光强与光质对钝顶螺旋藻生长及固碳的影响

Light intensity had a great influence on the growth and carbon fixation of Spirulina platensis. The result showed that when light intensity was lower than 3000 Lux, the specific growth rate and carbon fixation rate increased as the light intensity increased and the synthesis of chlorophyll a was promoted. The carbon fixation rate reached the peak of 42.506 mg/(Loh) when the light intensity was 3000 Lux. When light intensity was higher than 3000 Lux, the carbon fixation rate gradually reduced as the light intensity increased and the synthesis of chlorophyll a was inhibited. The lowest maximal biomass and the carbon fixation rate with the treatment of 6000 Lux were 1.270 g/L and 21.803 mg/(Loh), respectively. Light quality also had a great influence on the growth and carbon fixation of Spirulina platensis. The cell growth was markedly stimulated by the red light. The maximal biomass, growth rates, content of chlorophyll a, carbon fixation rate were 1.957 g/L, 0.541 d-1, 6.962 mg/L and 46.446 mg/(Loh), respectively. And they were higher than those under other treatments. In addition, light quality had obvious implications for the crude nutrients of Spirulina platensis. Protein synthesis was markedly stimulated by blue light, and the protein content reached 0.572 g/g(DW). Whereas carbohydrate synthesis rate increased under red light and reached 0.255 g/g(DW). Lipid content reached 0.127 g/g(DW) under white light and somewhat decreased under blue and red light conditions.