Boreal pine forest floor biogenic volatile organic compound emissions peak in early summer and autumn.

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外文摘要：In boreal forests, canopy-scale emissions of biogenic volatile organic compounds (BVOCs) are rather well characterised, but knowledge of ecosystem-scale BVOC emissions is still inadequate. We used adsorbent tubes to measure BVOCs from a boreal Scots pine (Pinus sylvestris L.) forest floor in southern Finland and analysed the compounds with a gas chromatograph-mass spectrometer. The most abundant compound group was the monoterpenes (averaging 5.04 micro g m-2 h-1), in which alpha -pinene, Delta 3-carene and camphene contributed over 90% of the emissions. Emissions of other terpenoids (isoprene and sesquiterpenes) were low (averaging 0.05 and 0.04 micro g m-2 h-1, respectively). BVOC emissions from the forest floor varied seasonally, peaking in early summer and autumn, with most of the compounds following similar patterns. The emission pattern was sustained throughout the measurement period, suggesting that the main sources of the emissions remained more or less stable. We compared the BVOC fluxes with environmental parameters such as temperature, precipitation and PAR, and with fluxes of other trace gases (CO2, CH4, N2O), as well as with ground vegetation photosynthesis and with litter input. Several of these parameters were correlated with the presence of BVOCs. The sources of soil BVOC emissions are very poorly understood, but our results suggest, that changes in litter quantity and quality, soil microbial activity and the physiological stages of plants are linked with changes in BVOC fluxes.

外文关键词：

alpha-pineneboreal forestscamphenecarbon dioxideconiferous forestsforest litterforestsgasesground vegetationmeasurementmeteorologymicroorganismsmonoterpenesmonoterpenoidsorganic compoundsphotosynthesisphytochemicalspinessesquiterpenoidssoilsoil floraterpenoidsvolatile compoundsPinusPinus sylvestrisplantsDeveloped CountriesEuropean Union CountriesOECD CountriesScandinaviaNorthern EuropeEuropePinaceaePinopsidagymnospermsSpermatophytaplantseukaryotesPinus.

作者：

Aaltonen, H.、Pumpanen, J.、Hakola, H.、Hellen, H.、Kulmala, L.、Vesala, T.、Back, J.、Pihlatie, M.

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作者单位：

Department of Forest Sciences, P.O. Box 27, FI-00014 University of Helsinki, Helsinki, Finland

Department of Forest Sciences, P.O. Box 27, FI-00014 University of Helsinki, Finland

Finnish Meteorological Institute, P.O. Box 503, FI-00101 Helsinki, Finland

Department of Physics, P.O. Box 48, FI-00014 University of Helsinki, Finland

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出版年：

2011

DOI：

doi:10.1016/j.agrformet.2010.12.010

Agricultural and Forest Meteorology

ISTP

ISSN：0168-1923

年,卷(期)：2011.151(6)