摘要
研究了1997年6月～1998年7月及1999和2000年春季大亚湾角毛藻(Chaetocerosspp.)细胞数量变动及其与环境因子之间的关系,并进行了多因变量方差分析、多元线性逐步回归分析及主成分分析。角毛藻是大亚湾浮游植物常见优势属,优势物种主要为窄隙角毛藻(C.affinis)、柔弱角毛藻(C.debilis)、远距角毛藻(C.distans)和劳氏角毛藻(C.lorenzianus)等。1997～1998年度角毛藻细胞数量出现了明显的春季高峰,最高细胞数量和百分比含量分别达6680.6cellsml和99.78%,而且在其他季节也出现了数量不等的峰值,DIN的消耗在一定程度上导致了角毛藻水华的消退。多元分析结果表明,水温和营养元素之间的比例是影响角毛藻细胞数量变动的主要因子,此外DIN和盐度对角毛藻细胞数量变动也产生较明显的影响。
A Population changes in Chaetoceors spp. and environmental factors were investigated in Daya Bay, South China Sea, from June 1997 to July 1998 and the spring of 1999 and 2000. Relationships between abundance of Chaeto. spp. and some environment parameters were analyzed by multivariate general linear factorial analysis, linear stepwise regression analysis, and principle component analysis. Chaetoceros was the most abundant genus of phytoplankton in Daya Bay, contributing 23.25 % of the total phytoplankton ahundance. Chaetoceros reached peak abundance in the spring of 1998, with maximum cell density of 6680.6 cells/ml and 99.78% of total phytoplankton. C. affimis, C. debilis, C. distaffs and C. lorenzianus were the main bloom causative species. The nutrient levels were high just before the bloom of Chaetoceros, but dropped rapidly as the bloom developed. Results showed that depletion of nutrients especially dissolved inorganic nitrogen （DIN） led to the collapse of Chaetoceros bloom. Peak abundances of Cheatoceros occurred under a wide variety of water temperature （15℃ to 31 ℃ ） and salinity （15psu to 31psu）. Results from statistical analyses revealed that water temperature and ratios between nutrients were the key factors influencing on population dynamics of Chaetoceros, while DIN and salinity played important roles as well.
出处
《生态学报》
CAS
CSCD
北大核心
2006年第4期1096-1102,共7页
Acta Ecologica Sinica
基金
国家自然科学基金资助项目(40306020)
国家重点基础发展规划资助项目(2001CB409701)~~
关键词
角毛藻
大亚湾
环境因子
赤潮
Chaetoceros
Daya Bay
environmental factors
algal bloom
