土壤微观宇宙中的碳变化导致对H2氧化活性和微生物群落组成的反应不均
Xavier Baril1, Philippe Constant1
1Institut national de la recherche scientifique, Centre Armand-Frappier Santé Biotechnologie, 531 boulevard des Prairies, Laval, Québec H7V 1B7, Canada.
FEMS microbiology ecology
|December 1, 2023
概括
氧化 (HA-HOB) 的土壤细菌对大气中的H2至关重要. 低剂量的反抗性碳刺激HA-HOB,而高剂量的可变性碳抑制它们,影响土壤微生物群落.
科学领域:
- 环境微生物学环境微生物学
- 生物地质化学生物地质化学
- 土壤科学 土壤科学
背景情况:
- 高亲和度H2氧化细菌 (HA-HOB) 是土壤中大气 (H2) 的首要生物沉积点.
- 土壤中的有机碳含量会影响HA-HOB活动,但不同碳水化合物分量的具体影响仍未得到充分研究.
研究的目的:
- 调查碳修正如何影响HA-HOB活动和多样性,这些碳修正在回收和度上有所不同.
- 为了测试碳源性质对HA-HOB产生不同影响的假设.
主要方法:
- 用不同度的不同碳来源 (糖,粉,纤维素) 修改了土壤微观世界 (0-5% Ceq soildw-1).
- 量化了HA-HOB活性,微生物多样性 (细菌和真菌的α多样性) 和[NiFe]-酶基因 (hhyL) 的丰度.
- 开发了一个分类框架,将碳偏好特征分配给微生物基因型.
主要成果:
- 只有低剂量的纤维素 (0.1%) 显著刺激了HA-HOB活性.
- 高度的可变糖 (1%) 大大降低了HA-HOB活动的50%,伴随着微生物多样性和hhyL基因丰度的减少.
- 由于反应不均,碳偏好特征在分类学层面很难预测.
结论:
- HA-HOB活动对土壤碳修正很敏感,低剂量的反抗性碳具有刺激作用.
- 不稳定的富含碳的环境可以为HA-HOB创造不利的,可能导致酶活动的代谢抑制.
- 了解这些复杂的相互作用对于预测在不断变化的环境条件下土壤H2循环至关重要.
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