Abstract
To estimate the net rate of translocation in leaves of a larch stand, a new approach based on the summation method was proposed and given by a compartment model. The difference between the rate of translocation into and out of leaf biomass, namely, the net translocation rate (ΔT r /Δt), was usually expressed by the difference between the growth rate of leaf biomass and the surplus production rate provided that the rate of leaf loss due to leaffall and grazing can be considered negligible. The rate, ΔT r /Δt in a 19-yr-old larch stand, showed characteristic changes; it was positive from early April to late May, but after that it was negative until leaffall in late October. Our results confirmed that for the growth phase of positive ΔT r /Δt translocation of assimilate stored in non-photosynthetic organs was indispensable for the growth. To quantify this, the ratio of ΔT r /Δt to growth rate of leaf biomass was proposed.
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Hozumi, K., Kurachi, N. Estimation of seasonal changes in translocation rates in leaves of a Japanese larch stand. Bot Mag Tokyo 104, 25–36 (1991). https://doi.org/10.1007/BF02493401
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DOI: https://doi.org/10.1007/BF02493401