Nitrogen additions increase N2O emissions but reduce soil respiration and CH4 uptake during freeze-thaw cycles in an alpine meadow
文献类型：期刊论文
| 作者 | Wu, Xing; Wang, Fangfang; Li, Ting; Fu, Bojie ; Lv, Yihe; Liu, Guohua
|
| 刊名 | GEODERMA
 |
| 出版日期 | 2020-04-01 |
| 卷号 | 363页码:1-11 |
| 关键词 | Nitrogen addition Freeze-thaw cycles Nitrous oxide Soil respiration Methane Alpine meadow |
| ISSN号 | 0016-7061 |
| 英文摘要 | Freeze-thaw cycles (FTCs) and increasing nitrogen (N) availability may affect soil carbon (C) and N turnover and thus stimulate greenhouse gas (GHG) emissions in cold regions. However, the combined effects of FTCs and increased N availability on GHG fluxes remain unexplored, especially in high-altitude alpine meadows. We conducted an incubation study to investigate the effects of different forms and levels of N additions on soil trace gas fluxes during three FTCs in an alpine meadow on the Qinghai-Tibetan Plateau. Our results showed that the N2O and CO2 emissions as well as CH4 uptake substantially increased during FTCs. N additions generally enhanced the freeze-thaw-related soil N2O emissions but inhibited soil respiration and CH4 oxidation. NO3--N additions induced significantly higher cumulative N2O emissions during FTCs than NH4+-N additions. The soil respiration rates were significantly reduced with increasing levels of N additions and were positively correlated with the soil DOC and MBC contents. Soil CH4 uptake was substantially inhibited by increasing levels of NH4+-N additions, but was significantly reduced only by high levels of NO3--N additions. Our results indicate that N addition plays an important role in affecting soil GHG fluxes during FTCs. The effects of different forms and levels of N additions on soil GHG fluxes should be considered in future estimations of GHG budget in alpine meadows under a changing climate. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/44397]  |
| 专题 | 生态环境研究中心_城市与区域生态国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Wu, Xing,Wang, Fangfang,Li, Ting,et al. Nitrogen additions increase N2O emissions but reduce soil respiration and CH4 uptake during freeze-thaw cycles in an alpine meadow[J]. GEODERMA,2020,363:1-11. |
| APA | Wu, Xing,Wang, Fangfang,Li, Ting,Fu, Bojie,Lv, Yihe,&Liu, Guohua.(2020).Nitrogen additions increase N2O emissions but reduce soil respiration and CH4 uptake during freeze-thaw cycles in an alpine meadow.GEODERMA,363,1-11. |
| MLA | Wu, Xing,et al."Nitrogen additions increase N2O emissions but reduce soil respiration and CH4 uptake during freeze-thaw cycles in an alpine meadow".GEODERMA 363(2020):1-11. |
入库方式： OAI收割
来源：生态环境研究中心
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