Increased Nitrous Oxide Emissions Resulting from Nitrogen Addition and Increased Precipitation in an Alpine Meadow Ecosystem
Yangong Du1,2,3, Xiaowei Guo2,4, Guangmin Cao2 ,Yikang Li2
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1Key Laboratory of Mountain Surface Processes and Ecological Regulation,
Institute of Mountain Hazards and Environment, Chinese Academy of Sciences,Chengdu 610041,China
2Key Laboratory of Adaptation and Evolution Plateau Biota, Northwest Institute of Plateau Biology,
Chinese Academy of Science, Xining 810008, China
3NSW Department of Industry, Skills and Regional Development, Wagga Wagga Agricultural Institute,
NSW 2650, Australia
4Graham Centre for Agricultural Innovation
(an alliance between NSW Department of Industry and Charles Sturt University,
Wagga Wagga, NSW 2650, Australia)
Submission date: 2015-04-20
Final revision date: 2015-11-30
Acceptance date: 2015-12-02
Publication date: 2016-01-25
Pol. J. Environ. Stud. 2016;25(1):447-451
The effects of nitrogen (N) addition and increased precipitation on nitrous oxide (N2O) emissions in alpine meadow ecosystems are still unclear. In this study, we measured N2O fluxes on the Tibetan plateau under interactions of moderate atmospheric N deposition and increased precipitation using a closed chamber method. Under all applied treatment conditions, the alpine meadow ecosystem acted as a source of N2O. The N2O emission rate reached a maximum of 74.83±14.40 μg m-2 h-1, with a significant increase in emission rate of 68.76% following N addition when compared with the control plot (p<0.05). Increased precipitation, and its interactive combination with N deposition, enhanced the N2O emission rate by 53.90% and 44.52%, respectively. However, there was no significant difference between these two treatments. Increased precipitation would help to mitigate N2O fluxes under global nitrogen deposition conditions.
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