四川省秸秆露天焚烧污染物排放清单及时空分布特征

根据收集的活动水平数据,采用排放因子法建立了四川省2012年秸秆露天焚烧污染物排放清单,并分析了污染排放的时空分布特征.结果表明,2012年四川省秸秆露天焚烧共排放SO2、NOx、NH3、CH4、NMVOC、CO、PM2.5、EC以及OC分别为1 210、12 185、2 827、20 659、40 463、292 671、39 277、1 984以及10 215 t;水稻、小麦、玉米、油菜是四大主要的焚烧作物秸秆,对污染物的总贡献率约为88%~94%;秸秆露天焚烧受农作收获的影响,全年的排放主要集中在7~8月,而5月是上半年的一个排放小高峰;秸秆焚烧排放的高值地区主要分布在成都平原、川北地区以及川南地区,川西地区排放分布相对较少;本清单的不确定性主要来自排放因子及秸秆焚烧量.

Emission Inventory of Crop Residues Field Burning and Its Temporal and Spatial Distribution in Sichuan Province

Based on the collected activity data, the 2012 emission inventory of crop residues field burning in Sichuan province was developed through the emission factor approach. Besides, the temporal and spatial distribution of pollutant emissions was also analysed in this paper.The results showed that the total emissions of SO₂, NO_x, NH₃, CH₄, NMVOC, CO, PM_2.5, EC and OC from crop residues field burning in Sichuan province in the year of 2012 were 1210, 12185, 2827, 20659, 40463, 292671, 39277, 1984 and 10215 t, respectively; The rice straw, wheat straw, corn straw and oil rape straw were four major contributors to pollutant emissions, with a total contribution about 88%-94%; Crop residues field burning emissions were affected by agricultural harvesting. Temporally, the emissions were concentrated in July and August with a small peak in May; Spatially, the Chengdu plain, the Northern area and the Eastern area of Sichuan province were the highest emission areas, while the Western area had relatively low emissions; The key uncertain sources included emission factors and parameters used for estimating crop burning amounts.