南京和北京城市天然源挥发性有机物排放差异

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摘要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.从排放总量来看,北京市森林BVOCs排放量是南京的2~3倍,分别为72114.1和28025.3t/a,但南京市单位面积BVOCs排放通量是北京市的1.6倍.两市各类BVOCs排放量季节变化均呈单峰型,即夏季排放最高,冬季最低,春秋季排放量相差不大.南京市的中龄林和近熟林为主要BVOCs排放源,北京市BVOCs的主要排放源是中龄林和幼龄林.总BVOCs排放量在各龄级的比例主要由其叶生物量决定,但各龄级内部优势树种类型不同也一定程度地影响BVOCs排放.

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关键词 ：南京, 北京, 蓄积量, 优势树种, 植物源挥发性有机化合物(BVOCs)

Abstract：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.

Key words： Nanjing Beijing forest stock dominant tree species biogenic volatile organic compounds (BVOCs)

收稿日期: 2021-08-30

PACS:

X511

基金资助:国家自然科学基金资助项目(41907383,42061160479);国家重点研发计划项目(2017YFE0127700)

通讯作者: 冯兆忠,教授,zhaozhong.feng@nuist.edu.cn E-mail: zhaozhong.feng@nuist.edu.cn

作者简介: 袁相洋(1990-),男,山东滕州人,助理研究员,博士,主要从事全球变化与陆地生态系统相互作用研究.发表论文20余篇.

引用本文:

袁相洋, 许燕, 杜英东, 冯兆忠. 南京和北京城市天然源挥发性有机物排放差异[J]. 中国环境科学, 2022, 42(4): 1489-1500. YUAN Xiang-yang, XU Yan, DU Ying-dong, FENG Zhao-zhong. Differences of biogenic volatile organic compound emissions from urban forests in Nanjing and Beijing. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(4): 1489-1500.

链接本文:

http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2022/V42/I4/1489

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