Biogeochemistry

, Volume 104, Issue 1–3, pp 227–236 | Cite as

Mean residence time of O horizon carbon along a climatic gradient in Scandinavia estimated by 14C measurements of archived soils

  • Mats Fröberg
  • Edward Tipping
  • Johan Stendahl
  • Nicholas Clarke
  • Charlotte Bryant
Article

Abstract

We used two datasets of 14C analyses of archived soil samples to study carbon turnover in O horizons from spruce dominated old-growth stands on well-drained podzols in Scandinavia. The main data set was obtained from archived samples from the National Forest Soil Inventory in Sweden and represents a climatic gradient in temperature. Composite samples from 1966, 1972, 1983 and 2000 from four different regions in a latitude gradient ranging from 57 to 67°N were analysed for 14C content. Along this gradient the C stock in the O horizon ranges from 2.1 kg m−2 in the north to 3.7 kg m−2 in the southwest. The other data set contains 14C analyses from 1986, 1987, 1991, 1996 and 2004 from the O horizons in Birkenes, Norway. Mean residence times (MRT) were calculated using a two compartment model, with a litter decomposition compartment using mass loss data from the literature for the three-first years of decomposition and a humus decomposition compartment with a fitted constant turnover rate. We hypothesized that the climatic gradient would result in different C turnover in different parts of the country between northern and southern Sweden. The use of archived soil samples was very valuable for constraining the MRT calculations, which showed that there were differences between the regions. Longest MRT was found in the northernmost region (41 years), with decreasing residence times through the middle (36 years) and central Sweden (28 years), then again increasing in the southwestern region (40 years). The size of the soil organic carbon (SOC) pool in the O horizon was mainly related to differences in litter input and to a lesser degree to MRT. Because N deposition leads both to larger litter input and to longer MRT, we suggest that N deposition contributes significantly to the latitudinal SOC gradient in Scandinavia, with approximately twice as much SOC in the O horizon in the south compared to the north. The data from Birkenes was in good agreement with the Swedish dataset with MRT estimated to 34 years.

Keywords

Forest soils Mean residence time Radiocarbon Soil organic carbon 

Notes

Acknowledgements

The Swedish Environmental Protection Agency is the main sponsor of the Swedish Forest Soil Inventory, which is administered by the Department of Soil and Environment, SLU. We also thank Wenche Aas (Norwegian Institute for Air Research) for providing temperature data for Birkenes, and the Nordic Forest Research Coordination Committee for funding of Birkenes data through the project ‘Climatic effects on pools of organic carbon and nitrogen and fluxes of dissolved carbon and nitrogen in forest soils’. Isotope measurements for Birkenes were made through NERC Radiocarbon Laboratory allocation 1063.0304 to ET.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Mats Fröberg
    • 1
  • Edward Tipping
    • 2
  • Johan Stendahl
    • 1
  • Nicholas Clarke
    • 3
  • Charlotte Bryant
    • 4
  1. 1.Department of Soil and EnvironmentSwedish University of Agricultural SciencesUppsalaSweden
  2. 2.Centre for Ecology and HydrologyLancaster Environmental CentreLancasterUK
  3. 3.Norwegian Forest and Landscape InstituteÅsNorway
  4. 4.NERC Radiocarbon Facility (Environment)GlasgowScotland, UK

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