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The seasonal changes of photosynthesis of cones of Japanese larch (Larix kaempferi Carr.) trees showed that gross photosynthetic rate of young cones (PG) was 2–3 µmol m−2 s−1 at surface area unit and PG/RD (dark respiration of cones) peaked about 0.7 in the same period, indicating that 70 % of respiratory CO2 was re-fixed. With maturation, PG and PG/RD sharply decreased. Chlorophyll content...
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