摘要
2003年6月至2004年6月对北海近岸海域3个站位的浮游植物进行周年观测。全年共采集到浮游植物69属334种。硅藻为优势类群,共51属305种,占总种数的91.3%,其中以角毛藻属(Chaetoceros)种类最多,共出现35种。甲藻8属12种;绿藻3属8种;蓝藻5属6种;其它藻类2属3种。浮游植物总细胞数的周年均值为2.14×105cells/L,数量变动模式为双峰型,高峰分别出现在夏季和冬季。中肋骨条藻(Skeletonemacostatum)为群落总细胞数中百分比最高的种,占26.61%,是夏秋两季的季节优势种。冬季和春季海区的优势种更替快,每月均有变换。通过对环境因子与浮游植物数量间的回归分析,北海近岸海域浮游植物数量受水温变化的影响最为突出,与营养盐的相关关系因受其它环境因素的影响而有所减弱。
Surveys on the phytoplankton communities in the alongshore seawaters of Beihai were carried out continuously every month from June 2003 to June 2004. There were 334 species in 69 genera identified through the whole year of samplings. The diatom was the dominant category in the phytoplankton, and 305 species in 51 genera were recorded, occupying 91.3 % of the total species number. The Chaetoceras genus has the richest diversity, and 35 species were recorded. In other phylum, 12 species in 8 genera of Pyrrophyta, 8 specie in 3 genera of Chlorophyta, 6 species in 5 genera of Cyanophyta were identified. The whole year average density was 2.14 × 10^5 cells/L. The model of quantitative variation was the two-peak type, in which the two peaks appeared in summer and winter respectively.Skeletonema costatum was the dominant population, especially in the summer and autumn seasons, occupying 26.61% of the total cell abundance through out the year. There existed obvious negative correlations between the cell abundances of Skeletonema costatum, diversity indexes and evenness indexes. The main dominant species in winter and spring varied more rapidly. The regression analysis showed that the water temperature was the essential factor affecting the quantitative variation of the phytoplankton communities in the alongshore waters of Beihai. The correlations between the quantitative variation of phytoplankton community and the nutritive salts were of less importance due to the impacts of other environmental factors.
出处
《海洋通报》
CAS
CSCD
北大核心
2005年第5期27-32,共6页
Marine Science Bulletin
基金
广西自然科学基金资助项目(0229011)
关键词
浮游植物
中肋骨条藻
环境因子
北海近岸水域
phytoplankton
Skeletonema costatum
environmental factors
alongshore seawaters
