土壤内的级联效应 食物网络 扩大真菌生物质和死体质量生产
Shixiu Zhang1,2,3, Yakov Kuzyakov4,5, Zhongjun Jia1,2
1State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China.
Global change biology
|May 19, 2025
概括
杂食原始线虫通过控制食者,在未耕种土壤中显著增加真菌死体. 地破坏了这种食用级联,影响了土壤的碳捕获和微生物群落.
科学领域:
- 土壤生态学 土壤生态学
- 微生物生态学 微生物生态学
- 土壤碳封存土壤碳封存
背景情况:
- 土壤的食物网对于调节微生物生物量和死体质量至关重要,影响碳捕获.
- 了解土壤食物网中微生物死体的自上而下的调节是有限的.
- 耕实践显著改变了土壤结构和微生物群落动态.
研究的目的:
- 为了研究食原生线虫的自上而下的力量如何影响土壤食物网中的微生物死体形成.
- 在对比的耕作制度下 (耕作与不耕作) 对黑色土壤进行比较.
- 阐明食物级联在塑造真菌与细菌死体质量比率中的作用.
主要方法:
- 进行了为期一年的13C标记的草现场追踪实验.
- 该实验与Mollisols.的长期耕作试验 (>5年) 进行了整合.
- 使用稳定同位素探测和分析线虫的食习惯.
主要成果:
- 在未耕地土壤中,与耕地土壤相比,真菌与细菌死体的比率显著更高.
- 在没有耕种的土壤中,大量的食肉掠食者大量掠食食动物,减少了食动物的活动.
- 这种捕食者与猎物的相互作用放大了真菌活动和无耕种系统中对死体的贡献.
结论:
- 杂食前性线虫在通过食物级联增强真菌死体形成方面发挥着至关重要的作用.
- 无耕作实践促进了这些相互作用,导致真菌对土壤碳的贡献增加.
- 土破坏了这些有益的土壤食物网相互作用,可能阻碍了碳捕获.
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