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ABSTRACT
A comprehensive agricultural inventory of ammonia emissions for 2017 in Hefei was established on the basis of the specific emission factors and county-level activity data. The emissions over a 1 km × 1 km grid and the associated monthly variations were distributed on the basis of land-use type and meteorological conditions, respectively. The total ammonia emissions were 27,242.7 t in 2017 in Hefei, to which livestock was the top contributor, accounting for 54.5%. Two major contributors to livestock waste were broilers and laying hens, which contributed 34.5% and 22.2% of the total emissions, respectively. Changfeng, Feixi, and Feidong counties, with more developed agriculture than other counties, accounted for a large proportion of the total ammonia emissions—as much as 28.5%, 24.5%, and 21.0%, respectively. The average emissions density of the whole region was 2.4 t km−2, and the higher values were mostly in areas with denser populations. Seasonally, peak ammonia emissions occurred in summer.
Graphical Abstract
摘要
大气氨是形成细颗粒物和过量氮沉降的主要前体物, 准确编制氨的排放清单对于氨减排策略的制定具有至关重要的指导意义。本研究利用本地化的排放因子, 建立了合肥市2017年高空间分辨率 (1公里) 的农业源氨排放清单。结果表明, 合肥市2017年农业源氨排放总量为27242.7 t, 畜禽源占氨排放总量的54.5%, 其中肉鸡和蛋鸡是畜禽养殖源中最主要的氨排放源。空间分布上, 合肥市平均的氨排放强度为2.4 t km−2, 高值主要出现在人口密度较大的区域, 其中长丰县和肥西县是合肥市农业源氨排放量和排放强度最大的两个城市。时间变化上, 合肥市7月份氨排放量最高。本研究掌握了合肥市农业源氨排放量及其时空变化特征, 有助于为合肥市大气污染防治提供有效的科学支撑。
Disclosure statement
No potential conflict of interest was reported by the authors.
Supplementary material
Supplemental data for this article can be accessed here.