Seasonal course of translocation, storage and remobilization of 13C pulse-labeled photoassimilate in naturally growing Larix gmelinii saplings
Article first published online: 5 JUN 2006
Volume 171, Issue 4, pages 793–804, September 2006
How to Cite
Kagawa, A., Sugimoto, A. and Maximov, T. C. (2006), Seasonal course of translocation, storage and remobilization of 13C pulse-labeled photoassimilate in naturally growing Larix gmelinii saplings. New Phytologist, 171: 793–804. doi: 10.1111/j.1469-8137.2006.01780.x
- Issue published online: 16 JUN 2006
- Article first published online: 5 JUN 2006
- Received: 24 January 2006 Accepted: 7 April 2006
- isotope dendroclimatology;
- Larix cajanderi;
- carbon allocation;
- tree rings;
- • Autocorrelation – correlation of tree-ring parameters such as ring width, density and isotope ratios to the environmental conditions of the previous year(s) – is associated with the use of previous photoassimilate for current year's tree ring formation.
- • To clarify the seasonal course of carbon allocation patterns among needles, branches, stem and roots, we pulse-labeled 10 Larix gmelinii growing in a continuous permafrost zone with 13CO2.
- • Photoassimilate incorporated in June was allocated mainly to above-ground parts, indicating active above-ground growth in spring. Very little was allocated to below-ground parts (2.6–7.9%), probably because root growth is inhibited by low soil temperatures in spring. Conversely, a higher proportion of July and August photoassimilate was allocated to below-ground parts (32–44 and 12–24%, respectively).
- • About half the carbon in new needles was derived from stored material. The starch pool in non-needle parts, which can be used for xylem formation, drew approx. 43% of its carbon from the previous year's photoassimilate, indicating that carbon storage is a key mechanism behind autocorrelation in (isotope) dendroclimatology.