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Nitrogen additions increase N2O emissions but reduce soil respiration and CH4 uptake during freeze-thaw cycles in an alpine meadow
Wu, Xing; Wang, Fangfang; Li, Ting; Fu, Bojie; Lv, Yihe; Liu, Guohua
2020-04-01
Source PublicationGEODERMA
ISSN0016-7061
Volume363Pages:1-11
AbstractFreeze-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.
Department城市与区域生态国家重点实验室
KeywordNitrogen addition Freeze-thaw cycles Nitrous oxide Soil respiration Methane Alpine meadow
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/44397
Collection城市与区域生态国家重点实验室
Recommended Citation
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.
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