输入对N2O排放的影响取决于温带沙漠草原的降水量
1Yinshanbeilu Grassland Eco-hydrology National Observation and Research Station, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; Urat Desert-grassland Research Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; Naiman Desertification Research Station, Northwest Institute of Eco- Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; Key Laboratory of Stress Physiology and Ecology in Cold and Arid Region, Gansu Province, Lanzhou 730000, China.
极端降水和输入显著放大了沙漠草原中氧化 (N2O) 排放. 土壤水分和微生物活动是关键的调节因素,表明这些生态系统未来会增加N2O.
科学领域:
- 环境科学 环境科学
- 生态生态学 生态生态学
- 土壤科学 土壤科学
背景情况:
- 氧化 (N2O) 是一种强有力的温室气体和破坏臭氧层的物质.
- 极端降水和 (N) 输入对温带沙漠草原N2O排放的影响仍然不清楚.
研究的目的:
- 调查极端降水和输入对温带沙漠草原N2O排放的相互作用影响.
- 阐明调节这些排放的基本机制.
主要方法:
- 在中国内蒙古 (2018-2021) 现场测量N2O排放.
- 控制 (N) 输入与自然极端降水事件相结合.
- 对土壤属性的分析,包括氨 (NH4+-N) 含量和微生物基因丰度 (amoA (AOB), nosZ).
主要成果:
- N2O排放量一般较低,没有显著的季节性变化.
- 年度N2O排放量随N输入而非线性增加,湿年 (2019年) 的效果远大于干年 (2021年) 的效果.
- 极端降水事件显著放大了N输入对N2O排放的影响,特别是在潮湿的条件下.
结论:
- 极端降水事件,特别是与高输入相结合时,可以大幅增加沙漠草原中的N2O排放.
- 土壤氨度,微生物丰富度 (amoA (AOB), nosZ) 和土壤水分是共同管理N2O流量的关键因素.
- 未来极端降水和沉积的增加可能会导致沙漠草原生态系统的N2O排放量显著增加.
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