海洋酸化对突出的N2固定菌的复杂影响
Haizheng Hong1, Rong Shen1, Futing Zhang1
1State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, Fujian, P.R. China.
Science (New York, N.Y.)
|April 29, 2017
概括
海洋酸化对固植物的生长和活动产生负面影响. 这项研究表明,降低pH值和铁限制会放大对Trichodesmium青菌的有害影响.
科学领域:
- 海洋生物学
- 海洋学
- 生物地质化学
背景情况:
- 人为二氧化碳 (CO2) 排放导致海洋酸化,影响海洋生态系统.
- 在热带和亚热带海洋中,固定的植物浮游生物至关重要.
- 菌是关键的N2固定剂,对环境变化很敏感.
研究的目的:
- 研究海洋酸化对二氧化的生长和固定的影响.
- 了解这些反应背后的生理机制.
- 评估酸化和铁限制的综合影响.
主要方法:
- 实验室实验使暴露在不同的二氧化碳度和pH值中.
- 测量生长速度,N2固定率和细胞 pH.
- 对酶度和细胞能量产生 (ATP) 的分析.
- 在铁限制条件下的模拟.
主要成果:
- 海洋酸化显著降低了三甲的生长和N2固定率.
- 在酸性条件下观察到低细胞溶液pH值,尽管CO2的升高可能是有益的.
- 需要增加质子和腺三酸盐 (ATP) 生产以维持细胞pH值.
- 铁的限制加剧了酸化对N2固定的负面影响.
结论:
- 海洋酸化对固定N2的植物构成重大威胁,特别是.
- 在酸性化下维持细胞溶液pH的生理压力是耗费能源的.
- 铁的可用性对三的抗酸化能力至关重要,其局限性增加了负面影响.
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