山东省植物源挥发性有机物排放特征及清单构建

Emission inventory and characteristics of BVOCs in Shandong Province

为探究山东省植物源挥发性有机物(BVOCs)的排放,利用最新的普查结果——第九次一类植物清查报告,参考其他研究中涉及本研究对象植物的BVOCs排放因子,使用光温模型对2016年山东省植物源挥发性有机物的排放量进行估算,并探究其对区域空气质量的影响。基于对16种优势植被类型的测算,2016年山东省BVOCs排放总量为198.0 Gg/a,异戊二烯排放量为176.5 Gg/a,占比89.1%;单萜烯和OVOCs排放量分别为:16.4和5.1 Gg/a,占比8.3%和2.6%。7月BVOCs排放量最高,占比29.1%,其中异戊二烯、单萜烯和OVOCs的占比分别为90.8%,7.1%和2.1%。BVOCs季节变化明显,除冬季外主要排放异戊二烯,冬季主要排放单萜烯和OVOCs。杨树是主要的异戊二烯和BVOCs排放量的贡献者,排放量为84.2 Gg/a。草地是单萜烯排放量最大的植物,排放量为11.4 Gg/a。BVOCs对臭氧生成潜势的贡献量为1938.9 Gg/a,异戊二烯是主要的贡献者,占比96.6%。BVOCs对二次有机气溶胶(SOA)生成潜势的贡献为8.5 Gg/a,异戊二烯和单萜烯分别占比41.7%和58.3%。

In order to study the emission of biogenic volatile organic compounds(BVOCs) in Shandong Province, this study calculated the emission inventory of BVOCs in the year of 2016 in Shandong Province by using the latest data of the 9th Class I plant inventory report and referring to the BVOCs emission factors of various plants in other studies. The global model was applied and the influence of the emission on the regional air quality was examined. According to the calculation of 16 types of plants, the total emissions of BVOCs in Shandong Province were 198.0 Gg/a, and the emissions of isoprene were 176.5 Gg/a, accounting for 89.1% in 2016. The emissions of monoterpenes and OVOCs were 16.4 and 5.1 Gg/a, accounting for 8.3% and 2.6% respectively. BVOCs had the highest emission flux in July, accounting for 29.1%. The proportions of isoprene, monoterpenes and OVOCs were 90.8%, 7.1% and 2.1% respectively. The seasonal variation of BVOCs was obvious, with the chief emissions in winter being monoterpenes and OVOCs and in other seasons being isoprene. Poplar was a major contributor to BVOCs and isoprene emission, which was 84.2 Gg/a. The monoterpenes emission of grassland was 11.4 Gg/a, which was the most emitted. The contribution of BVOCs to the formation potential of ozone was 1938.8 Gg/a and isoprene was the main contributor, accounting for 96.6%. The contribution of BVOCs to the formation potential of secondary organic aerosol(SOA) was 8.5 Gg/a, with isoprene and monoterpenes accounting for 41.7% and 58.3% respectively.