城市与山地森林地区夏秋季大气CO_2浓度变化初探

CHANGES IN ATMOSPHERIC CO 2 OF URBAN AND MOUNTAIN FOREST AREAS DURING THE SUMMER AND AUTUMN SEASONS

城市与山地森林地区夏秋季大气ＣＯ２浓度变化初探蒋高明黄银晓韩兴国（中国科学院植物研究所，北京１０００９３）关键词ＣＯ２浓度；城市；森林；北京市．１引言ＣＯ２等温室气体的增加，引起了全球科学家与政治家的关注，温室效应及其带来的一系列生态环境改变即全球...

The CO 2 concentrations and their changes during the summer and autumn seasons in the urban area of Beijing and those in the forest area of Xiaolongment Forest, Mentougou district, 114km southwest from Beijing downtown area were comparatively studied. During the summer and autumn, the CO 2 concentrations in the urban area changed from 328 to 475μmol·mol -1 , with an average value of 380±19μmol·mol -1 .The atmospheric CO 2 of the forest area during the summer time, when plants were growing luxuriantly,was 327±4μmol·mol -1 , lower than that in autumn. During a sunny summer day, CO 2 was highest in the morning at 6:00am, then decreased when photosynthesis in the forest took place and reached the lowest level around 2:00pm. Large difference in CO 2 concentration, as much as 40μmol·mol -1 was recorded. The CO 2 concentration in the urban areas was 53μmol·mol -1 higher than that in the forest area, and 30μmol·mol -1 higher than the blobal mean of 350μmol·mol -1 . The seasonal and hourly changes were not conspicuous in the urban area compared with the forest area, indicating the CO 2 level was strongly interred by urbanization and industrialization.