土壤真菌群落及其共同发生模式对不同草原类型的放牧排斥的反应
Anjing Jiang1, Yiqiang Dong1,2,3,4, Julihaiti Asitaiken1
1College of Grassland Science, Xinjiang Agricultural University, Ürümqi, China.
Frontiers in microbiology
|July 19, 2024
概括
草地排斥对土壤营养和真菌群落的影响在草地类型之间不同. 虽然它提高了温带草原草原的土壤真菌稳定性,但它阻碍了山地草原的营养恢复,需要定制的恢复策略.
科学领域:
- 生态生态学 生态生态学
- 土壤科学 土壤科学
- 微生物学 微生物学
背景情况:
- 由于过度放牧和气候变化导致的草原退化是全球关注的问题.
- 放牧排斥是一种常见的恢复策略,但它对各种草原生态系统的影响尚未完全理解.
- 土壤真菌群体是环境变化的敏感指标.
研究的目的:
- 调查9年放牧禁令对土壤营养和真菌群落结构在三个不同的草原类型的影响:温带沙漠,温带草原和山草地.
- 确定放牧排斥如何影响土壤的物理化学特性和真菌多样性 (α和β多样性).
- 确定驱动土壤真菌群体组成和网络稳定性的关键环境因素.
主要方法:
- 在三种草地类型中对被放牧和未放牧地块的土壤样本进行比较分析.
- 测量土壤的物理化学特性,包括含水量,pH值,总 (TP) 和与的比率 (N/P).
- 使用高通量测序评估土壤真菌社区结构,分析类型丰富性,α多样性和β多样性.
- 网络分析以评估真菌社区结构,包括平均聚类系数和模块化.
主要成果:
- 在所有草原类型中,放牧排除显著改变了土壤水含量, pH,TP和土壤表层 N/P (0-5 cm).
- 较深层土壤 (5-10厘米) 的土壤营养物质变化仅在山地草中显著.
- 虽然占主导地位的真菌类和α多样性基本保持不变,但在放牧排除的情况下,土壤真菌的β多样性显示出显著的转变.
- 确定pH值是真菌群落结构的主要驱动因素,植物覆盖面影响成分,而放牧排斥通过土壤营养物间接影响真菌.
- 禁放放牧区的真菌网络呈现出更高的平均聚类系数和模块化,表明稳定性增加,特别是在温带草原草原.
结论:
- 放牧排斥对土壤营养和真菌群落的影响不同,具体取决于草原类型.
- 它增强了土壤真菌网络的稳定性在温带草原草原,但不有利于土壤营养恢复在山草原.
- 利用放牧排除的恢复计划应考虑退化草原的特定特征,以获得最佳结果.
- 这项研究强调了土壤真菌β多样性在放牧排斥下调解生态过程中的作用,为草原管理提供了见解.
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