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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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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0019-DC9B-9 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-002C-899A-8
Genre: Journal Article

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http://onlinelibrary.wiley.com/wol1/doi/10.1111/nph.12979/abstract (Publisher version)
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 Creators:
Ahrens, Bernhard1, Author           
Hansson, Karna, Author
Solly, Emily2, 3, Author           
Schrumpf, Marion1, 4, Author           
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, 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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 Abstract: 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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 Dates: 20142014-09-072014-12
 Publication Status: Issued
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 Identifiers: Other: BGC2068
DOI: 10.1111/nph.12979
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Title: New Phytologist
  Other : New Phytol.
Source Genre: Journal
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Publ. Info: London : Academic Press.
Pages: - Volume / Issue: 204 (4) Sequence Number: - Start / End Page: 932 - 942 Identifier: ISSN: 0028-646X
CoNE: https://pure.mpg.de/cone/journals/resource/954925334695