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有机肥料而不是化学肥料通过调节高地红土中的相关微生物功能特征来改善黑暗CO2的固定

Qian Wang¹, Mengmeng Liu¹, Jingshi Huang¹

¹Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of Geographical Sciences, Nanjing Normal University, Nanjing 210023, China.

The Science of the total environment

|September 20, 2024

概括

有机肥料通过黑暗的二氧化碳固定显著增加了土壤的碳捕获,增强了微生物的基因和途径. 然而,化学肥在高地红色土壤中减少了这一关键过程.

科学领域:

土壤科学土壤科学
微生物学微生物学
生物地质化学生物地质化学

背景情况:

黑色微生物的二氧化碳 (CO2) 固定对于土壤碳封存至关重要.
了解基因基础和对施肥的反应对于土壤健康至关重要.
以前的研究缺乏关于遗传信息和受精影响的全面数据.

研究的目的:

为了研究暗 CO2 固定所涉及的遗传信息.
为了确定不同施肥模式对暗 CO2 固定率的影响.
探索微生物功能特征与二氧化碳固定之间的关系.

主要方法:

使用13C-CO2标签来量化山区红色土壤中暗 CO2 固定率.
分析了暗 CO2 固定基因 (KO 水平) 的丰富性和多样性.
使用的部分最小平方结构方程建模 (PLS-SEM) 来评估关系.

主要成果:

与控制 (CK) 相比,与有机 (OM) 相比,暗 CO2 固定率显著更高,与化学 (N) 肥料相比,更低.
二氧化碳固定基因的基因丰度和多样性 (Chao1指数) 在OM土壤中最高,在N土壤中最低,与固定率正相关.
DC/4-HB循环在OM土壤中进行了丰富,而3HP循环在N土壤中进行了丰富,显示了与固定率的差异相关性.

结论:

受到OM影响的土壤特性增强了微生物的功能特征,促进了深色CO2的固定.
施肥方案显著改变微生物基因组成和二氧化碳固定途径.
微生物的功能潜力是解释和预测土壤二氧化碳固定的一个关键因素.

关键词:

酸性高地土壤酸性高地土壤碳化合物2) 固定方式.代谢途径代谢途径转基因组学是指转基因组学.

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