高野山コウヤマキ林の11年間の花粉生産

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Production rates of pollen, male flowers, seeds and seed cones in a mature Sciadopitys verticillata forest in Koyasan, Wakayama Prefecture, were studied in the period 1991-2001. These rates, in terms of number and dry weight on a land-area basis, were measured using 20 litter traps, each 50×50cm in the trap mouth area. Mean pollen yields per male flower cluster (inflorescence) were estimated to be 40.4×10^6 grains and 0.466g. The dry weight of a single pollen grain, obtained by dividing the weight by the number of pollen grains, was 12×10^<-6>mg. Pollen production rates, obtained by multiplying the pollen yield (in terms of number and dry weight) per male flower cluster by the number of open male flower clusters per ha, were estimated to be 2.9-60.8 (mean, 35.7)×10^<12> grains/ha and 34-702 (mean, 412)kg/ha. The annual fluctuation of pollen production rates during 11 consecutive years, represented as the ratio of the maximum rate relative to the minimum, was 21. The mean numerical ratio of pollen grains to ovules (P/Ov ratio) for the 11 study years was 3.5-4.5×10^6, obtained from the estimates of 290-373 ovules per seed cone. That of pollen grains to seeds (P/S ratio) was 6.0×10^6. The dry-matter production rates of male components were 50-1, 192 (mean, 679)kg/ha, and pollen allocations reached 54.5%-66.9% (mean, 60.7%). The investment of photosynthates in reproduction or the mean drymatter production rate for male plus female components was 1, 087kg/ha on average, of which pollen allocation reached 37.6%.
2007-12-31

高野山コウヤマキ林の11年間の花粉生産

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