铜绿微囊藻增殖与产毒过程中的氮磷限制与主控因子研究
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水污染控制与治理科技重大专项(2012ZX07313-001-002);陕西省青年科技新星项目(2013KJXX-55)


Nitrogen and phosphorus restriction and main controlling factors in proliferation and toxicity production of Microcystis aeruginosa
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    摘要:

    通过正交试验,研究了PO43--P分别与NO3--N和NH4+-N两种无机氮形态共存条件下对铜绿微囊藻增殖和产毒素的影响。结果表明:在PO3-4-P和NO-3-N共存环境下,当ρ(PO43--P)≤0.10 mg/L时,藻类生长受到限制,ρ(NO3--N)升高对藻细胞生长的促进作用不显著;在磷营养适宜后,ρ(NO3--N)≤5.0 mg/L能有效控制藻类过度增长。在PO43--P和NH+4-N共存环境下,只有当ρ(PO43--P)≤0.05 mg/L时,NH+4-N对藻细胞生长的促进作用才能得到限制;在磷营养适宜后,ρ(NH4+-N)≤1.0 mg/L才能有效控制藻类过度增长。MC-LR是铜绿微囊藻产生的主要藻毒素。NO3--N培养条件下,ρ(NO-3-N)≥10.0 mg/L时,ρ(PO43--P)对产毒量具有显著促进的影响;ρ(NO-3-N)<10.0 mg/L时,ρ(PO43--P)的影响不明显。NH4+-N培养条件下,所有ρ(PO43--P)下的产毒量均在ρ(NH4+-N)=10.0 mg/L达到最大值。NH<4sup>+-N是富营养化防治过程中需要优先控制的氮形态,过高的ρ(NO3--N)(≥10.0 mg/L)和ρ(NH4+-N)(≥5.0 mg/L)会大幅激发藻毒素的合成。

    Abstract:

    The effects of PO3-4-P coexisting with NO-3-N and NH+4-N on the proliferation and toxin production of Microcystis aeruginosa were studied by orthogonal experiments. The results showed that under the coexistence of PO3-4-P and NO-3-N, when ρ(PO3-4-P)≤ 0. 10 mg/L, the growth of algae was restricted, and the growth of algae was not promoted significantly by the increase of ρ(NO-3-N ). When the phosphorus nutrition was suitable, the excessive growth of algae could be effectively controlled when ρ(NO-3-N )≤ 5. 0 mg/L. Under the coexistence of PO3-4-P and NH+4-N, only when ρ(PO3-4-P)≤0. 05 mg/L could the promotion of NH+4-N on algal cell growth be limited. When the phosphorus nutrition was suitable, the excessive growth of algae could be effectively controlled only when ρ(NH+4-N)≤1. 0 mg/L. MC-LR is the main algal toxin produced by Microcystis aeruginosa. Under the cultivating condition of NO-3-N, when ρ(NO-3-N )> 10. 0 mg/L, the effect of ρ(PO3-4-P)on the toxicity was significantly promoted, the greater the toxicity was. When ρ(NO-3-N )<10. 0 mg/L, the effect of PO3-4-P was not obvious. Under the cultivating condition of NH+4-N, the toxicity of all concentrations of PO3-4-P reached the maximum at ρ(NH+4-N)= 10. 0 mg/L. NH+4-N is a priority nitrogen form in the process of eutrophication control. Excessive ρ(NO-3-N )(>10. 0 mg/L)and ρ(NH+4-N)(>5. 0 mg/L)will greatly stimulate the synthesis of algae toxins.

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任梦甜,陈荣,雷振,等.铜绿微囊藻增殖与产毒过程中的氮磷限制与主控因子研究[J].水资源保护,2019,35(5):102-107.(REN Mengtian, CHEN Rong, LEI Zhen, et al. Nitrogen and phosphorus restriction and main controlling factors in proliferation and toxicity production of Microcystis aeruginosa[J]. Water Resources Protection,2019,35(5):102-107.(in Chinese))

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  • 收稿日期:2018-08-29
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  • 在线发布日期: 2019-09-24
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