在植物废物堆肥过程中,C/N比对N2O排放和的功能基因的影响
Jingang Xu1,2, Zhi Zhang2, Yupeng Wu3
1Department of Environmental Science and Engineering, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, China.
Environmental science and pollution research international
|April 24, 2024
概括
在植物废物堆肥过程中增加碳 (C/N) 比率,可显著减少氧化 (N2O) 排放. 较高的C/N比率抑制了参与N2O生产的关键微生物基因,增强了堆肥.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 土壤科学 土壤科学
背景情况:
- 在堆肥过程中产生氧化 (N2O) 会导致的损失和农业价值的降低.
- 了解影响N2O排放的因素对于可持续的废物管理至关重要.
研究的目的:
- 调查不同C/N比对植物废物堆肥过程中N2O排放的影响.
- 阐明影响不同C/N比率的N2O生产的潜在遗传机制.
主要方法:
- 用三个C/N比率处理的堆肥实验:低 (18),中 (30),高 (50).
- 在整个堆肥过程中量化N2O排放.
- 对分数 (总,NH4+-N,NO3--N) 和化/脱化相关基因的丰富性 (例如,hao,nosZ,narG,napA,norB) 的分析.
主要成果:
- 累计的N2O排放量随着C/N比率的增加而显著下降 (LT:57,401 mg;MT:2155 mg;HT:1353 mg).
- 较低的C/N比率导致较高的总,NH4+-N,以及NO3--N.
- 在较低的C/N比率下,化基因的丰度增加,而在较高的C/N比率下,特定的脱基因 (narG,napA,norB) 减少.
- 结构方程建模确定了hao和nosZ基因作为N2O排放的关键驱动因素.
结论:
- 提高C/N比率是一种有效的策略,可以减轻植物废物堆肥产生的N2O排放.
- C/N比率通过改变土壤中含量和涉及循环的关键微生物基因的丰富性来影响N2O生产.
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