细菌MAG在永久土活性层的深度特异分布 在 Ny Ålesund,斯瓦尔巴德 (79°N)
Katie Sipes1, Joy Buongiorno1, Andrew D Steen2
1Department of Microbiology, University of Tennessee, Knoxville, United States.
Systematic and applied microbiology
|September 20, 2024
概括
北极土壤微生物群落对气候变化做出反应,水含量可能比温度更有影响. 较深的土壤层含水量较高,支持不同的微生物群体和有机物降解潜力.
科学领域:
- 北极土壤生态学 北极土壤生态学
- 微生物基因组学 微生物基因组学
- 气候变化影响气候变化的影响.
背景情况:
- 北极永久土对气候变化敏感,气温上升和水的可用性变化可能会影响微生物群落.
- 了解微生物对这些环境变化的反应对于预测北极变暖的生态系统功能至关重要.
研究的目的:
- 研究温度和体积含水量 (VWC) 对北极土壤微生物群落结构和功能的影响.
- 鉴定 prokaryotic metagenome-assembled genomes (MAGs) 的特征及其与土壤深度和VWC相关的功能基因潜力.
主要方法:
- 在斯瓦尔巴德永久土中,土壤温度和VWC被监测了两年.
- Prokaryotic MAGs 是从在不同深度和条件 (冷/解) 收集的土壤样本中生成的.
- 在MAG上进行了功能基因分析,以评估碳降解和自身养能力.
主要成果:
- 随着土壤深度的增加,体积水含量 (VWC) 增加,而温度显示季节性变化,但在垂直上相对稳定.
- 酸性细菌群,菌群和菌群是最丰富的细菌群. 酸菌菌群在较浅的土壤 (<6厘米) 中占主导地位,而Actinomycetota和Chloroflexota在6厘米以下的土壤中更为丰富.
- 参与有机物降解的基因随着深度的增加而增加,与更高的VWC相关,这表明VWC是微生物适应的一个关键因素.
结论:
- 北极永久土土壤中的微生物群落组成受到土壤深度和相关的VWC的强烈影响,可能比温度更大.
- 不同的微生物类别和类别对不同的VWC水平表现出不同的适应性,影响土壤碳循环.
- 描述了新的基于MAG的类型物种,包括Onstottus arcticum,Onstottus frigus,Gilichinskyi gelida和Mayfieldus profundus. 这些类型物种包括在内.
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