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在氧气条件下,高水静压刺激了微生物酸盐在状沟沉积物中的减少

Na Yang¹, Yongxin Lv¹, Mukan Ji²

¹School of Oceanography; Shanghai Key Laboratory of Polar Life and Environment Sciences; MOE Key Laboratory of Polar Ecosystem and Climate Change, Shanghai Jiao Tong University, Shanghai, China.

Nature communications

|March 20, 2024

概括

哈德沟中的高水静压增强了脱,这是一个关键的损失途径. 这项研究揭示了深海沟作为显著的气损失热点,挑战了关于元素循环的先前假设.

科学领域:

海洋生物学海洋生物学
地质化学地质化学
微生物生态学微生物生态学

背景情况:

哈达尔沟 (>6000m) 经历极端的水静压影响生物地化学循环.
人们怀疑沟中的气损失,但机制,特别是压力的作用,仍在争论中.

研究的目的:

研究马里亚纳海沟沉积物化学,微生物结构和功能的水静压效应 (0.1-115MPa).
澄清压力介导的气损失途径在气环境中.

主要方法:

使用深海实验模拟器控制酸盐和氧气水平.
分析了沉积物的化学概况和微生物社区结构.
在in-situRNA固定沉积物上使用过元转录组学.

主要成果:

在高水静压和氧条件下观察到增强的脱活性.
没有检测到以前被认为是主导的无氧氨氧化.
证实了酸盐减少和有氧呼吸的同时发生.

结论:

液压压力显著影响微生物气循环在 hadal沟.
哈达尔战被确定为气损失的潜在热点.
了解压力对这些过程的影响对于深海元素循环知识至关重要.

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