title: Isoprene emission from tropical trees in Okinawa Island, Japan.
abstract: This study surveyed isoprene emission from 42 indigenous and exotic tropical trees in subtropic Okinawa, Japan. Of the 42 trees studied, 4 emitted isoprene at a rate in excess of 20 microg g(-1)h(-1), and 28 showed the rates of 1-10 microg g(-1)h(-1). The remainder emitted less than 1 microg g(-1)h(-1). The majority of trees in this study may therefore fall within the lower emitting species. However, species in Moraceae that is indigenous in Okinawa emitted isoprene at relatively higher rates with an average of 14.2 microg g(-1)h(-1). The highest emission rate of 107.1 microg g(-1)h(-1) for Ficus virgata yielded the area basis rate of 47.4 nmol m(-2)s(-1), which is almost equivalent to the rate of high emitting species. Furthermore, a linear relationship between light intensity and isoprene emission was noted with Ficus virgata up to 1700 micromol m(-2)s(-1). These findings may show the potential importance of subtropical areas as sources of isoprene to the atmosphere.
authors.affiliation: United Graduate School of Agricultural Sciences, Kagoshima University, 1-21-24, Korimoto, Kagoshima 890-0065, Japan.
authors.forename: Parlindungan
authors.initials: P
authors.lastname: Tambunan
authors.forename: Shigeyuki
authors.initials: S
authors.lastname: Baba
authors.forename: Ayako
authors.initials: A
authors.lastname: Kuniyoshi
authors.forename: Hironori
authors.initials: H
authors.lastname: Iwasaki
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakamura
authors.forename: Hideo
authors.initials: H
authors.lastname: Yamasaki
authors.forename: Hirosuke
authors.initials: H
authors.lastname: Oku
mesh_terms: D002070:Butadienes / Q000378:metabolism*; D030681:Ficus / Q000378:metabolism*; D005453:Fluorescence; D045782:Hemiterpenes / Q000378:metabolism*; D007564:Japan; D010420:Pentanes / Q000378:metabolism*; D013045:Species Specificity
chemical_list: D002070:Butadienes; D045782:Hemiterpenes; D010420:Pentanes; C005059:isoprene