春季长江口邻近外海网采浮游生物的生物量谱

对2005年春季黄海南部、东海北部近江口外海水域网采的浮游生物个体大小的粒径分布进行研究,确定各粒级大小的功能群组成,建立此季该调查水域网采浮游生物的生物量谱.样品是用小、中、大型浮游生物网(网孔径为77、160、 505μm)采集所得.三网具采集浮游生物个体大小粒径是连续的,其中浮游植物,其等效粒径(ESD)和含碳量范围分别为5～250μm、15pg～146ng;浮游动物,含碳量范围为115ng～7.5mg,ESD分别为120μm～5.8mm、200μm～2cm.所得网采浮游生物的标准生物量谱,总测区的斜率为-0.607±0.059、截距为19.45±0.46;各站位的生物量谱斜率为-0.889～-0.455、截距为12.866～16.863,两特征参数分布规律为南高北低,且具有显著的站位间差异.相关性分析表明截距和回归系数与粒级多样性有关.

Biomass size spectrum of net plankton in the adjacent area near the Yangtze River Estuary in spring

Based on data from survey carried out in spring 2005, the biomass size spectra of net plankton were explored in the adjacent sea of Yangtze River Estuary. Results revealed an approximately continuous size distribution of plankton individuals, from phytoplankton (5–250 μm cell⁻¹ in equivalent sphere diameter (ESD), 15 pg–146 ng C cell⁻¹) to zooplankton (120 μm–2 cm ESD, 115 ng–7.5 mg C ind⁻¹). The normalized spectra (carbon scale) were linear with slope ranged from –0.889 to –0.445, and intercept ranged from 12.866 to 16.863 (all stations together, slope = –0.606, intercept = 19.448), indicating strong deviations from the ideal value (slope = –1.22) of a steady pelagic ecosystem. Correlation analysis presented that intercept and regression coefficient of net plankton size spectra had significant relationship with plankton biomass size diversity.