环境压力限制了土壤微生物群落的功能,通过调节决定性组合和的宽度来限制这些功能
Xiaojun Wang1,2, Jie Wang3, Ji Chen4
1State Key Laboratory of Soil and Water Conservation and Desertification Control, College of Soil and Water Conservation Science and Engineering, Northwest A&F University, Shaanxi, People's Republic of China.
Molecular ecology
|September 10, 2025
概括
环境压力减少了土壤微生物的多样性,影响了生态系统的功能. 在压力下的低多样性导致决定性组合和广泛的利基,改变微生物基因丰富性和调节生态系统过程.
科学领域:
- 生态生态学 生态生态学
- 微生物学 微生物学
- 环境科学 环境科学
背景情况:
- 由于环境压力而导致的土壤微生物α-多样性损失会损害微生物的功能.
- 微生物α多样性对压力下社区功能的具体影响尚不清楚.
研究的目的:
- 研究细菌和真菌的α多样性如何在环境压力梯度上发生变化.
- 评估草原微生物多样性和功能特征之间的关系.
- 了解将微生物生物多样性与生态系统功能联系起来的生态机制.
主要方法:
- 在45个中国草原中评估了细菌和真菌的α多样性.
- 将五个自然压力因素 (温度,降水,植物多样性,土壤有机C,pH) 量化成一个综合压力指数.
- 利用元基因组分析和家族遗传学零模型来分析基因多样性和社区组合.
主要成果:
- 细菌和真菌的α-多样性在高环境压力下在土壤层中下降.
- 功能性基因多样性沿着应激梯度下降.
- 高压力增加了广泛功能 (例如代谢,复制) 的基因,但减少了专门功能 (例如C,N,S,甲循环) 的基因.
- 随机组装占据了狭窄的高多样性社区;确定性组装占据了广的低多样性社区.
结论:
- 低微生物多样性在高环境压力下促进决定性组合和广泛的利基.
- 这些过程影响微生物基因丰富度,调节关键生态系统功能.
- 研究结果强调了微生物生物多样性和组装机制在陆地生态系统运行中的关键作用.
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