期刊
NEW PHYTOLOGIST
卷 171, 期 4, 页码 793-804出版社
WILEY
DOI: 10.1111/j.1469-8137.2006.01780.x
关键词
dendrochemistry; isotope dendroclimatology; autocorrelation; Larix cajanderi; carbon allocation; tree rings; starch; Siberia
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 (CO2)-C-13. 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.
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