厦门附近海域叶绿素含量的分布及其周年变化

THE DISTRIBUTION AND ANNUAL FLUCTUATIONS OF CHLOROPHYL IN WATERS AROUND XIAMEN

一、前言海水中的叶绿素,尤其是叶绿素a,是担负着海洋中95%以上有机物质的生产者——浮游植物细胞体内的主要色素,也是它们能够利用太阳光能把无机物转化为有机物的关键色素。由于海水中叶绿素a在各类浮游植物中广泛存在,且在相同条件下,其含量与浮游植物现存生物量及光合作用能力密切相关;又由于三色分光测定叶绿素a、b、c方法的建立,叶绿素—光强度测定初级生产力技术及走航、遥感等先进技术的应用,使得叶绿素,尤其是叶绿素a含量的测定在国际上得到广泛的应用和发展,并普遍成为表示海洋浮游植物现存生物量和估算海洋初级生产力的重要方法之一。七十年代初期,国内就有人开展这项工作。厦门港的浮游藻类,金德祥等作过多次调查和研究,而有关海水中叶绿素的含量及其在该海域的分布和变化规律还未见过报导。本文首次报导了厦门附近海域表层海水中叶绿素a、b、c和总量的测定及叶绿素a/c、a/b比值的统计结果,并以叶绿素a含量平面分布的逐月变化,反映出浮游植物现存生物量的季节变化和区域性分布的盛衰过程。

An annual determination by spectrophotometry of chiorophyl a,b,and c and its total amount in the surface waters around Xiamen(Nov,1980 to Oct.1981)revealed their ranges were 1.02-27.7,ND-1.39,ND-8.21 and 1.20-37.3 mg/m^3 respectively,their mean values being 4.55,0.34,1.62 and 6.49 mg/m^3.The annual fluctuations of chlorophyl content had two periods with peaks in June to September(summer and early autumn)and January(winter).The ratio of a/c and a/b were respectively 1.1-7.7 and 2.9-37.5 and a>c>b.The monthly horizontal distribution of chlorophyl a and the seasonal flutuation of several dominated diatoms are presented.The interrelationship between the distribution end dominated daitom quantity and physichemical factors,such as continental runoff,are discussed.