米氏凯伦藻生长对磷的响应及其吸收动力学研究

发布时间：2018-02-11 09:11

本文关键词： 米氏凯伦藻无机磷生长吸收动力学　出处：《上海海洋大学学报》2017年04期 　论文类型：期刊论文

【摘要】：研究了3种不同无机磷水平培养条件下对米氏凯伦藻(Karenia mikimotoi)细胞密度、体积的影响以及米氏凯伦藻的磷吸收动力学行为。结果表明:不同无机磷水平培养条件对米氏凯伦藻的生长有显著影响。在整个实验期间,磷浓度越高,米氏凯伦藻细胞密度越高,而且从第12天开始到实验结束,高磷组中米氏凯伦藻细胞密度均显著高于中磷组和低磷组(P0.05);与之相反,低磷组中米氏凯伦藻细胞体积从第6天开始显著大于中磷和高磷组(P0.05),而中磷组中米氏凯伦藻体积与高磷组差异不显著(P0.05)。利用米氏方程可较好地拟合米氏凯伦藻对无机磷的吸收速率和初始磷浓度之间关系,其中米氏凯伦藻对无机磷的最大吸收速率(ρ_(max))为18.587 fmol/(cell·h),半饱和常数(K_s)为0.490μmol/L。鉴于东海赤潮高发区的海水中无机磷含量偏低的事实(0.10μmol/L左右),米氏凯伦藻对无机磷的较强亲和力以及低磷条件下的持续增长潜力表明在低磷条件下甲藻对营养盐的吸收比硅藻更具有竞争力,从而驱动东海区硅藻赤潮和甲藻赤潮演替。
[Abstract]:The cell density of Karenia mikimotoi in three different levels of inorganic phosphorus was studied. The results showed that the different inorganic phosphorus levels had a significant effect on the growth of Karen's algae. The higher the phosphorus concentration was during the whole experiment, the higher the phosphorus concentration was. The higher the cell density of Karen Mirolimus was, and from the 12th day to the end of the experiment, the density of the cells in the high phosphorus group was significantly higher than that in the medium phosphorus group and the low phosphorus group (P 0.05), and in contrast, the cell density of the medium phosphorus group was significantly higher than that of the medium phosphorus group and the low phosphorus group. From the 6th day, the cell volume of Karen's algae in the low phosphorus group was significantly larger than that in the medium phosphorus and high phosphorus groups (P 0.05), but there was no significant difference between the medium phosphorus group and the high phosphorus group (P 0.05). The relationship between the absorption rate of inorganic phosphorus and the initial phosphorus concentration, The maximum absorption rate of inorganic phosphorus of Karen's algae is 18.587 fmol/(cell 路hmh and the semi-saturation constant is 0.490 渭 mol / L. In view of the fact that the content of inorganic phosphorus in seawater in the high red tide area of the East China Sea is low, it is about 0.10 渭 mol/L. And the potential for continuous growth under low phosphorus conditions showed that the uptake of nutrients by Prorocentrum was more competitive than that of diatoms. Thus driving the succession of diatom red tide and Prorocentrum red tide in the East China Sea.
【作者单位】：温州大学浙江省水环境与海洋生物资源保护重点实验室;中国水产科学研究院东海水产研究所农业部东海与远洋渔业资源开发利用重点实验室;
【基金】：中央级公益性科研院所基本科研业务费专项资金项目(2015M06) 国家自然科学基金青年项目(41506194) 浙江省水环境与海洋生物资源保护重点实验室开放基金(KF201502) 浙江省自然科学基金(LY14C030006) 浙江省科技厅公益项目(2015C33246)
【分类号】：X55

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