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利用船基现场培养实验和模型计算的方法,通过对东海原甲藻生长的光照效应和海水中光照最适宜生长水层的分析,研究了光照在东海近海东海原甲藻赤潮孕育和发生中的作用.结果表明,东海原甲藻生长与光照的关系可用Steele方程描述,其生长的最适光照强度(Iopt)为(38.2±3.8)W.m-2,比其它几种常见赤潮藻的Iopt(40~133 W.m-2)低,适应低光照的能力使东海原甲藻在高混浊海水中形成赤潮更具优势.东海近海光照最适宜东海原甲藻生长的水层厚度,由近岸向远岸逐渐增加,在赤潮高发区一般在5~10 m,而且位于水深3~15 m的次表层水层内.赤潮在“赤潮高发区”这个特定海域发生是水体光照和营养盐权衡的结果,而次表层光照最适的特性是导致春季次表层孕育赤潮的重要因素之一.
Based on the field experiment and model calculation of ship-based field, the illumination effects on the growth of Prorocentrum donghaiense and the optimum water layer for illumination in seawater were studied. The effects of light on the occurrence and occurrence of Prorocentrum donghaiense The results showed that the relationship between the growth and the illumination of Prorocentrum donghaiense was described by Steele equation and the optimum illumination intensity (Iopt) was (38.2 ± 3.8) Wm-2, which was significantly higher than that of other common red tide algae ~ 133 Wm-2), adapting to the low light intensity makes it more advantageous for Prorocentrum donghaiense to form red tide in high-turbidity seawater.The thickness of the water layer which is most suitable for the growth of Prorocentrum donghaiense from the coastal to the distant shore Gradually increase in the high incidence area of red tide is generally 5 ~ 10 m, and located in the sub-surface water depth of 3 ~ 15 m. Red tide in the “red tide high incidence area” occurs in this particular area is the result of water and nutrient salt tradeoff , While the characteristics of subsurface illumination are the most important factors that lead to the red tide in the surface layer of spring.