原生体调节了在土壤聚合物中微生物介导的有机碳循环
Hao Liao1,2, Xiuli Hao1,2, Yiting Li1
1National Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China.
Global change biology
|January 26, 2024
概括
土壤原生体通过 trofic 相互作用调节土壤碳循环. 细菌类原生虫对土壤有机物有负面影响,而食肉类则对土壤有积极影响,影响碳分解和封存.
科学领域:
- 土壤生态学 土壤生态学
- 微生物学 微生物学
- 生物地质化学生物地质化学
背景情况:
- 土壤原生虫是土壤微生物群落和营养循环的关键调节者.
- 质地热层相互作用对土壤有机物 (SOM) 周转的影响尚未完全理解.
- 聚合物大小分数显著影响土壤微生物群落的结构和功能.
研究的目的:
- 调查原生态社区及其食用相互作用如何影响土壤有机碳周转,跨不同聚合物大小.
- 阐明不同原生体的功能性群体 (细菌动物,万食动物) 在SOM动态中的作用.
- 评估长期受精方案对这些相互作用的影响.
主要方法:
- 在长期施肥下对农业土壤进行采样.
- 分析不同总体大小分数的Protistan社区.
- 应用部分最小方形路径建模来评估热带相互作用及其对碳循环基因和SOM的影响.
- 网络分析,以评估微生物的营养互动.
主要成果:
- 聚合物大小显著影响了原生体群落和微生物相互作用;细菌类占主导地位,而杂食类在微聚合物中更为丰富.
- 杂食原虫对碳分解基因和SOM产生了积极影响,而细菌类则表现出负面影响.
- 在宏观聚合物和泥+粘土部分中,原生菌与细菌的关联性和网络复杂性更高,Cercozoans被确定为SOM降解中的关键物种.
- 化学肥料抑制了SOM在宏积聚物和泥+粘土中的降解,增强了土壤碳捕获.
结论:
- 在农业生态系统中,对调节土壤碳循环至关重要.
- 聚合结构调解了前列腺养协会对SOM营业额的影响.
- 了解这些相互作用对于预测不同管理实践和环境条件下的土壤碳动态至关重要.
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