洛阳市2017年大气氨排放清单的建立及其空间分布特征

基于洛阳市不同类型氨排放源的活动水平数据,主要采取排放因子法构建了2017年洛阳市大气氨排放清单,并以GIS技术为基础进行2 km分辨率的空间网格分配。通过研究得出,2017年洛阳市的大气氨排放量为63.2 kt,排放强度达到4 t/km~2以上,全市主要的氨排放源为畜禽养殖和农田生态系统,排放量分别为43.7 kt和10.4 kt,分别占氨排放总量的69.2%和16.5%。在畜禽养殖源中,肉牛是最大的贡献源,贡献率为30.4%;在农田生态系统中,氮肥施用是最大的贡献源,贡献率为87.7%。各区县中,宜阳县和伊川县排放量最大,共占氨排放总量的32.0%;偃师市、伊川县为排放强度最高;空间分布特征上呈现北部氨排放量大、南部排放量少、在城市区周边氨排放量较突出的现象。

The Establishment of the Anthropogenic Ammonia Emission Inventory and Its Spatial Distribution Characteristics in Luoyang City in 2017

Based on the activity level data of diverse ammonia sources, an anthropogenic ammonia emission inventory of Luoyang City in 2017 was established mainly using the emission factor method.The spatial gridded allocation of 2 km resolution was carried out by using GIS technology.The results showed that the total anthropogenic ammonia emission reached 63.2 kt in 2017, and the emission intensity was more than 4 tons per square kilometer, the major sources of anthropogenic ammonia emission were the livestock breeding and agroecosystem, which were 43.7 kt and 10.4 kt, accounting for 69.2% and 16.5%, respectively.Beef cattle was the major source of livestock and poultry breeding, which occupied 30.4% in livestock breeding emission.Nitrogen fertilizers were the major sources of agroecosystem, which occupied 87.7% in agroecosystem emission.Among the districts and counties, Yiyang County and Yichuan County had the largest emissions, accounting for 32.0% of total ammonia emissions.The emission intensities of Yanshi and Yichuan were larger than those of other regions.The spatial distribution showed that ammonia emission was larger in the North than that in the South, and the ammonia emission around the urban area was more prominent.