of Oceanography,State Oceanic Administration, Xiamen 361005South China Sea Branch, State Oceanic Administration, Guangzhou 510300

【机构】 国家海洋局第三海洋研究所； 国家海洋局南海分局；

【摘要】 分析台湾岛以东副热带环流区初级生产力和理化过程在不同季节的分布和变化发现,春季叶绿素a平均总量最高,达37.19 mg/m2,秋季的最低,为24.94 mg/m2,次表层最大值成为调查海域水体叶绿素a分布的一个明显特点,变化范围介于50-150m,峰值区位于75-100 m,数值介于0.1-0.4 mg/m3.平面分布趋向表明,台湾岛以东黑潮流区各季叶绿素a总量分布均高于黑潮流区以东的环流区.100 m深度为表层寡营养盐,尤其为寡硝酸盐与下层营养盐跃层的分界线,其上50 m为温、盐跃层,也即次表层叶绿素a最大值出现的位置.温跃层的强弱调节营养盐的分布,与季节变化有关,寡营养是导致调查区表层终年现存生物量低的主要因素,而秋季表层相对于其他季节所呈现的强温跃层、低硝酸盐和高水温是导致该季生物量最低的原因.更多还原

【Abstract】 The seasonal distribution and variation of chlorophyll a biomass,size structure of chlorophyll a and physical-chemical factors are investigated in subtropical circulation system in east of Taiwan Island(18°30’ - 25°50’ N, 120°45’-129°00’ E). The results show that low nutrients, especially low nitrate is main factor resulted in low biomass in the surface layer, 100 m depth is the boundary between the upper layer with low nutrients and the lower layer with rich nutrient. The variations of temperature and sanility in depth of 50-100 m formed a mixed layer(thermocline) with the maximum chlorophyll a occurring. The low nitrate and high temperature in autumn instead of other seasons are main reasons resulted in low biomass , they may change size structure of chlorophyll a in autumn being different from other seasons.更多还原