地下微生物群对洞穴生态系统中外源有机物输入的不同反应
Xiaoyu Cheng1, Rui Zhao2, Paul L E Bodelier3
1State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China; Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Droevendaalsesteeg 10, 6708 PB Wageningen, the Netherlands.
The Science of the total environment
|September 30, 2024
概括
极端的暴雨会影响深层生物圈的微生物. 洞穴细菌对溶解有机物 (DOM) 和水分变化的敏感度高于真菌,影响营养循环.
科学领域:
- 微生物学 微生物学
- 生态生态学 生态生态学
- 地质化学 地质化学
背景情况:
- 极端暴雨是与气候变化有关的反复发生的气候事件.
- 这些事件通过转移有机物和增加水分来改变陆地生态系统.
- 暴雨对深层生物圈微生物群落的影响,特别是通过有机物质的输入,尚不清楚.
研究的目的:
- 研究细菌和真菌群落在地下洞穴生态系统中对暴雨和湿度变化的不同反应.
- 阐明溶解有机物 (DOM) 和含水量 (MC) 在调节微生物群体结构和功能的作用.
- 为了比较洞穴细菌和真菌对暴雨事件引起的环境变化的敏感性.
主要方法:
- 实地调查是为了在自然暴雨期间监测微生物群落而进行的.
- 进行了微观宇宙实验,以模拟雨暴条件,控制湿度和DOM输入.
- 分析包括评估细菌和真菌社区组成,资源利用,功能多样性和与DOM和MC等环境因素相关的利基范围.
主要成果:
- 暴雨导致DOM流入洞穴沉积物的增加,增强了核心细菌和环境因素之间的相关性.
- 核心细菌资源的利用率下降,而真菌的功能多样性在暴雨期间基本保持不变.
- 模拟实验表明,增加的MC导致DOM含量减少和微生物多样性增加,与真菌不同,细菌呈现较小的利基范围和与DOM的联系增加.
结论:
- 洞穴细菌对DOM变异比真菌更敏感.
- 核心微生物组有效地利用可用的有机物质,并参与和硫代谢.
- 对暴雨事件的显著微生物反应为深层生物圈生态系统的能源利用提供了洞察力.
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