4.5 Article

Applicability of the soil gradient method for estimating soil-atmosphere CO2, CH4, and N2O fluxes for steppe soils in Inner Mongolia

Journal

JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE
Volume 174, Issue 3, Pages 359-372

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/jpln.201000150

Keywords

GHG exchange; diffusion; gas-concentration gradient; grassland

Funding

  1. German Research Foundation (DFG) [536]
  2. National Natural Science Foundation of China [40805061, 40425010]
  3. Academy of Finland [130984]
  4. Helmholtz
  5. Academy of Finland (AKA) [130984, 130984] Funding Source: Academy of Finland (AKA)

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For evaluating the applicability of the soil gradient method as a substitute for CO2-, CH4-, and N2O-flux measurements in steppe, we carried out chamber measurements and determined soil gas concentration at an ungrazed (UG99) and a grazed (WG) site in Inner Mongolia, China. The agreement of the concentration-based flux estimates with measured chamber-based fluxes varied largely depending on the respective GHG in the sequence CO2 > CH4 >> N2O. A calibration of the gas-transport parameter used to calculate fluxes based on soil gas concentrations improved the results considerably for CO2 and CH4. After calibration, the average deviation from the chamber-based annual cumulative flux for both sites was 11.5%, 10.5%, and 59% for CO2, CH4, and N2O. The gradient method did not constitute an adequate stand-alone substitute for greenhouse-gas flux estimation since a calibration using chamber-based measurements was necessary and vigorous production processes were confined to the uppermost, almost watersaturated soil layer.

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