Oecologia

, Volume 141, Issue 3, pp 489–501

Carbon fluxes to the soil in a mature temperate forest assessed by 13C isotope tracing

Authors

  • Katharina Steinmann
    • Laboratory for Atmospheric Chemistry, Stable Isotopes and Ecosystem FluxesPaul Scherrer Institute
    • Botanisches Institut der Universität Basel
    • Laboratory for Atmospheric Chemistry, Stable Isotopes and Ecosystem FluxesPaul Scherrer Institute
  • Matthias Saurer
    • Laboratory for Atmospheric Chemistry, Stable Isotopes and Ecosystem FluxesPaul Scherrer Institute
  • Christian Körner
    • Botanisches Institut der Universität Basel
Ecosystem Ecology

DOI: 10.1007/s00442-004-1674-4

Cite this article as:
Steinmann, K., Siegwolf, R.T.W., Saurer, M. et al. Oecologia (2004) 141: 489. doi:10.1007/s00442-004-1674-4
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Abstract

Photosynthetic carbon uptake and respiratory C release from soil are major components of the global carbon balance. The use of 13C depleted CO213C = −30‰) in a free air CO2 enrichment experiment in a mature deciduous forest permitted us to trace the carbon transfer from tree crowns to the rhizosphere of 100–120 years old trees. During the first season of CO2 enrichment the CO2 released from soil originated substantially from concurrent assimilation. The small contribution of recent carbon in fine roots suggests a much slower fine root turnover than is often assumed.13C abundance in soil air correlated best with temperature data taken from 4 to 10 days before air sampling time and is thus rapidly available for root and rhizosphere respiration. The spatial variability of δ13C in soil air showed relationships to above ground tree types such as conifers versus broad-leaved trees. Considering the complexity and strong overlap of roots from different individuals in a forest, this finding opens an exciting new possibility of associating respiration with different species. What might be seen as signal noise does in fact contain valuable information on the spatial heterogeneity of tree-soil interaction.

Keywords

Soil respirationCarbon turnoverFunctional groupsStable isotopes

Copyright information

© Springer-Verlag 2004