厦门港微型浮游生物叶绿素的分布和作用

DISTRIBUTION AND CONTRIBUTION OF NANO-AND PICOPLANKTON CHLOROPHYL IN XIAMEN HARBOUR

于1989年2月—1990年2月，运用分光光度法对厦门港各大小类群浮游生物叶绿素测定结果表明，微型浮游生物（3—20μm）是初极生产者中的最主要组成者（叶绿素a平均占74．7％）；小型（20－200μm）和极微型（＜3μm）浮游生物不是重要类群（平均占18．0和7．3％）。因此认为，在浮游植物定量研究中用采水方法采集浮游植物比用网采方法更客观。微型浮游生物生物量季节变化明显，夏季＞春季＞秋、冬季。

The chlorophyl a,b, c and phaeo-pigment of micro-(20-200μm), nano-(3-20μm) and picoplankton (＜ 3μm) in Xiamen Harbour were investigated half-monthly from February 1989 through February 1990 using spectrophotometrical technique. The seasonal and spatial distribution and contribution of chlorophyl of micro-, nano-,and picoplankton to phytoplankton were studied. Results show that Xiamen Harbour, like other coastal and estuary areas, has nanoplakton (Chl a, 2.468 and 3.405mg/m3 at 0 and 10 m depth)as its most important contributer to primary production accounting/for 33.9%-95.6% (av. 74.7% ) of total phytoplankton chlorophyl a, whereas microplankton (Ch1 a, 0.676 and 0.719mg/m3) and picoplankton (Chl a, 0.222 and 0.353 mg/m3) account for only 0.1 %-53. . % (av. 18.0% ) and 1.1%—33.7% (av. 7.3 % ) respectively. It is suggested that phytoplankton collection for quantitative studies should be by water bottle rather than by common phytoplankton net which of ten neglects the abundant nanoplankton. A significant variation for nanoplankton chlorophyl a as Summer＞ Spring ＞ Autumn and Winter is influenced mainly by runoff from the Jiu Long River.