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放牧强度改变了土壤微生物多样性及其共同发生网络在阿尔卑斯山草原,中央西藏

Mingxue Xiang^1,2, Zepeng Liang³, Yanjie Zhang⁴

¹State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, China.

|January 25, 2025

概括

放牧强度会影响高山土壤微生物. 适度放牧增加了细菌多样性和网络复杂性,而大量放牧损害了真菌多样性,简化了微生物相互作用,突出了可持续实践的必要性.

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:

阿尔卑斯山草原是敏感的生态系统,受人类活动的影响,如放牧.
不同的牧场强度对土壤微生物群落结构和高山草原相互作用的影响尚未完全理解.
土壤微生物在营养循环和生态系统稳定中发挥着至关重要的作用.

研究的目的:

调查不同放牧强度 (零,中等和重) 对高山草原土壤细菌和真菌多样性的影响.
分析放牧强度如何影响共同发生网络和土壤微生物群落的复杂性.
为了确定影响不同牧场压力下的微生物多样性的关键土壤物理化学因素.

主要方法:

进行了一项受控放牧实验,使用三个治疗方法:零放牧 (CK),中度放牧 (MG) 和重放牧 (HG).
细菌16S rRNA和真菌ITS基因片的高通量测序被用于评估微生物群落.
分析包括α和β多样性,共发生网络构建和线性混合效应建模,以将微生物变化与土壤特性联系起来.

主要成果:

适度放牧 (MG) 显著增加了细菌的香农指数,改变了细菌社区结构.
重度放牧 (HG) 降低了真菌ACE和Chao1指数,并显著改变了真菌社区结构.
可用的土壤影响了细菌多样性,而地下总碳影响了真菌多样性.
MG增加了细菌共发生网络的复杂性,而HG简化了它;MG和HG都减少了真菌网络的复杂性.

结论:

放牧强度对土壤细菌和真菌群落及其在高山草原中的相互作用网络产生不同影响.
适度放牧可能会促进有益的微生物群落,而大量放牧可能会对土壤微生物健康有害.
了解这些微生物反应对于开发阿尔卑斯山草原生态系统中可持续放牧管理策略至关重要.

关键词:

在西藏,西藏是西藏.阿尔卑斯山的草原.同时发生的网络网络.细菌和真菌的多样性细菌和真菌的多样性放牧强度的放牧强度是什么

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