大气中甲类生物在地下石灰岩洞穴中高效地消耗甲:不可否认的甲沉
Xiaoyan Liu1, Xiaoyu Cheng1, Yiming Zhang1,2
1State Key Laboratory of Geomicrobiology and Environmental Change, School of Environmental Studies, China University of Geosciences, Wuhan 430078, China.
Science advances
|February 4, 2026
概括
洞穴微生物,特别是Methyloligotrophaceae家族中的高地土壤群 γ (USCγ),显著氧化甲. 这些甲营养生物是理解地系统作为重要的甲沉积点的关键.
科学领域:
- 地质微生物学的生物.
- 环境科学 环境科学
- 生物地质化学生物地质化学
背景情况:
- 地下石灰岩系统是重要的甲沉积点,但缺乏对甲氧化微生物的表征.
- 洞穴中居住的甲类动物的身份和代谢活动尚不清楚.
研究的目的:
- 为了研究地表地沉积物中的甲氧化率和微生物群落.
- 确定在这些环境中负责甲氧化的特定甲营养物.
- 评估地系统对全球甲循环的贡献.
主要方法:
- 化不同度甲的洞穴沉积物.
- 测量甲氧化速率的方法.
- 使用元基因组学和元转录组学识别甲类植物.
- 使用NanoSIMS和13C标记的脂脂肪酸 (PLFA) 进行稳定同位素探测.
主要成果:
- 甲氧化率随着甲度的增加而显著增加,达到90.7 ng·g-1·hour-1.1.
- 高地土壤集群 γ (USCγ) 甲类植物,属于Methyloligotrophaceae家族 (包括两个新属),被确定为主要氧化剂.
- 使用稳定同位素技术确认了甲作为碳和能源来源.
- 甲类植物表现出低半和常数 (Km; 138.8 ppm) 和高碳同化效率 (>50%).
结论:
- 地下石灰岩生态系统,特别是在中国西南部,充当重要的甲集水池,每年隔离大约0.56 Tg的CH4.
- 已确定的Methyloligotrophaceae甲类植物在减轻这些环境中的甲排放方面发挥着至关重要的作用.
- 石灰岩系统代表了全球甲循环的生态重要和以前被低估的组成部分.
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