Coordination between growth, phenology, and carbon storage in three coexisting deciduous tree species in a temperate forest
Tamir Klein, Yann Vitasse & Günter Hoch
| Résumé |
n deciduous trees growing in temperate forests, bud break and growth
in spring must rely on intrinsic carbon (C) reserves. Yet it is
unclear whether growth and C storage occur simultaneously, and
whether starch C in branches is suf cient for refoliation. To test
in situ the relationships between growth, phenology and C
utilization, we monitored stem growth, leaf phenology and stem and
branch nonstructural carbohydrate (NSC) dynamics in three deciduous
species: Carpinus betulus L., Fagus sylvatica L. and Quercus petraea
(Matt.) Liebl. To quantify the role of NSC in C investment into
growth, a C balance approach was applied. Across the three species,
>95% of branchlet starch was consumed during bud break, con rming
the importance of C reserves for refoliation in spring. The C
balance calculation showed that 90% of the C investment in foliage
(7.0–10.5 kg tree−1 and 5–17 times the C needed for annual
stem growth) was explained by simultaneous branchlet starch
degradation. Carbon reserves were recovered sooner than expected,
after leaf expansion, in parallel with stem growth. Carpinus had
earlier leaf phenology (by ∼25 days) but delayed cambial
growth (by ∼15 days) than Fagus and Quercus, the result of a
competitive strategy to ush early, while having lower NSC
levels. |
| Mots-clés |
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| Citation | Klein, T., Vitasse, Y., & Hoch, G. (2016). Coordination between growth, phenology, and carbon storage in three coexisting deciduous tree species in a temperate forest. Tree Physiology, in press, XX-XX. |
| Type | Article de périodique (Anglais) |
| Date de publication | 1-6-2016 |
| Nom du périodique | Tree Physiology |
| Volume | in press |
| Pages | XX-XX |