森林土壤中的转移碳分量抵消了14C基的周转时间沿着1700米的高度梯度
Margaux Moreno-Duborgel1,2, Sia Gosheva-Oney1,3, Beatriz González-Domínguez3,4
1Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Zurich, Switzerland.
Global change biology
|July 12, 2025
概括
土壤有机碳 (SOC) 库存容易受到气候变化的影响. 较高的海拔显示,脆弱的土壤有机物成分中的碳增加,这表明尽管总体营业额稳定,但风险更大.
科学领域:
- 土壤科学 土壤科学
- 生态生态学 生态生态学
- 气候变化研究 气候变化研究
背景情况:
- 关于土壤有机碳 (SOC) 对全球变暖的脆弱性缺乏科学共识.
- 森林生态系统在土壤碳循环中发挥着至关重要的作用.
- 高度梯度为研究气候对土壤过程的影响提供了一个自然实验.
研究的目的:
- 评估海拔作为气候变化的代理,如何影响土壤有机物 (SOM) 库存,转化和营业额.
- 为了研究不同SOM分数 (有机层,有机颗粒物 (POM),矿物相关有机物 (MOM)) 沿着高度梯度的变化.
- 为了确定不同气候条件下的SOM分量的基于放射性碳 (C) 的转换时间.
主要方法:
- 在高度梯度 (2702020米) 上研究了50个瑞士森林地区.
- 在有机层和矿物土壤 (020厘米) 中分析了SOM,重点关注POM和MOM分数.
- 使用稳定同位素 (C,N) 和放射性碳 (C) 测年法来评估SOM转换和周转.
主要成果:
- 13C和15N的丰富度随着所有SOM分数的升高而增加.
- 有机层和矿物土壤POM中的碳储量与MOM相比随着海拔升高而增加.
- 有机层,自由POM和精细MOM分量的C基周转时间随着高度的增加而增加,表明处理速度较慢.
- 总SOC库存和散装矿物土壤周转时间显示,由于成分变化,没有海拔模式.
结论:
- 越来越高的海拔导致SOM处理速度减慢,在更恶劣的条件下,POM转化为MOM的转化减少.
- 尽管土壤的散装碳循环稳定,但在高海拔地区的脆弱POM分数中储存的碳比例较高表明气候变化风险增加.
- 森林SOC库存可能更容易受到气候变化的影响,因为在较高的海拔地区,由于SOM组成的改变,森林SOC库存可能更容易受到气候变化的影响.
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