Characteristics of Greenhouse Gas Emissions from Alpine Farmland in Qinghai Province
Main Article Content
Abstract
In order to better study the effects of fertilizer application on alpine farmland in Qinghai Province, the effects of fertilizer application on greenhouse gas (CH4, CO2 and N2O) emission fluxes and global warming potential of alpine farmland were studied by static chamber-meteorological chromatography method by static chamber chromatography method, and the trend of greenhouse gas emissions from alpine farmland in Qinghai Province was further analyzed. The results showed that the total CO2 emissions of each treatment increased by 24.75%, 1.5N and M by 24.75% and 74.21% compared with CK. Appropriate application of nitrogen fertilizer reduced N2O emissions, and the total emissions of treated N decreased by 48.59% compared with CK. The overapplication of nitrogen fertilizer promoted N2O emissions, and the total emissions increased by 49.56% compared with CK treatment. The application of organic fertilizer can effectively reduce N2O emissions, and the total emission of M treatment is reduced by 97.41% compared with CK. The application of nitrogen fertilizer and organic fertilizer could promote CH4 emissions, and compared with CK, treatment N increased by 70.25%, treatment 1.5N increased by 143.31%, and treatment M increased by 159.58%. Compared with the treatment of CK, the GWP of treatment N, 1.5N and M increased by 175.46%, 341.59% and 445.36%, respectively. The results showed that the application of nitrogen fertilizer and organic fertilizer could promote greenhouse gas emissions, and the degree of promotion treatment M > 1.5N > N > CK. The global warming potential is mainly due to CO2 and CH4, while the contribution rate of N2O is less than 0.5%.
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