水网藻生长及铀对其生长影响的模型构建

Model Construction of the Growth of Hydrodictyon Reticulatum and the Effect of Uranium on its Growth

研究了水网藻生长条件和生长动力学模型以及铀对其生长影响的模型。结果表明:水网藻生长条件跨度大,在模型温度2.6~38℃,pH值6~10以及光照强度2500~5000 lx范围内的最佳生长条件为温度25℃、pH值9、光照强度不低于3000 lx;水网藻生长符合生长抑制动力学模型,最大干重抑制浓度为621.427 mg/L,最大比生长速率为0.0164 g·g^(-1)·h^(-1),最小代时为42.5 h;Hormesis模型引入米氏(Mitscherlich)因子较好描绘了铀对水网藻胁迫的“低促高抑”现象,阐明了铀的胁迫效应与其对相关酶活性的调节有关。

In the study of Hydrodictyon reticulatum,the growth conditions,the growth kinetics model,and the model of the effect of uranium on its growth were examined.The results show that the growth conditions of H.reticulatum have a large span,and the optimum model temperature(2.6-38℃),pH value(6-10)and light intensity(2500-5000 lx)are 25℃,9 and no less than 3000 lx,respectively.The growth of H.reticulatum conforms to the kinetics model of growth inhibition,in which the maximum dry weight inhibition concentration is 621.427 mg/L,the maximum specific growth rate is 0.0164 g·g^(-1)·h^(-1),and the minimum generation time is 42.5 h.The introduction of Mitscherlich factor into Hormesis model can better describe the phenomenon of“low promotion and high inhibition”of uranium on H.reticulatum stress,and clarify that the stress effect of uranium is related to its regulation of related enzyme activities.