增强的负荷通过调节P循环微生物基因在典型的亚热带河口 (明河),中国东南部改善了土壤的可用性
Huihui Wu1,2, Zhigao Sun3,4, Bingbing Chen1,2,5
1Fujian Provincial Key Laboratory for Subtropical Resources and Environment, Fujian Normal University, Fuzhou, 350007, People's Republic of China.
Environmental microbiome
|December 2, 2025
概括
增强的 (N) 负载增加了沼泽土壤中的 (P) 可用性,通过促进无机P溶解和削弱微生物P固定. 这项研究研究了这些P循环变化的基因基础,这些变化是在N缩下发生的.
科学领域:
- 环境微生物学 环境微生物学
- 土壤科学 土壤科学
- 生物地质化学循环的过程
背景情况:
- 增加的 (N) 负载是影响 (P) 可用性和沼泽土壤循环的关键因素.
- 有限的数据存在于土壤P可用性和微生物基因参与P循环在N丰富下之间的关系.
研究的目的:
- 为了研究增强 (N) 负载对土壤P可用性的影响,在Cyperus malaccensis沼泽.
- 分析P循环功能基因的相对丰度及其对N丰富的反应中的调节作用.
主要方法:
- 一个实地实验进行了四个N负载处理 (N0,Nlow,Nmedium, Nhigh).
- 土壤P可用性和P循环功能基因的相对丰度使用元基因组测序来量化.
- 分析了基因丰度和土壤P分数之间的相关性.
主要成果:
- 总 (TP) 和可用的P分量 (易于和适度可用的P) 与N负载显著增加.
- N丰富改变了P循环基因丰度:无机P溶解基因 (ppa,ppx) 和植物酶基因 (phy,appA) 增加,而P运输 (ugpABEC) 和同化基因 (phoR,phoB,pstABCS,pit) 减少.
- 容易获得的P与无机P溶解基因相关,而适度获得的P与P调节和运输基因相关.
结论:
- 增强的N负载通过促进无机P溶解,增加了土壤P的可用性.
- 在N丰富下微生物P固定能力减弱,有助于增加土壤P的可用性.
- 特定的P循环基因对N丰富具有敏感性,突出显示了微生物对P可用性的调节.
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