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解锁土壤有机物积累的机制:碳利用效率和微生物死体作为关键

Yang Yang^1,2,3, Anna Gunina^4,5, Huan Cheng⁶

¹State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China.

Global change biology

|January 17, 2025

概括

土壤的碳储存依赖于微生物死体,用于颗粒有机碳 (POC) 和微生物碳使用效率 (CUE) 矿物相关有机碳 (MAOC). 这些因素共同解释了土壤有机碳 (SOC) 的动态.

科学领域:

土壤科学土壤科学
生物地质化学生物地质化学
微生物生态学微生物生态学

背景情况:

土壤微生物将植物碳转化为有机颗粒碳 (POC) 和矿物相关有机碳 (MAOC) 池.
微生物碳利用效率 (CUE) 是土壤有机碳 (SOC) 存储模型的关键因素,但大规模的经验数据有限.

研究的目的:

实验测试微生物死体和CUE作为POC和MAOC池形成的预测因素.
研究这些预测因素与洛斯高原各种生态系统中SOC积累之间的关系.

主要方法:

收集了来自洛斯高原900公里的气候截面的土壤样本,跨越了各种土地用途 (耕地,草地,灌木地,森林).
使用氨基糖作为微生物死体的代理和18O-H2O方法来测量CUE.
采用随机森林和线性回归分析来确定微生物特性和碳池之间的关系.

主要成果:

最佳的POC和MAOC积累发生在特定的温度 (5-10°C) 和降水 (300-500毫米) 范围内.
微生物死体与POC正相关,真菌死体驱动POC积累,细菌死体驱动MAOC.
微生物CUE与MAOC有关,但与POC或散装SOC无关,这表明它们在碳循环中扮演着不同的角色.

结论:

仅仅依靠CUE不足以预测大量的SOC储存;微生物死体也发挥着关键作用.
微生物死体驱动SOC积累,而CUE主要解释MAOC动态.
整合CUE和微生物丧尸体对于全面了解SOC动态和独特的碳池形成至关重要.

关键词:

气候梯度的梯度是气候的梯度.微生物的新陈代谢微生物残留物的微生物残留物矿物与矿物相关的有机物质.有机物颗粒物有机物颗粒物土壤有机物质土壤有机物质.

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