崇明县农业温室气体排放核算

对崇明县农业2005～2009年所排放的CO2、CH4和N2O的量进行了核算，核算结果显示2005～2009年崇明县农业温室气体总量（折算为CO2）由1 038 527 t上升到1 076 993 t，上升比例为37%。其中，CO2和CH4的排放量分别从2005年的460 178 t和12 039 t下降到2009年的441 705 t和11 686 t，下降比例分别为40%和29%，但N2O的排放量则由2005年的1 050 t上升到2009年的1 258 t，上升比例为198%。N2O排放的快速增长和其巨大的增温潜力是影响崇明温室气体排放总量变化趋势的重要因素。核算结果表明，影响崇明农业温室气体排放的主要因素包括化肥使用强度过大和使用效率过低、粪便管理系统效率不高、农产品销售网络不完善等。未来崇明农业应主要从提高可再生能源利用比例和能源利用效率、实施精确施肥以降低化肥使用强度、提高畜禽粪便资源化利用率以及改善剩余农产品销售网络等方面来减少温室气体排放，从而实现可持续的低碳农业

AGRICULTURAL GREENHOUSE GAS EMISSION ACCOUNTING IN CHONGMING

The amount of CO2,CH4 and N2O emitted by agriculture in Chongming from year 2005 to 2009 was accounted.The result showed that from year 2005 to 2009,the total amount(converted to CO2) of agricultural greenhouse gas(GHG)had risen from 1 038 527 t to 1 076 993 t,with a rising percentage of 37%.Among them,the amount of CO2 and CH4 had reduced from 460 178 t and 12 039 t in year 2005 to 441 705 t and 11 686 t in year 2009 respectively,by 40% and 29% respectively.However,the amount of N2O had risen quickly,from 1 050 t in year 2005 to 1 258 t in year 2009,with a rising percentage of 198%.The fast rising of N2O emission and its huge global warming potential was an important factor to effect the trend of total agricultural GHG emission in Chongming.The account result showed that the main factors which effected agricultural GHG emission in Chongming were the too high use intensity and too low use efficiency of chemical fertilizer,faulty feces management system and agricultural products sales network and so on.In the future,agriculture in Chongming should reduce the GHG emission so as to achieve sustainable low carbon agriculture mainly from the four aspects of increasing the use percentage of renewable energy and use efficiency of energy,adopting precise fertilization to reduce the use intensity of chemical fertilizer,raising the recycling percentage of poultry and animal feces,and improving the agricultural products sales network