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Volume 6, issue 7
Biogeosciences, 6, 1311–1324, 2009
https://doi.org/10.5194/bg-6-1311-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Biogeosciences, 6, 1311–1324, 2009
https://doi.org/10.5194/bg-6-1311-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Jul 2009

30 Jul 2009

Soil, plant, and transport influences on methane in a subalpine forest under high ultraviolet irradiance

D. R. Bowling1, J. B. Miller2,3, M. E. Rhodes2, S. P. Burns4,5, R. K. Monson3,5, and D. Baer6 D. R. Bowling et al.
  • 1Department of Biology, 257 South 1400 East, University of Utah, Salt Lake City, UT, 84112-0840, USA
  • 2National Oceanic and Atmospheric Administration, Earth System Research Laboratory, Boulder, CO, 80305, USA
  • 3Cooperative Institute for Research in Environmental Science, University of Colorado, Boulder, CO, 80309, USA
  • 4National Center for Atmospheric Research, Boulder, CO, 80305, USA
  • 5Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO, 80309, USA
  • 6Los Gatos Research, Mountain View, CA, 94041, USA

Abstract. Recent studies have demonstrated direct methane emission from plant foliage under aerobic conditions, particularly under high ultraviolet (UV) irradiance. We examined the potential importance of this phenomenon in a high-elevation conifer forest using micrometeorological techniques. Vertical profiles of methane and carbon dioxide in forest air were monitored every 2 h for 6 weeks in summer 2007. Day to day variability in above-canopy CH4 was high, with observed values in the range 1790 to 1910 nmol mol−1. High CH4 was correlated with high carbon monoxide and related to wind direction, consistent with pollutant transport from an urban area by a well-studied mountain-plain wind system. Soils were moderately dry during the study. Vertical gradients of CH4 were small but detectable day and night, both near the ground and within the vegetation canopy. Gradients near the ground were consistent with the forest soil being a net CH4 sink. Using scalar similarity with CO2, the magnitude of the summer soil CH4 sink was estimated at ~1.7 mg CH4 m−2 h−1, which is similar to other temperate forest upland soils. The high-elevation forest was naturally exposed to high UV irradiance under clear sky conditions, with observed peak UVB irradiance >2 W m−2. Gradients and means of CO2 within the canopy under daytime conditions showed net uptake of CO2 due to photosynthetic drawdown as expected. No evidence was found for a significant foliar CH4 source in the vegetation canopy, even under high UV conditions. While the possibility of a weak foliar source cannot be excluded given the observed soil sink, overall this subalpine forest was a net sink for atmospheric methane during the growing season.

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