草原转化为耕地增加了土壤功能基因的空间异质性
Junjie Liu1, Yaping Guo2, Haidong Gu1
1State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, 150081, P R China.
The ISME journal
|August 22, 2023
概括
从自然草原到农业土壤的土地利用变化使土壤微生物组功能多样化,增加了不稳定的碳基因,但减少了反抗性化合物和营养循环的基因. 这挑战了同质化假设.
科学领域:
- 土壤科学 土壤科学
- 微生物组研究的研究.
- 生态生态学 生态生态学
背景情况:
- 土地利用变化对土壤生态功能产生重大影响.
- 了解土壤微生物组的功能转变对于预测人类影响下的土壤健康至关重要.
- 土壤微生物群落的生物地理模式因土地利用转换而改变.
研究的目的:
- 研究土壤微生物功能组成的变化,从天然的草原到农业土壤.
- 描述土壤功能基因沿着空间和环境梯度的生物地理模式.
- 评估土地使用变化对土壤功能阿尔法多样性和社区组装的影响.
主要方法:
- 从中国东北部的自然草原 (NS) 和农业土壤 (AS) 采集了土壤样本.
- 枪支测序被用来描述土壤的功能基因组成.
- 中立社区模型和正常化随机率被应用来分析社区集会过程.
主要成果:
- 农业土壤表现出更高的功能阿尔法多样性 (KO特征丰富度,香农指数),而不是自然的草原土壤.
- 功能性基因组成的距离-衰变关系在农业土壤中更为.
- 土地利用转换增加了可变碳的基因,但减少了反抗基质,P和S循环的基因.
- 随机过程在驱动功能基因组成方面占主导地位,在自然的草原土壤中,随机性更高.
- 核心功能基因α-多样性与农业土壤中的多营养循环相关.
结论:
- 自然草原转化为农业用地使土壤功能基因概况多样化,这与同质化假设相反.
- 土地使用变化改变了微生物群落的组合,有利于自然草原土壤的随机性.
- 农业系统中的土壤功能多样性与营养循环和土壤肥力有关.
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