| Autor: |
Ming-Jie Li, Yi-Qing Ge, Hasbagan Ganjurjav, Guo-Zheng Hu, Hong-Bao Wu, Jun Yan, Shi-Cheng He, Qing-Zhu Gao |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
Advances in Climate Change Research, Vol 15, Iss 1, Pp 101-112 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
1674-9278 |
| DOI: |
10.1016/j.accre.2024.01.007 |
| Popis: |
Warming and nitrogen (N) addition may impact soil nitrous oxide (N2O) emissions, but the relationship between plant community composition and soil microbial activities remains unclear. For a two-year field study in the Qinghai‒Tibet Plateau, open-top chambers were used to quantify the effects of warming, N-addition, and their interactions on N2O emissions. We found that the N-addition greatly increased N2O emissions by 77.4% in 2018 when compared to the control group. In contrast, warming showed little effect on N2O emissions but did increase the activity of enzymes associated with soil nitrification and denitrification. A combined effect of warming and N-addition of resulted in 208.6% (2018) and 90.8% (2019) increase in N2O emissions, respectively, compared to the individual treatments of warming or N-addition. Global warming in alpine meadows is causally linked to increased legume biomass which is further intensified with the N-addition. Intensified legume biomass (p < 0.05), soil moisture (p < 0.001) and enzyme activity (p < 0.001) had a positive effect on N2O emissions, while diminished microbial carbon/nitrogen (MBC/MBN) (p < 0.05) correlated with reduced N2O emissions. Final results indicated that N-addition has a positive effect on N2O emissions, and the addition of warming further intensifies this effect. The increased dominance of legumes and microbial N content contributes to this effect. These outcomes suggest that warming and atmospheric N deposition can stimulate N2O emissions of alpine meadows in the future. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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