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微生物生长率是土壤有机碳的更强的预测因素,而不是碳使用效率

Xianjin He¹, Gaëlle Marmasse¹, Junxi Hu²

¹Laboratoire des Sciences du Climat et de l'Environnement, IPSL-LSCE, CEA/CNRS/UVSQ/Université Paris Saclay, Orme des Merisiers, Gif sur Yvette, France.

Nature ecology & evolution

|February 6, 2026

概括

微生物生长率,而不是碳利用效率 (CUE),更好地预测土壤有机碳 (SOC) 积累. 了解微生物动力学是准确的土壤碳预测的关键.

科学领域:

土壤科学土壤科学
微生物生态学微生物生态学
生物地质化学生物地质化学

背景情况:

土壤有机碳 (SOC) 动态对于气候调节至关重要,但微生物控制仍然不清楚.
碳利用效率 (CUE) 是微生物碳循环的代理,但其与SOC积累的直接联系仍在争论中.
微生物生长率通过量化生物质和死体质量生产,为SOC提供了潜在的更强的机械联系.

研究的目的:

调查微生物生长率或CUE是否是更好地预测土壤有机碳 (SOC).
将经验数据与土地表面模型输出对SOC的微生物控制进行比较.
评估非生物因素与微生物参数对SOC动态的影响.

主要方法:

结合了全球18O-H2O数据集 (268个配对观测) 与四个陆地表面模型的输出.
在化实验中分析了微生物生长率,CUE和SOC之间的关系.
基于微生物参数和非生物因素预测SOC的评估模型性能.

主要成果:

在实验数据中,微生物生长率与SOC的关联比CUE更强.
土壤特性和气候解释了SOC的显著差异,通常超过微生物参数.
模型重现了增长率比CUE更强大的作用,但低估了SOC上的非生物控制.
在预测SOC与净初级生产比率方面,模型与观察有所不同,突出了关于碳保留的不同看法.

结论:

微生物生长速度是SOC比CUE更有效的诊断,弥合经验数据和模型.
生物因素 (土壤特性,气候) 在SOC动态中发挥着重要作用,但模型可能低估了这一点.
准确的SOC预测需要微生物过程和矿物相互作用的平衡表现.

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