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

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