渤海浮游植物生物量与初级生产力变化的三维模拟

Annual cycle of phytoplankton biomass and primary production in the Bohai Sea simulated by a three-dimensional ecosystem model

建立了一个与水动力模型耦合的、以浮游植物生物量、无机氯浓度、磷酸盐浓度、底碎屑含碳量为变量的三维生态模型,模拟出了与观测基本相符的渤海浮游植物量和初级生产年变化规律、水平及垂直分布的季节变化.渤海的浮游植物生物量和初级生产均呈双峰结构,夏季为高生产季节.垂直湍流混合与生物量密切相关,水体越稳定越有利于生物量的增加.模型对于磷与碳之比及无机氮半饱和常数比较敏感,需加强对敏感参数的实验测定.该模型可以用于浮游植物动力学过程的研究.

Numerical models of phytoplankton dynamics can quantify the contributions of all physical and biological processes involved in its production. It can help to improve the knowledge of the mechanism of the ecosystem variation. A three-dimensional ecosystem model, including phytoplankton biomass, phosphorous concentration, dissolved inorganic nitrogen concentration and benthic detritus density as state variables, was established to couple the physical -biological processes. The annual cycle of phytoplankton biomass and primary production of 1982 was simulated forcing by the observation and hydraulic field calculated by HAMSOM. There are two high biomass periods in 1 a, and summer is the high production season. Spring bloom starts from the Laizhou Bay and Bohai Bay while the highest biomass in summer is in the centre of the Bohai Sea due to the high stability. Vertical diffusion is very important to the distribution of biomass. The simulated spatial distributions of biomass agree with the measurements. This model is more sensitive to N/C and DIN half-saturation constant.