盐度对三角褐指藻生长及有机质积累的影响

以三角褐指藻为材料，探究盐度对该藻生长、总脂等有机质含量的影响，探讨有利于油脂生产的盐度条件。结果显示，盐度变化对三角褐指藻生物量和有机质积累均有显著影响。在盐度70‰的海水中培养的细胞，其比生长速率比正常海水盐度（35‰）培养组降低了22.6%。正常海水盐度下，生物量及总脂含量最高，分别达1.92g/L和29.98%，且总脂单位体积产量极显著（p＜0.01）地高于其他各组，藻油产量高达47.67mg•L-1•d-1。在盐度17‰时，多糖含量最高，达5.5%。在盐度70‰时，蛋白质含量最高，达17.82%。  

Effect of salinity on Phaeodactylum tricornutum growth and organics accumulation

Effects of salinity on the growth of Phaeodactylum tricornutum and content of organics in P. tricornutum cells were investigated. The culture condition of high yield of algal oil was also optimized. Results showed clear effects of salinities on biomass and accumulation of organics. The algal growth rate under 70‰ (?) salinity was 22.6% lower than that of normal salinity (35‰). The highest biomass (dry weight 1.92g/L) and total lipid (29.98%) were produced under normal sea water cultures. The highest volumetric productivity of total lipid under 35‰ salinity was significantly different, with the algal oil productivity of 47.67mg per litre each day. Polysaccharides content of dry weight reached up to 5.5% under 17‰ salinity, and protein reached up to 17.82% under 70‰ salinity.