热带级联效应对阿尔卑斯山原土壤碳封存的隐藏作用
Xinchang Kou1, Ziwei Wang1, Yan Tao1
1Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun, Jilin Province, China.
Global change biology
|December 26, 2025
概括
高山原的草本植物迁移加剧了土壤食物网的碳转移,导致能源消耗效率低下,土壤有机碳 (SOC) 捕获减少. 这凸显了土壤食物网在气候变化下的碳储存调节中的关键作用.
科学领域:
- 生态生态学 生态生态学
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
背景情况:
- 阿尔卑斯山原土壤储存了大量的土壤有机碳 (SOC),这对全球碳预算至关重要.
- 气候变暖和植被变化,以及草本植物迁移,威胁着SOC的稳定性.
- 植物变化,土壤食物网和SOC封存之间的相互作用尚未完全理解.
研究的目的:
- 调查Deyeuxia angustifolia的上升迁移如何影响土壤食物网的动态.
- 评估改变的食物网对高山原碳流和SOC捕获的影响.
- 阐明在变化的植被下,热带级流在碳储存中的作用.
主要方法:
- 一个C标记的葡萄糖追踪实验在高山原土壤中进行.
- 大量草本迁移 (HM) 和非迁移 (NM) 土壤条件之间的比较.
- 在30天内,通过不同的土壤热量级进行碳转移的分析.
主要成果:
- 强烈草本迁移的土壤表现出加强的碳流和增加的碳转移到更高的食物层.
- 捕食者13C同化在HM土壤中显著增加,表明捕食者驱动的能量消耗.
- 在HM土壤中,SOC的周转率下降了50%以上,这表明转向不太稳定的有机物和减少碳积累.
结论:
- 土壤食物网显著影响植被迁移对高山原生态系统的影响.
- 增强的热层级联流将碳流转向低效的途径,限制SOC的封存.
- 由土壤食物网介导的草本植物迁移限制了阿尔卑斯山原的净碳积累.
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