海洋生物中碳流减弱的解码驱动因素
M Bressac1,2, E C Laurenceau-Cornec3,4, F Kennedy3
1Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, Villefranche-sur-Mer, France. matthieu.bressac@imev-mer.fr.
Nature
|September 11, 2024
概括
微生物降解占海洋有机颗粒物 (POC) 流量减弱的7-29%,这表明动物浮游生物发挥了更大的作用. 微生物重矿化率在海洋区域和深度之间有很大差异.
科学领域:
- 海洋学
- 海洋生物学
- 生物地质化学
背景情况:
- 生物将碳入深海,为生态系统提供燃料.
- 在中层层层中微粒有机碳 (POC) 流减弱的理解很少.
- 目前的模型依赖于经验"马丁曲线"进行流量减弱.
研究的目的:
- 为了研究微生物介导的POC流减弱在 mesopelagic.
- 分析马丁曲线背后的机制.
- 在不同海洋系统中比较微生物的作用.
主要方法:
- 使用C-RESPIRE仪器进行现场实验.
- 在六个海洋系统中部署在多个半层层的深度.
- 微生物介导的POC流减弱的测量.
主要成果:
- 微生物降解对POC流量减弱有7~29%的贡献.
- 微生物重矿化正常化到POC流量在不同地点变化了20倍.
- 温度梯度影响了低度的垂直趋势,而粒子特性则在其他地方占主导地位.
结论:
- 动物浮游生物可能在POC流减弱中扮演着比以前更重要的角色.
- 微生物重矿化是高度可变的,并受到多种因素的影响.
- 了解这些机制对于完善海洋碳捕获模型至关重要.
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