在遭受长期添加的温带森林中,可用的的土壤微生物调节背后的机制
Shiqi Wang1, Minghua Song2, Chunmei Wang1
1College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
The Science of the total environment
|August 19, 2023
概括
添加会改变土壤微生物和 (P) 功能基因. -N增强有机P基因,但降低P运输基因,而酸-N降低它们. N可用的沉积极限 P 通过影响微生物群落和 P 循环基因.
科学领域:
- 土壤科学 土壤科学
- 微生物学 微生物学
- 生物地质化学生物地质化学
背景情况:
- 外源 (N) 输入可以使 (P) 成为植物的限制营养素.
- 土壤微生物及其功能基因是土壤P循环和可用性的关键调节者.
- 不同的N形式和速率对P循环微生物群落和基因丰度的影响仍然不清楚.
研究的目的:
- 调查不同化学形式和速率的N添加如何影响参与P循环的土壤微生物的组成.
- 确定N添加对P功能基因丰富性的影响.
- 阐明N对土壤P可用性的影响的潜在机制.
主要方法:
- 一个长期的实地实验涉及N添加 (三种化学形式,两种速度) 在温带森林.
- 分析与P循环相关的土壤微生物群落组成.
- 量化各种P功能基因的丰富性.
主要成果:
- 在不同的P-溶解微生物中选择了N形式和速率;在两种速率下,氨-N增加了细菌的丰富性.
- 沉积降低了土壤的pH值,抑制了细菌的活力和活动,从而限制了无机P的动员,并减少了可用的P.
- -N增强了有机P矿化基因,但减少了P运输基因,而酸-N显示了矿化基因的相反趋势.
- 添加N通常会减少无机P溶解基因,但例外情况 (ppx,ppa) 显示丰度增加.
结论:
- 添加N改变了土壤的特性,包括pH值,这间接影响了P循环微生物群落和功能基因丰度.
- N诱导的P限制是通过微生物对P-溶解微生物和P功能基因丰度的微生物调节来解释的.
- 了解这些微生物和遗传反应对于预测森林生态系统对沉积的反应至关重要.
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