【摘要】 采用一次培养实验方法,研究了Cr(Ⅵ)污染物对海洋浮游植物生长的影响.结果表明高浓度Cr(Ⅵ)对8种浮游植物的生长普遍有抑制作用,而较低浓度Cr(Ⅵ)则易促进旋链角毛藻、青岛大扁藻及中肋骨条藻的生长.并且在Logistic生长模型的基础上结合Lorentz方程和GaussAmp方程,引入Cr(Ⅵ)污染物浓度项,建立Cr(Ⅵ)污染物条件下海洋浮游植物生长动力学模型,来描述Cr(Ⅵ)存在条件下海洋浮游植物的生长过程,其中Lorentz方程可描述Cr(Ⅵ)浓度的变化对浮游植物生长速率参数的影响,而GaussAmp方程可描述Cr(Ⅵ)浓度的变化对浮游植物生物量的影响,实验验证了该模型的合理性,其拟合可决系数R2为0.832～0.986,平均为0.909.本文提出的生长模型可预测不同Cr(Ⅵ)浓度条件下海洋浮游植物的生长情况,对研究污染物影响浮游植物的生长具有重要的实际意义.更多还原

【Abstract】 The effects of Cr (Ⅵ) on the growth of 8 species of marine algae were investigated using batch culture experiments.The experimental results showed that while high concentrations of Cr (Ⅵ) inhibited the growth of 8 species of marine algae,a low concentration (10 μg·dm-3) of Cr (VI) promoted the growth of marine algae such as Chaetoceros curvisetus,Platymonas helgolanidica,and Skeletonema costatum (Greville) Cleve.A growth model was further developed to simulate the effect of Cr (Ⅵ) on the growth of marine algae by incorporating a logistic growth model with the Lorentz equation and the GaussAmp equation.In this model,the Lorentz equation was used to describe the effect of Cr (Ⅵ) on the growth rate constant while the GaussAmp equation describes the effect of Cr (Ⅵ) on the final biomass of algae.Results of model showed good fits to the experimental data and the correlation coefficients were from 0.832 to 0.986 with an average of about 0.909.更多还原