Probability distributions of nonstructural carbon ages and transit times provide insights into carbon allocation dynamics of mature trees

2020 | journal article. A publication with affiliation to the University of Göttingen.

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​Probability distributions of nonstructural carbon ages and transit times provide insights into carbon allocation dynamics of mature trees​
Herrera‐Ramírez, D.; Muhr, J.; Hartmann, H. ; Römermann, C.; Trumbore, S. & Sierra, C. A.​ (2020) 
New Phytologist226(5) pp. 1299​-1311​.​ DOI: https://doi.org/10.1111/nph.16461 

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Authors
Herrera‐Ramírez, David; Muhr, Jan; Hartmann, Henrik ; Römermann, Christine; Trumbore, Susan; Sierra, Carlos A.
Abstract
Summary ●In trees, the use of nonstructural carbon (NSC) under limiting conditions impacts the age structure of the NSC pools. We compared model predictions of NSC ages and transit times for Pinus halepensis, Acer rubrum and Pinus taeda, to understand differences in carbon (C) storage dynamics in species with different leaf phenology and growth environments. ●We used two C allocation models from the literature to estimate the NSC age and transit time distributions, to simulate C limitation, and to evaluate the sensitivity of the mean ages to changes in allocation fluxes. ●Differences in allocation resulted in different NSC age and transit time distributions. The simulated starvation flattened the NSC age distribution and increased the mean NSC transit time, which can be used to estimate the age of the NSC available and the time it would take to exhaust the reserves. Mean NSC ages and transit times were sensitive to C fluxes in roots and allocation of C from wood storage. ●Our results demonstrate how trees with different storage traits are expected to react differently to starvation. They also provide a probabilistic explanation for the ‘last‐in, first‐out’ pattern of NSC mobilization from well‐mixed C pools.
Issue Date
2020
Journal
New Phytologist 
ISSN
0028-646X
eISSN
1469-8137
ISSN
0028-646X
eISSN
1469-8137
Language
English
Sponsor
German Israeli Fund
German Research Foundation
German Centre for Integrative Biodiversity Research (iDiv) Halle‐Jena‐Leipzig

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