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  Reconcilable differences: a joint calibration of fine-root turnover times with radiocarbon and minirhizotrons

Ahrens, B., Hansson, K., Solly, E., & Schrumpf, M. (2014). Reconcilable differences: a joint calibration of fine-root turnover times with radiocarbon and minirhizotrons. New Phytologist, 204(4), 932-942. doi:10.1111/nph.12979.

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Datensatz-Permalink: https://hdl.handle.net/11858/00-001M-0000-0019-DC9B-9 Versions-Permalink: https://hdl.handle.net/21.11116/0000-000A-99A3-1
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 Urheber:
Ahrens, Bernhard1, Autor           
Hansson, Karna, Autor
Solly, Emily2, 3, Autor           
Schrumpf, Marion1, 4, Autor           
Affiliations:
1Soil Processes, Dr. Marion Schrumpf, Department Biogeochemical Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1938308              
2Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497752              
3IMPRS International Max Planck Research School for Global Biogeochemical Cycles, Max Planck Institute for Biogeochemistry , Max Planck Society, Hans-Knöll-Str. 10, 07745 Jena, DE, ou_1497757              
4Soil and Ecosystem Processes, Dr. M. Schrumpf, Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497776              

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 Zusammenfassung: We used bomb-radiocarbon and raw minirhizotron lifetimes of fine-roots (<0.5 mm in diameter) in the organic layer of Norway spruce forests in southern Sweden to test if different models are able to reconcile the apparently contradicting turnover time estimates from both techniques.

• We present a framework based on survival functions that is able to jointly model bomb-radiocarbon and minirhizotron data. At the same time we integrate prior knowledge about biases of both techniques – the classification of dead roots in minirhizotrons and the use of carbon reserves to grow new roots.

• We found that two-pool models, either in parallel or in serial setting, were able to reconcile the bomb-radiocarbon and minirhizotron data. These models yielded a mean residence time of 3.80 ± 0.16 years (mean ± SD). On average 60 ± 2 % of fine-roots turned over within 0.75 ± 0.10 years, while the rest was turning over within 8.4 ± 0.2 years.

• Bomb-radiocarbon and minirhizotron data alone give a biased estimate of fine-root turnover. Both datasets are reconcilable. The two-pool models allow a mechanistic interpretation for the coexistence of fast and slowly cycling roots – branching and suberization for the serial-two-pool and ectomycorrhizal fungi-plant interactions for the parallel-two-pool model.

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 Datum: 20142014-09-072014-12
 Publikationsstatus: Erschienen
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 Identifikatoren: Anderer: BGC2068
DOI: 10.1111/nph.12979
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Titel: New Phytologist
  Andere : New Phytol.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: London : Academic Press.
Seiten: - Band / Heft: 204 (4) Artikelnummer: - Start- / Endseite: 932 - 942 Identifikator: ISSN: 0028-646X
CoNE: https://pure.mpg.de/cone/journals/resource/954925334695