Simulation on Seasonal Variation of the Phytoplankton Biomass in the Bohai Sea
Simulation on Seasonal Variation of the Phytoplankton Biomass in the Bohai Sea
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发表时间：
2014
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通讯作者：
Liu Fei
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作者：
Liu Fei
针对近岸浅水生态系统浮游植物生物量季节变化缺乏完整的机制解释的问题，采用氮基箱生态模型，对渤海浮游植物生物量季节变化的影响机制进行了研究。营养盐（N）、浮游植物（P）、浮游动物（Z）和碎屑（D）。浮游植物生物量的模拟季节格局与观测结果基本一致，对模型中的生物学参数进行了定量和定性的敏感性分析，结果表明：浮游植物最大生长速率，浮游植物的最大比死亡率和营养盐半饱和常数。根据化学条件，研究了渤海主要理化因子对浮游植物变化的影响，结果表明，渤海浮游植物的变化是理化因子综合作用的结果，太阳辐射、透明度、温度和营养盐控制了浮游植物生物量的季节循环，实际水温是夏季水华的触发因素之一，并对春季水华产生影响，光照条件是控制春花期发生的最重要限制因子，而对夏花期影响不大，营养元素是春花期发生的限制因子外部输入对夏季水华的发生和强度起着相当关键的作用。
Seasonal variation of phytoplankton biomass in shallow coastal ecosystems is lack of a complete mechanistic explanation usually.In order to explore the mechanisms that may influence the seasonal variation of phytoplankton biomass in the Bohai Sea,we adopted a nitrogen-based box ecological model,which consisted of four compartments:Nutrient(N),Phytoplankton(P),Zooplankton(Z)and Detritus(D).The simulated seasonal pattern of phytoplankton biomass was in reasonable agreement with the observation,with a stronger spring bloom and a weaker summer bloom.Quantitative and qualitative sensitivity analyses of the biological parameters were conducted,and it was indicated that the model was most sensitive to the three parameters:phytoplankton maximum growth rate,phytoplankton maximum specific mortality rate and nutrient half-saturation constant.Numerical experiments forced by different physical/chemical conditions were followed to investigate the effects of main physical/chemical factors on the phytoplankton variation in the Bohai Sea.The conclusions showed that it was the comprehensive function of the physical/chemical factors,e.g.,solar radiation,transparency,temperature and nutrient that controlled the seasonal cycle of the phytoplankton biomass.The realistic water temperature was one of the triggers of the summer bloom and had influence on the spring bloom,despite that it was not the trigger of the spring bloom.Light condition was the most important limiting factor that controlled the onset of the spring bloom while had little influence on the summer bloom.Nutrient was a limiting factor for the summer bloom,the external input of which played a rather crucial role in determining both the occurrence and the strength of the summer bloom.