尿素肥料增加了CO2和CH4的排放量,通过增强C循环基因在半干旱的草原
Xiaojun Wang1, Jie Wang2, Yanuo Zou1
1State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Shaanxi, 712100, PR China; Institute of Soil and Water Conservation, Chinese Academy of Science, Shaanxi, 712100, PR China.
Journal of environmental management
|March 27, 2024
概括
半干旱草原的缩通过改变微生物基因来促进碳循环和温室气体排放. 过度的可能会减少这些对植物生物质和土壤碳的积极影响.
科学领域:
- 土壤科学 土壤科学
- 生态生态学 生态生态学
- 微生物学 微生物学
背景情况:
- 预计全球气候变化将增加对陆地生态系统的 (N) 输入.
- 半干旱的草原容易受到这些变化的影响,影响土壤的碳 (C) 循环.
- 了解丰富对土壤C循环的影响对于预测生态系统反应至关重要.
研究的目的:
- 研究尿素施肥对半干旱草原植物特征,土壤特性和温室气体排放的影响.
- 在不同的N添加水平下分析微生物C循环基因的变化.
- 确定丰富,土壤特性和微生物C循环之间的关系.
主要方法:
- 实地研究用尿素添加 (0-100公斤N ha-1 yr-1) 超过3年.
- 测量植物生物质,土壤特性,二氧化碳和CH4排放.
- 对C循环相关的微生物基因 (C固定,降解,甲生成,甲氧化) 的元基因组学分析.
主要成果:
- 丰富增加了植物生物质和土壤有机C,在高输入 (100公斤N ha-1年-1年) 时收益下降.
- 添加N刺激了卡尔文周期C固定基因,但没有影响其他C固定通路.
- 土壤的CO2和CH4排放随着N的丰富而增加,与C降解,甲生成和甲氧化基因相关.
- 土壤的pH值和可用的N水平是微生物C循环基因变化的关键驱动因素.
结论:
- 土壤缩增强了微生物C循环过程和半干旱草原的温室气体排放.
- 土壤特性,特别是pH值的N诱导的变化显著影响甲代谢.
- 研究结果有助于改进对未来气候变化情景下的生态系统C循环的预测.
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