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

MPG-Autoren
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Ahrens,  Bernhard
Soil Processes, Dr. Marion Schrumpf, Department Biogeochemical Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Solly,  Emily
Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society;
IMPRS International Max Planck Research School for Global Biogeochemical Cycles, Max Planck Institute for Biogeochemistry , Max Planck Society;

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Schrumpf,  Marion
Soil Processes, Dr. Marion Schrumpf, Department Biogeochemical Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society;
Soil and Ecosystem Processes, Dr. M. Schrumpf, Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Zitation

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.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0019-DC9B-9
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.