大亚湾拟菱形藻(Pseudon-itzschiaspp.)种群的季节变化与环境因子的关系  

Dynamics of Pseudo-nitzschia spp. and environmental factors in Daya Bay, the South China Sea

作　　者：陈菊芳[1] 徐宁[1] 王朝晖[1] 黄伟建[1] 谢隆初[1] 江天久[1] 齐雨藻[1] 

机构地区：[1]暨南大学水生态科学研究所,广州510632

出　　处：《环境科学学报》2002年第6期743-748,共6页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金重大项目 (39790 110 )

摘　　要：1997年 7月至 1998年 6月期间 ,对大亚湾海域拟菱形藻种群的季节变化及其与环境因子之间的关系进行研究 .高密度的拟菱形藻出现的温度、盐度范围分别在 2 5 0～ 30 0℃和 2 8 4 0‰～ 31 30‰ .该水域N、Si含量丰富 ,P含量偏低 ,通常情况下 ,P成为拟菱形藻生长的限制因子 ,而春季高峰期中 ,拟菱形藻的消退主要可能与N的迅速耗尽有关 .N、Si、P三种营养盐之间比值的变化亦是影响拟菱形藻生长的重要原因 ,拟菱形藻高密度出现的N∶P、Si∶P、Si∶N范围分别是 6 .2 1～ 32 98、5 9 6 7～ 119 71、3 36～ 17 89.Seasonal changes of Pseudo nitzschia spp. in Daya Bay, the South China Sea, were investigated as well as the influences of environmental factors (especially nutrients) on the population dynamics were analyzed from July 1997 to June 1998. The genus were found throughout the year, forming peaks of cell concentration in Spring and Autumn. Pseudo nitzschia spp. showed the optimal range of temperature 25 0～30 0℃ and salinity 28 40‰～31 30‰ for growth, The two factors were found to have no obvious relationship with the occurrence of density peaks of Pseudo nitzschia spp.. DIN and silicate contents were abundant in the bay and DIP became limitation factor because of its low level. Ratio changes between DIN, DIP, Si were important for the growth of the genus. The optimal ranges of N∶P, Si∶P, Si∶N were 6 21～32 98, 59 67～119 71, 3 36～17 89 respectively.

关 键 词：季节变化 拟菱形藻 大亚湾海域 种群动态 环境因子 海洋污染 赤潮 环境监测 

分 类 号：X55[环境科学与工程—环境工程] X834