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在Fe-Mn共同限制的东太平洋亚南极洲,植物浮游生物对尘埃添加的反应因来源区域而异

Neil J Wyatt^1,2, Antony Birchill², Simon Ussher²

¹School of Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton SO14 3ZH, United Kingdom.

Proceedings of the National Academy of Sciences of the United States of America

|July 3, 2023

概括

南大洋的生产力受到铁和的限制. 生物测试显示,铁 (Fe) 和 (Mn) 都是关键的微量营养素,它们的共同限制会影响植物浮游生物和二氧化碳吸收.

科学领域:

海洋生物地质化学海洋生物地质化学
海洋生产力的生产力
古气候学古气候学

背景情况:

南大洋的生产力受到光线和微量营养素的调节,影响二氧化碳的吸收.
矿物尘是铁 (Fe) 和 (Mn) 等必需微量营养素的主要来源.
虽然Fe的作用得到了充分的研究,但Mn对南洋生物地质化学的影响越来越被认可.

研究的目的:

为了研究植物浮游生物对铁和限制的反应,在太平洋东部的亚南极地区.
评估巴塔哥尼亚尘埃特征对微量营养素可用性和浮游植物生产力的影响.
了解Fe和Mn在不同气候条件下调节南洋生物地质化学中的联合作用.

主要方法:

在东太平洋亚南极区的南北截面进行了十五次生物测试实验.
在添加Fe,Mn和巴塔哥尼亚尘埃后测量了植物浮游生物的光化学效率.
分析了尘埃特性,重点关注Fe和Mn的相对溶解度.

主要成果:

广泛的铁 (Fe) 限制植物浮游生物的光化学效率被观察到横断.
在南部站点添加 (Mn) 进一步提高了光化学效率,表明Fe-Mn的共同限制.
不同的巴塔哥尼亚尘埃来源诱导了不同的植物浮游生物反应,与它们的Fe/Mn溶解率有关.

结论:

铁和的共同限制是控制南大洋植物浮游生物生产力的重要因素.
尘埃沉积的大小和来源矿物学会影响Fe或Mn的可用性限制生产力.
了解这些微量营养素的动态对于预测过去和未来南大洋对气候变化的反应至关重要.

关键词:

生物地质化学生物地质化学生态生理学生态生理学植物浮游生物植物.

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