我国植物VOCs排放速率的研究

Studies on the emission rates of plants VOCs in China

1992～2000年,使用流动式、封闭式采样法,气相色谱-火焰离子化检测器,测定了我国4种气候类型(温带-寒温带,温带,温带-亚热带,热带-亚热带),7个地区(黑龙江,北京,福建,广东,四川,湖南,云南),共58种当地优势树种、庄稼和草地异戊二烯和单萜烯的排放速率.使用G93算法,换算出相应异戊二烯和单萜烯的标准排放因子,并划分了这些排放因子的等级.同种树种在不同的气候带和季节的排放有明显的差异,通常,VOCs排放速率南方高于北方,夏季高于冬季;阔叶树主要排放异戊二烯,针叶树主要排放单萜烯,但是我国南方相当数量的阔叶林的排放特征不符合上述规律.

From 1992 to 2001, the emission rate of isoprene and monoterpenes in 58 kinds of local dominant tree, crop and grass, lands from frigid temperate to torrid zone of 4 climatic types (temperate-frigid temperate, temperate, temperate-subtropic and tropic-subtropic) including 7 regions (Heilongjiang, Beijing, Fujian, Guangdong, Sichuan, Hunan and Yunnan) in China, were determined using flow and enclosure sampling method and chromatogram-fire ion detector (GC-FID). The conversion of relevant standard emission factors of isoprene and monoterpene were made using G93 arithmetic technique, and the grade of these factors was classified. The plants of same kind in different climatic zones and seasons had great difference in emission. In general, the emission rates of VOC, in south were higher than in north, and in summer higher than in winter. Deciduous trees emitted mainly isoprene, and coniferous trees mainly monoterpenes; but the emission characters of considerable number of south deciduous trees were not in accordance to the rules mentioned above.