在酸盐施肥后,来自各种被洪水淹没的田土壤的明显的氧化排放:确定关键影响因素
Yu Zhou1, Jian Zhang2, Jian Zhu3
1MOE Key Laboratory of Karst Georesources and Environment, Guizhou University, Guiyang, 550025, China.
Journal of environmental management
|September 22, 2025
概括
肥增加了土壤的氧化 (N2O) 排放. 像pH值,溶解有机碳 (DOC) 和铁等土壤特性影响微生物脱,影响N2O释放和农业温室气体产量.
科学领域:
- 农业科学 农业科学
- 环境科学 环境科学
- 土壤科学 土壤科学
背景情况:
- 肥对农业至关重要,但也是氧化物 (N2O) 的主要来源,这是一个强大的温室气体.
- 土壤中的脱过程释放N2O,但在酸盐化肥后控制其排放的因素尚未完全理解.
- 了解N2O排放机制对于减轻农业温室气体影响至关重要.
研究的目的:
- 调查酸盐施肥后来自中国南部不同土壤的N2O排放的驱动因素和机制.
- 确定影响脱和N2O生产的关键土壤物理化学性质.
- 为减少农业实践中N2O排放提供见解.
主要方法:
- 将酸盐 (NO3-N) 肥料应用于来自中国南部的四种不同的土壤类型.
- 进行了无氧化化实验,以测量N2O排放.
- 分析了土壤的物理化学特性 (pH,DOC,Fe) 和微生物功能基因 (nirK,nirS,nosZ).
主要成果:
- 在土壤类型之间观察到N2O排放的显著变化 (43倍差异).
- 土壤pH值,溶解有机碳 (DOC) 和Fe (II) 被确定为控制N2O排放的核心因素.
- 高 (GQ) 土壤的低pH,高DOC和Fe ((II)) 通过改变微生物基因比率 (nosZ/ ((nirK + nirS)) 来促进N2O积累.
- 旺山 (WS) 土中的高pH,低DOC和Fe (II) 有助于nosZ基因表达,减少N2O排放.
结论:
- 土壤的物理化学特性 (pH,DOC,Fe) 显著影响参与脱的细菌群落.
- 这些微生物群落的转移,特别是nosZ/(nirK + nirS) 比率,直接影响N2O排放水平.
- 该研究提供了对各种土N2O排放的机制性理解,为减排策略提供了基础.
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