气候变暖和高碳排放量改变了泥炭土的碳来源和稳定性
Nicholas O E Ofiti1,2, Michael W I Schmidt3, Samuel Abiven4,5
1Department of Geography, University of Zurich, Zurich, Switzerland. nicholas.ofiti@geo.uzh.ch.
Nature communications
|November 21, 2023
概括
气候变化影响了泥炭土的碳储存. 仅仅是变暖就会加剧分解,而变暖加上二氧化碳的增加会转移碳来源,可能会破坏这些重要生态系统的稳定.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
背景情况:
- 泥炭地储存了全球土壤有机碳 (SOC) 的很大一部分.
- 气候变化,特别是气候变暖和大气二氧化碳 (eCO2) 增加对泥炭地SOC组成和稳定性的影响仍然不太清楚.
- 了解这些变化对于预测泥炭地碳库的未来至关重要.
研究的目的:
- 为了研究变暖和eCO2如何影响北极泥炭地中的SOC分子组成.
- 在模拟的气候变化条件下推断SOC的来源 (微生物,植物,火) 和稳定性.
- 评估气候变化对泥炭地碳储存的净影响.
主要方法:
- 使用先进技术分析SOC分子组成.
- 区分植物,微生物和火源碳输入.
- 量化特定SOC化合物的变化,如suberin (源于根) 和cutin (源于叶子/针).
主要成果:
- 仅仅是变暖就增加了SOC分解,减少了微生物和植物衍生的SOC.
- 与eCO2相结合的变暖导致植物衍生的SOC化合物的增加.
- 根源导入量 (suberin) 增加,而叶子/针导入量 (cutin) 在变暖和eCO2下降.
- 这些转变表明,我们正在向具有更快的营业额率的SOC池迈进.
结论:
- 气候变化通过变暖和eCO2改变了北极泥炭地中的SOC组成和来源.
- 变暖加剧了分解,而eCO2影响了碳输入路径,特别有利于根源衍生化合物.
- 综合效应表明,泥炭地可能会破坏碳储存的稳定性,因此需要进一步研究它们在全球碳循环中的未来作用.
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