摘要
采用封闭式气袋采样和气相色谱法,对杨树排放碳氢化合物(HCs)的情况进行了调查.结果发现,与油松排放情况不同, 杨树主要排放异戊二烯,约占其HCs排放总量的95%以上,且与温度、光强正相关. 排放的日变化表明,杨树在正午有一排放高峰, 夜间基本不排放.在春季和夏季日均气温分别为19.2℃和28.8℃时,杨树的异戊二烯平均总排放速率分别为4.4和39.8μg/g·h.
The emission of isoprene and terpenes from popular tree in Beijing were investigated using enclosure sampling technique and GC-FID analysis. The terpenes identified and quantified were a-and β-pinene,carene,flr-terpinene,limonene,and ocinene with isoprene accounting for over 95% of the total hydrocarbons emission. The emission rate increases with irradiation and temperature. The diurnal variation of emission were established which had one peak value during noon,no emissions were found at night for popular tree. The mean emission rate of isoprene from it were about 4. 4μg/g ·h in spring and 39. 8μg/g · h in summer.
出处
《环境化学》
CAS
CSCD
北大核心
1995年第2期118-123,共6页
Environmental Chemistry
基金
国家自然科学基金资助项目
