不同营养盐浓度下微绿球藻的生长及水体中氮磷的变化

The growth of Nannochloropsis oculata cultured in different nutrient concentrations and the variations of nitrogen and phosphorus in culture tanks

在单胞藻培养池中 ,以f/ 2为基本培养配方 (其主要成分为NaNO3 74.8mg ,NaH2 PO4 4.4mg ,FeC6H5O7·5H2 O 3.9mg) ,在经消毒的天然河口水中 ,分别添加 1倍、2倍、3倍浓度f/ 2配方的营养盐培养微绿球藻。结果表明 ,添加 2倍营养盐浓度组 ,微绿球藻的生长最快 ,其相对生长常数显著大于添加 1倍营养盐浓度组。在培养过程中 ,水体中NO-3 N、NH+ 4 N、总氮及PO3 -4 P含量下降 ,而NO-2 N含量在培养过程中先降后升。在高浓度营养盐条件下 ,生产单位产量的微绿球藻需要消耗更多的氮肥。

The microalgae, Nannochloropsis oculata was cultured in tanks fertilized with 1, 2, 3 times of f/2 formulated nutrient respectively. Main components of f/2 formulated nutrient are NaNO 3 74.8mg, NaH 2PO 4 4.4mg, FeC 6H 5O 7·5H 2O 3.9mg. The results indicated: when fertilized with 2 times of f/2 formulated nutrient, N. oculata grow fastest. During the culture period, the concentrations of NH + 4-N, NO - 3-N, total nitrogen and PO 3- 4-P decreased. But the concentration of NO - 2-N decreased first and then increased. Under the high nutrient concentration, producing the unit biomass of N.oculata needs more nitrogen.