富含营养的矿物质与相关的有机物质限制了碳储存在低的低二氧化碳的低碳二氧化碳下白树林土壤林地土壤
Anna Favaro1, Yolima Carrillo2, Balwant Singh1
1School of Life and Environmental Sciences, Faculty of Science, The University of Sydney, Camperdown, New South Wales, Australia.
Global change biology
|October 29, 2025
概括
升高的二氧化碳 (eCO2) 降低了土壤有机物池,特别是矿物相关有机物 (MAOM),在低的树林中. 这表明eCO2可能通过增加富含营养的MAOM的分解来限制土壤碳储存.
科学领域:
- 土壤科学 土壤科学
- 生态系统生态学生态学
- 生物地质化学生物地质化学
背景情况:
- 大气中的二氧化碳度影响土壤有机碳 (SOC) 池和营养素的可用性.
- 营养循环对于生态系统功能至关重要,土壤营养素通常与矿物相关的有机物 (MAOM) 和有机颗粒物 (POM) 结合在一起.
- 高水平的二氧化碳 (eCO2) 对这些独特的土壤有机物池的影响仍然不清楚.
研究的目的:
- 为了研究12年的eCO2对MAOM和POM碳 (C), (N) 和 (P) 池的影响.
- 为了评估这些影响在不同的土壤深度 (0-10厘米和10-20厘米) 在一个低P欧树林.
- 了解eCO2下的SOC池的变化驱动机制,特别是在营养有限的环境中.
主要方法:
- 在树林中进行长期eCO2实验的土壤样本分析.
- 在两个土壤深度的MAOM和POM分数中量化C,N和P.
- 在eCO2条件下的营养池与环境CO2 (aCO2) 条件下的营养池比较.
主要成果:
- 在土壤深度中,eCO2显著降低了MAOM-总C (16%),MAOM-有机N (15%) 和MAOM-有机P (16%).
- 在POM池中没有观察到eCO2对C,Norg或Porg的显著影响.
- MAOM的C:Porg和C:Norg比POM更低,这表明营养度更高.
结论:
- 由于eCO2引起的地下碳输入增加,加上土壤P的低值,可能刺激了MAOM的根球原始化效应.
- 微生物挖掘富含营养的MAOM用于P和N可能会增强其分解,抵消潜在的SOC积累.
- 由于MAOM池在eCO2下易受原始化影响,可能会限制SOC在低P土壤中的储存.
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