南京和北京城市天然源挥发性有机物排放差异

以南京市和北京市优势树种为研究对象,利用森林资源清查数据、小时气象观测资料和G95光温模型算法对中国南北典型城市南京和北京地区2015年森林天然源挥发性有机化合物(BVOCs)排放总量进行估算.研究发现,南京市总BVOCs排放主要来自湿地松、栎树类和杨树,北京市主要优势树种BVOCs排放量最高的是栎树类、杨树和油松.从...

Differences of biogenic volatile organic compound emissions from urban forests in Nanjing and Beijing

Total emissions of BVOCs from typical cities (e.g. Beijing and Nanjing) in south and north China in 2015 were estimated by using the data of forest resource check, hourly meteorological observation and G95model algorithms based on light and temperature dependences. The study found that the total BVOC emissions in Nanjing were mainly derived from Slash pine, Quercus and Poplars. Among the dominant tree species in Beijing, Quercus, Poplars and Chinese pine had the highest BVOC emissions. From the total emissions, the VOC emissions from forest sources in Beijing were 2 to 3times higher than those of Nanjing, which were 72114.1t/a and 28025.3t/a, respectively. By contrast, the area-based BVOCs emission intensity in Nanjing was 1.6 times higher than those of Beijing. The seasonal changes of all types of BVOC emissions in both Beijing and Nanjing were unimodal, with the highest emissions in summer and the lowest in winter, while there was little difference in emissions between spring and autumn. In Nanjing, middle-aged forests and near-mature forests were the main emission sources of BVOCs. However, middle-aged forests and young forests were the main emission sources in Beijing. The contribution to total BVOC emissions in each tree age class was mainly determined by its leaf biomass, but the type of dominant tree species in each tree age class also affected the emission of BVOCs to a certain extent.