Biotic and abiotic controls on biogenic volatile organic compound fluxes from a subalpine forest floor

Christopher M. Gray, Russell Monson, Noah Fierer

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Nonmethane biogenic volatile organic compounds (BVOCs) play key roles in the atmosphere, where they can influence a wide range of chemical processes, and in soils, where they can alter the rates of biogeochemical cycles and impact the growth of plants and soil organisms. However, the diversity and quantities of BVOCs released from or taken up by soils remain poorly characterized as do the biotic and abiotic controls on these fluxes. Here we used proton transfer reaction mass spectrometry to quantify BVOC flux rates from soils with and without active root systems in a subalpine coniferous forest. The total measured BVOC flux averaged 102 nmol m-2 h-1 (an estimated 2.0 μg-C m-2 h-1). The individual BVOCs with the highest net emissions from soil included monoterpenes and methanol (averaging 646 and 641 ng-C m-2 h-1, respectively) while soil represented a net sink of isoprene (-98 ng-C m-2 h-1) and formaldehyde (-37 ng-C m-2 h-1). Tree roots, directly or indirectly, contributed an average of 53% of the total carbon emitted from the soil as BVOCs, with methanol and acetaldehyde among those BVOCs most strongly associated with active root presence. The fluxes of most of the dominant BVOCs emitted from soil, including methanol, increased linearly with increasing temperature. Together the fluxes of certain BVOCs into or out of the forest floor (particularly methanol, isoprene, and monoterpenes) are likely relevant to ecosystem-level processes and belowground ecology, but these fluxes are highly variable and are strongly controlled by both root presence and soil abiotic conditions. Key Points Emission rates from the soil were highest for methanol and monoterpenes Uptake rates into the soil were highest for isoprene and formaldehyde Root presence and temperature correlated with BVOC flux rates

Original languageEnglish (US)
Pages (from-to)547-556
Number of pages10
JournalJournal of Geophysical Research: Space Physics
Volume119
Issue number4
DOIs
StatePublished - 2014

Fingerprint

Volatile Organic Compounds
subalpine forests
volatile organic compounds
forest floor
forest litter
volatile organic compound
soils
Fluxes
Soils
methanol
soil
Methanol
methyl alcohol
monoterpene
isoprene
Monoterpenes
monoterpenoids
formaldehyde
flux (rate)
Formaldehyde

Keywords

  • BVOC
  • isoprene
  • methanol
  • monoterpene
  • PTR-MS
  • soil VOCs

ASJC Scopus subject areas

  • Soil Science
  • Forestry
  • Water Science and Technology
  • Palaeontology
  • Atmospheric Science
  • Aquatic Science
  • Ecology

Cite this

Biotic and abiotic controls on biogenic volatile organic compound fluxes from a subalpine forest floor. / Gray, Christopher M.; Monson, Russell; Fierer, Noah.

In: Journal of Geophysical Research: Space Physics, Vol. 119, No. 4, 2014, p. 547-556.

Research output: Contribution to journalArticle

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