Selection of Microalgal Growth Model for Describing Specific Growth Rate-Light Response Using Extended Information Criterion

摘要

The effects of light intensity and carbon dioxide (CO_2) concentration on the growth of the highly CO_2-tolerant green alga Chlorococcum littorale were studied in batch cultures.Four mathematical representations were compared for the specific growth rate-light response curve:a rectangular hyperbolic function,Steele's exponential function,a Poisson function and a hyperbolic tangent function.The hyperbolic tangent function,which is commonly used for representing the photosynthesis-light relationship,gave the best fit as evaluated by the extended information criterion (EIC).EIC proved to be applicable as a criterion to this kind of nonlinear model selection problem.Carbon dioxide,the sole carbon source for photoautotrophic growth of this alga,inhibited the growth rate at concentrations higher than pCO_2 of 0.02.A substrate inhibition model was successfully used to simulate the relationship between the specific growth rate and CO_2 response.