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Upscaling of methane exchange in a boreal forest using soil chamber measurements and high-resolution LiDAR elevation data

Author:
  • Elin Sundqvist
  • Andreas Persson
  • Natascha Kljun
  • Patrik Vestin
  • L. Chasmer
  • C. Hopkinson
  • Anders Lindroth
Publishing year: 2015
Language: English
Pages: 393-401
Publication/Series: Agricultural and Forest Meteorology
Volume: 214
Document type: Journal article
Publisher: Elsevier

Abstract english

Forest soils are generally considered to be net sinks of methane (CH4), but CH4 fluxes vary spatially depending on soil conditions. Measuring CH4 exchange with chambers, which are commonly used for this purpose, might not result in representative fluxes at site scale. Appropriate methods for upscaling CH4 fluxes from point measurements to site scale are therefore needed. At the boreal forest research site, Norunda, chamber measurements of soils and vegetation indicate that the site is a net sink of CH4, while tower gradient measurements indicate that the site is a net source of CH4. We investigated the discrepancy between chamber and tower gradient measurements by upscaling soil CH4 exchange to a 100 ha area based on an empirical model derived from chamber measurements of CH4 exchange and measurements of soil moisture, soil temperature and water table depth. A digital elevation model (DEM) derived from high-resolution airborne Light Detection and Ranging (LiDAR) data was used to generate gridded water table depth and soil moisture data of the study area as input data for the upscaling. Despite the simplistic approach, modeled fluxes were significantly correlated to four out of five chambers with R>0.68. The upscaling resulted in a net soil sink of CH4 of -10 mu mol m(-2) h(-1), averaged over the entire study area and time period June-September, 2010). Our findings suggest that additional contributions from CH4 soil sources outside the upscaling study area and possibly CH4 emissions from vegetation could explain the net emissions measured by tower gradient measurements. (C) 2015 Elsevier B.V. All rights reserved.

Keywords

  • Climate Research
  • Meteorology and Atmospheric Sciences
  • Methane consumption
  • Soil temperature
  • moisture
  • Soil
  • Topographic wetness index
  • Water table depth
  • Methane (CH4) fluxes

Other

Published
  • ISSN: 1873-2240
E-mail: andreas [dot] persson [at] nateko [dot] lu [dot] se

Senior lecturer

Dept of Physical Geography and Ecosystem Science

+46 46 222 42 62

GIS-centrum 103

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Senior lecturer

Centre for Geographical Information Systems (GIS Centre)

+46 46 222 42 62

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Teaching staff

Dept of Physical Geography and Ecosystem Science

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Department of Physical Geography and Ecosystem Science
Lund University
Sölvegatan 12
S-223 62 Lund
Sweden

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