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土地利用对土壤微生物组合的影响以及对土壤碳循环产生影响的特征

Lisa Cole¹, Tim Goodall², Nico Jehmlich³

¹School of Biological Sciences, University of Aberdeen, St Machar Drive, Aberdeen AB24 3UU, United Kingdom.

ISME communications

|November 14, 2024

概括

土地利用变化通过影响土壤微生物改变土壤有机碳 (SOC). 土壤的pH值决定了强化土地利用是否增加或减少SOC,影响土壤健康和气候变化减缓.

科学领域:

土壤科学土壤科学
微生物学微生物学
生态生态学生态生态学

背景情况:

土壤微生物组影响植物固定的碳命运和土壤有机碳 (SOC) 水平.
土地利用变化改变了土壤的特性,影响了微生物组功能和SOC动态.
土壤pH值是微生物碳循环的关键调节者,但机制尚不清楚.

研究的目的:

在不同的土地使用强度和土壤pH下,调查管理SOC命运的种群-特征关系.
阐明pH控制微生物碳循环路径背后的机制.
了解土地利用强化如何影响微生物生物质,碳利用效率和SOC储存.

主要方法:

利用元蛋白质组学和元编码来进行微生物社区分析.
在两个温带地区进行了13C标记的垃圾分解实验,土壤pH值和土地使用强度相反.
分析了13C融入微生物生物质以及相关的微生物特征.

主要成果:

在低pH的土壤中,随着土地利用的强化,13C的纳入微生物生物质增加,但在高pH的土壤中下降.
土地利用的强化将微生物特征转移到资源获取和耐压力方面,减少生物合成.
观察到不同的SOC循环路径:低pH的土壤呈现出更多的分解和SOC损失,而高pH的土壤呈现出减少的死体和SOC稳定.

结论:

土壤pH值和土地利用强度相互作用,驱动不同的微生物反应和SOC命运.
微生物生物质生产和碳使用效率可以脱离SOC动态.
SOC储存的管理策略需要仔细考虑 pH 取决于土壤健康和气候变化缓解的微生物过程.

关键词:

在13C标签上.碳循环循环的过程碳使用效率的碳使用效率.土地使用强度.超级编码元标段编码.形态保护学与形态保护学土壤健康土壤健康土壤微生物群土壤有机碳土壤有机碳土壤pH值土壤pH值

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