Response of N2O and CH4 fluxes and soil respiration to increased precipitation and nitrogen deposition in a temperate desert
Precipitation and nitrogen(N)deposition play vital roles in greenhouse gas emissions.However,information on the response of nitrous oxide(N2O)and methane(CH4)fluxes and soil respiration(Rs)to increase precipitation and N deposition in temperate deserts is still scarce.An in situ experiment was conducted to investigate the effect of increasing precipitation and N deposition on N2O and CH4 fluxes and Rs in the Gurbantunggut Desert,northwest China,from September 2014 to August 2015.The results showed that increasing 5 mm precipitation and N deposition could significantly enhance N2O emission,CH4 uptake and Rs.Elevated extra 30%precipitation significantly increased annual soil CH4 uptake and Rs by 79.10%and 37.17%,respectively.By contrast,only annual N2O emission was significantly enhanced by high N deposition(60 kg N ha-1 yr-1),increased by 109.57%.Significant interaction effect of precipitation and N deposition were found for N2O emission and Rs.And the interaction effect was lower than single-factor for CH4 uptake.N2O emission and Rs were significantly positively correlated to soil moisture and soil temperature,CH4 uptake positively correlated to soil moisture but negatively to soil temperature.However,No significantly correlation were found with soil NO3--N and NH4+-N content.Our results indicated that this desert was a weak sink for CH4 and source of N2O,and increasing precipitation and N deposition have significantly shifted balance of N2O and CH4 fluxes and Rs.
N2O CH4 soil respiration climate change nitrogen deposition precipitation
Ping Yue Xiaoqing Cui Yanming Gong Kaihui Li Keith Goulding Xuejun Liu
State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese College of Resources and Environmental Sciences,China Agricultural University,Beijing 100193,China State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese The Sustainable Soils and Grassland Systems Department,Rothamsted Research,Harpenden AL5 2JQ,UK
国际会议
The 11th International Symposium on Geochemistry of the Earths Surface(GES-11)(第十一届地球表层地球化学国际研讨会)
贵阳
英文
1-2
2017-06-11（万方平台首次上网日期，不代表论文的发表时间）