A country-specific, high-resolution emission inventory for methane from livestock in Asia in 2000

摘要

Methane emissions from livestock in South, Southeast, and East Asia were estimated to be about 29.9 Tg CH_4 in 2000 using the Food and Agriculture Organization database and district-level data on regional activity and emission factors, considering regional specificities. These emissions consisted of 25.9 Tg CH_4 from enteric fermentation and 4.0 Tg CH_4 from livestock manure management systems. India had the greatest production, with 11.8 Tg CH_4 from livestock, primarily cattle and buffaloes. China was also a high-emission country, producing about 10.4 Tg CH_4. To determine their spatial distribution, emissions at the country and district levels were plotted on a 0.5 x 0.5° grid according to weight, using high-resolution land cover/use datasets. This gridded database shows considerable emissions throughout the Ganges basin, with peak emissions exceeding 30 Gg CH_4 grid~(-1) in the Ganges River delta. The total methane emissions from livestock increased by an average of 2% per annum from 1965 to 2000. The recent increase in methane emissions in China was especially remarkable.