title: Determination of de novo and pool emissions of terpenes from four common boreal/alpine trees by 13CO2 labelling and PTR-MS analysis.
abstract: Boreal forests emit a large amount of monoterpenes into the atmosphere. Traditionally these emissions are assumed to originate as evaporation from large storage pools. Thus, their diurnal cycle would depend mostly on temperature. However, there is indication that a significant part of the monoterpene emission would originate directly from de novo synthesis. By applying 13CO2 fumigation and analyzing the isotope fractions with proton transfer reaction mass spectrometry (PTR-MS) and classical GC-MS, we determined the fractions of monoterpene emissions originating from de novo biosynthesis in Pinus sylvestris (58%), Picea abies (33.5%), Larix decidua (9.8%) and Betula pendula (100%). Application of the observed split between de novo and pool emissions from P. sylvestris in a hybrid emission algorithm resulted in a better description of ecosystem scale monoterpene emissions from a boreal Scots pine forest stand.
authors.affiliation: Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research (IMK-IFU), Kreuzeckbahnstrasse 19, 82467 Garmisch-Partenkirchen, Germany.
authors.forename: Andrea
authors.initials: A
authors.lastname: Ghirardo
authors.forename: Kristine
authors.initials: K
authors.lastname: Koch
authors.forename: Risto
authors.initials: R
authors.lastname: Taipale
authors.forename: Ina
authors.initials: I
authors.lastname: Zimmer
authors.forename: Jörg-Peter
authors.initials: JP
authors.lastname: Schnitzler
authors.forename: Janne
authors.initials: J
authors.lastname: Rinne
mesh_terms: D029662:Betula / Q000737:chemistry; D002070:Butadienes / Q000032:analysis*; D002245:Carbon Dioxide / Q000032:analysis; D002247:Carbon Isotopes / Q000032:analysis; D017753:Ecosystem; D008401:Gas Chromatography-Mass Spectrometry; D045782:Hemiterpenes / Q000032:analysis*; D028221:Larix / Q000737:chemistry; D013058:Mass Spectrometry / Q000379:methods; D008956:Models, Chemical; D039821:Monoterpenes / Q000032:analysis*; D010420:Pentanes / Q000032:analysis*; D028223:Pinus / Q000737:chemistry; D041605:Pinus sylvestris / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry; D014197:Trees / Q000737:chemistry*
chemical_list: D002070:Butadienes; D002247:Carbon Isotopes; D045782:Hemiterpenes; D039821:Monoterpenes; D010420:Pentanes; C005059:isoprene; D002245:Carbon Dioxide