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垃圾输入变化对土壤有机碳动态的影响机制:基于微生物碳使用效率的观点

Jia Zeng¹, Xiangyang Li¹, Rui Song²

¹College of Agronomy, Northwest Agriculture & Forestry University, Yangling 712100, Shaanxi, PR China; Shaanxi Engineering Research Center of Circular Agriculture, Yangling 712100, Shaanxi, PR China.

The Science of the total environment

|July 30, 2024

概括

减少植物垃圾的投入,通过提高微生物碳利用效率 (CUE) 和降低微生物呼吸,显著增加了土壤有机碳 (SOC). 相反,加倍的垃圾投入对SOC积累没有显著影响.

科学领域:

土壤科学土壤科学
生态生态学生态生态学
微生物学微生物学

背景情况:

植物垃圾是土壤有机碳 (SOC) 的重要来源,但它对全球变化下的SOC动态的影响仍在争论中.
将垃圾输入变化与SOC变化联系在一起的机制,特别是微生物碳利用效率 (CUE),是不太了解的.

研究的目的:

调查不同的植物垃圾投入如何影响森林生态系统中的SOC积累.
阐明微生物CUE在介导垃圾输入和SOC动态之间的关系中的作用.

主要方法:

在Robinia pseudoacacia种植园进行了一年的实地实验.
处理包括没有垃圾 (NL),自然垃圾 (CK) 和双重垃圾 (DL).
测量涉及土壤微生物营养限制,CUE,代谢系数 (QCO2) 和SOC积累.

主要成果:

与对照组相比,没有垃圾 (NL) 显著增加了微生物C限制,增强了微生物CUE,并减少了QCO2.
在NL处理过程中,SOC积累增加了30.72%.
双 (DL) 对微生物营养限制,CUE,QCO2或SOC积累没有显著影响.

结论:

减少植物垃圾输入可以通过改善微生物CUE和减少呼吸来增强SOC积累.
微生物CUE和QCO2是将改变的垃圾输入与SOC动态联系起来的关键机制.
这些发现为土壤碳循环和陆地碳预算提供了新的见解.

关键词:

垃圾垃圾是一个垃圾.洛斯高原 (Loess Plateau) 是一个高原.代谢分数是指代谢的分数.微生物碳使用效率的微生物碳使用效率.土壤有机碳土壤有机碳

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