Study on Isoprene Emission from Popular Plants in Taiwan
Date Issued
2004
Date
2004
Author(s)
Lee, Kun-Lung
DOI
zh-TW
Abstract
The aim of this research was to detect isoprene emission from common plants in Taiwan by simplified isoprene sampling and analyzing method. A PP plastic bag enclosure method in combination with a GC-FID instrument installed with a Se-30 packing column was adopted in this study to quickly detect the plant gas emission. Totally 41 plant species are screened for their emission. Among them, nine species were found to be isoprene emitters. They are, white bark fig（Ficus benjamina）, rubber plant（Ficus elastica）, bread fruit tree（Artocarpus altilis）, Formosan sweet gum (Liquidambar formosana), poongaoil (Pongamia pinnata), sisso tree (Dalbergia sissoo), paper-bark tree (Melaleuca leucadendron), wax apple (Syzygium samarangense), and mango (Mangifera indica). The nine plant species are not suggested to be planted in the urban areas. They may emit a lot of biogenic volatile organic compounds that will increase the ambient ozone.
Isoprene emission rate was also measured for rubber plant, sisso tree and Formosan sweet gum. Their emission rates in the ecosystem tank under high density of 6,300 lux were 12, 15, and 32 ug/g/h.
The effect of different light on isoprene emission is also studied in the ecosystem tank. Results show that all 4 colors of light including red, yellow, green and blue, can cause isoprene emission on Formosan sweet gum and sisso tree, but the efficiencies are different. The emission rates are ranked by: red＞blue＞yellow＞green. No isoprene is emitted from red cedar（Bischofia javanica）no matter what color of light is used. The reason of different light’s effect seems to be associated with photosynthesis. Since red and blue light is more essential for photosynthesis, they can induce more isoprene production and emission.
The ambient isoprene concentration behind the high emission plants was also measured. Results show that none was detectable at 0, 1, and 3 meters downwind the nine isoprene emitters. These results suggest that isoprene concentration is not as high as ethylene in Taipei area.
Key words：biogenic volatile organic compound, isoprene
Subjects
生物源揮發性有機物
異戊二烯
biogenic volatile organic compound
isoprene
Type
other