A Study On The Temporal And Spatial Variation During Methane And Nitrous Oxide Emission In Agriculture Of Fujian Province

Agricultural greenhouse gases mainly included CH4 and N2O,with the increasing of CH4 and N2O emission,surface temperature and precipitation rose and impacted on agricultural activities seriously.Based on the statistical yearbook data of 1980-2011,the article estimated the amount of 32 years of CH4 and N2O emission(rice fields of CH4 emission,animal gut fermentation of CH4 emission,the process of animal waste management of CH4 and N2O emission,cropland of N2O emission)in Fujian province by the IPCC method,compiled nearly 32 years of the entire province various counties city of CH4 and N2O emission inventory,compared and analyzed the reason for the differences of regional temporal and spatial emission.In the end of the paper,according to the emission trend from 2012 to 2015,put forward suggestions for CH4 and N2O emission reduction in the future.The main results are as follows:1.Since form 1980 to 20115 the total emissions of Methane are 12,197,100 tons in Fujian province and the average annual emissions are 381,500 tons.The total emissions of Nitrous oxide are 553,600 tons,17,300 tons for average annual level.Converted to Carbon dioxide equivalent,between 1980 and 2011,Methane and Nitrous oxide of Fujian province total emission of Carbon dioxide equivalent of 469,901,900 tons and 14,684,400 tons for annual mean,Including 304,926,900 tons of Methane and 164,974,600 tons of Nitrous oxide and the percent of Methane and Nitrous oxide respectively are 64.89%and 35.11%.2.The emissions of Methane and Nitrous oxide increase slightly overall and the emissions in south and north in total province are more than the part of east and west.The Methane and Nitrous oxide emissions of Coastal areas increased,while changing smoothness in a mountainous area.Especially in Zhangzhou and Quanzhou city,the increments are a little higher than other coastal cities and mountainous areas.3.Thorough calculation and analysis,the emissions of Methane and Nitrous oxide converting to Carbon dioxide equivalent are 12,327,600 tons,12,013,200 tons,11,681,000 tons and 11,330,800 tons from 2012 to 2015,which showed a trend of decline each year,but every year decreased slightly.