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泥炭区的变暖影响了分支四乙烯脂质的丰富性和分布:对温度重建的影响

Nicholas O E Ofiti¹, Arnaud Huguet², Paul J Hanson³

¹Department of Geography, University of Zurich, Zurich, Switzerland; CEREEP-Ecotron Ile De France, ENS, CNRS, PSL Research University, Saint-Pierre-lès-Nemours, France.

The Science of the total environment

|March 15, 2024

概括

分支糖醇二甲基糖醇四乙烯 (brGDGTs) 是作为气候代理物使用的细菌脂质. 变暖增加了泥炭地中的brGDGTs,变化集中在表面层,表明生理适应和深度特异性反应改善了古气候重建.

科学领域:

生物地质科学生物地质科学
古气候学古气候学
微生物生态学微生物生态学

背景情况:

分支甘二甲基甘四乙醇 (brGDGTs) 是细菌膜脂质,被用作古气候代理物.
现有的基于brGDGT的温度模型具有很高的不确定性和生态系统层面的不一致性.
对brGDGT温度机制和其他因素影响的有限理解有助于不准确.

研究的目的:

调查现场变暖对北极泥炭地brGDGT丰度和分布的影响.
评估brGDGTs对变暖的深度特异反应.
为了评估土壤温度和水表深度对brGDGT代理的影响.

主要方法:

在四年内对北极泥炭地进行实验性变暖,并控制温度的增加.
在不同深度的土壤样本中分析brGDGT度和分布.
计算5-甲基brGDGTs (MBT'5Me) 的甲基化指数作为温度代理.

主要成果:

总brGDGT度随着实验变暖而增加.
brGDGT分布在表面有氧层 (0-30厘米) 转移,但在更深的无氧层 (> 40厘米) 没有转移.
MBT'5Me指数显示,随着气候变暖而大幅增加,但其与温度的关系随着深度而变化.
土壤温度和水表深度被确定为brGDGT度和分布的关键驱动因素.

结论:

变暖导致brGDGT产生的微生物的生理适应,导致脂质分布的快速变化.
brGDGTs对变暖的深度特异性反应是显著的,必须在古环境研究中考虑.
brGDGT仍然是可行的温度代理,但它们的应用需要考虑土壤温度和水表影响.

关键词:

细菌社区的细菌社区有分支的GDGTs可以使用.脂质生物标志物脂质生物标志物古气候的代理是古气候.皮特兰德是一个泥炭地.气候变暖导致的变暖

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