Nitrogen additions increase N2O emissions but reduce soil respiration and CH4 uptake during freeze–thaw cycles in an alpine meadow
| العنوان: | Nitrogen additions increase N2O emissions but reduce soil respiration and CH4 uptake during freeze–thaw cycles in an alpine meadow |
|---|---|
| المؤلفون: | Yihe Lv, Guohua Liu, Ting Li, Fangfang Wang, Bojie Fu, Xing Wu |
| المصدر: | Geoderma. 363:114157 |
| بيانات النشر: | Elsevier BV, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | geography, Plateau, geography.geographical_feature_category, Soil Science, chemistry.chemical_element, 04 agricultural and veterinary sciences, Soil carbon, 010501 environmental sciences, 01 natural sciences, Nitrogen, Soil respiration, chemistry, Greenhouse gas, Environmental chemistry, Trace gas fluxes, 040103 agronomy & agriculture, 0401 agriculture, forestry, and fisheries, Environmental science, Incubation, 0105 earth and related environmental sciences |
| الوصف: | 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. |
| تدمد: | 0016-7061 |
| DOI: | 10.1016/j.geoderma.2019.114157 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::cacd0a1104b8b524fec3a32d0b8eb02c https://doi.org/10.1016/j.geoderma.2019.114157 |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi...........cacd0a1104b8b524fec3a32d0b8eb02c |
| قاعدة البيانات: | OpenAIRE |
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