Abstract:

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