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Carbon fluxes to the soil in a mature temperate forest assessed by C-13 isotope tracing
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 53020
Author(s) Steinmann, KTW; Siegwolf, R; Saurer, M; Korner, C
Author(s) at UniBasel Körner, Christian
Year 2004
Title Carbon fluxes to the soil in a mature temperate forest assessed by C-13 isotope tracing
Journal Oecologia
Volume 141
Number 3
Pages / Article-Number 489-501
Keywords soil respiration, carbon turnover, functional groups, stable isotopes
Abstract Photosynthetic carbon uptake and respiratory C release from soil are major components of the global carbon balance. The use of C-13 depleted CO2 (delta(13)C = -30 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. C-13 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 delta(13)C 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.
Publisher Springer
ISSN/ISBN 0029-8549
edoc-URL http://edoc.unibas.ch/dok/A5249081
Full Text on edoc No
Digital Object Identifier DOI 10.1007/s00442-004-1674-4
ISI-Number WOS:000224557300014
Document type (ISI) Article
 
   

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