Abstract: To estimate the spatiotemporal distribution of biogenic volatile organic compound (BVOC) emissions in China, this study collected data on vegetation volume and production from the national forest and grassland inventory, Statistical Yearbooks, and a 1:1000000 vegetation map of China. These data were converted to leaf biomass data and then used in Guenther’s BVOC emission model, and spatiotemporal and source distributions of BVOC emissions were estimated, establishing a BVOC emission inventory for mainland China. In 2003, the annual total BVOC emission in China was estimated to be 12.83 Tg, composed of 7.45 Tg (58%) isoprene, 2.23 Tg (17%) monoterpenes, and 3.14 Tg (25%) other VOCs (OVOCs). Emissions varied significantly among plant species, with contributions to total emissions by vegetation type ordered as follows: forests (61%) > shrubs (27%) > crops (7%) > grasslands (5%). Southern and northeastern China were the main sources of BVOC emissions. Significant seasonal variation was found in the BVOC emissions. The most emissions occurred in summer. Forest contribution to BVOC emissions varied by age class, with middle-aged forests contributing the most.

Key words: biogenic volatile organic compound, emission inventory, spatiotemporal distribution, volume

摘要： 以中国植被为对象, 基于森林、草地资源清查和统计年鉴提供的各类植被蓄积量、产量资料以及《中国植被图(1:1000000)》提供的植被构成资料, 通过将蓄积量、产量换算成叶生物量, 并应用Guenther提出的光温影响模型估算中国各植物的VOC排放量, 建立了中国天然源VOC排放清单, 并探讨了VOC的来源组分和时空分布规律。结果表明: 2003年中国植被VOC总排放量为12.83 Tg, 其中异戊二烯7.45 Tg (58%)、单萜烯2.23 Tg (17%)、其他VOC 3.14 Tg (25%); 不同植物的VOC排放量差异较大, 各类型植被排放贡献率为森林 (61%)>灌丛(27%)>农作物(7%)>草地(5%); 南部和东北地区为中国天然源VOC主要排放区域; 天然源VOC排放存在明显的季节变化, 夏季排放量最大; 不同龄级森林对VOC排放的贡献有所不同, 中龄林贡献最多。

关键词: 天然源挥发性有机物, 排放清单, 时空分布, 森林蓄积量