9:30 AM - 9:45 AM
[ACG22-03] Estimation of carbon translocation and allocation in Siberian larch saplings at Mongolian forest using 13C pulse-labeling experiment
Keywords:Mongolia, Larch tree, 13C pulse-labeling, Carbon allocation
Thus, we conducted 13C pulse-labeling experiment using larch tree saplings in 2014 summer at KT site (47.7N, 107.6E) to estimate carbon allocation in trees and physiological response to environmental change in this region. Larch tree saplings were labeled by 13CO2 in the middle of June and the beginning of August. The labeled trees were sampled for the period from 1 week to 1 year to investigate carbon allocation in tree body.
Most of the 13C assimilated in the middle of June was kept in the needles until just before defoliation, and the carbon allocation to other tree parts (e.g. branches, stem and roots) was small. Assimilated 13C in the beginning of August rapidly translocated from needles to other parts, and the carbon allocation to the roots was large compared to 13C assimilated in June. The result probably indicates carbon accumulation in autumn for growth in the following year. Our results also showed a possibility that 13C fixed in August preferentially allocated from storage pools to needles for growth of new shoots in the following spring compared to 13C assimilated in June.