オオバヤシャブシ73年生林分の7年間の花粉生産

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  • Pollen production in a 73-year-old Alnus sieboldiana stand during a 7-year period
  • 学術資料 オオバヤシャブシ73年生林分の7年間の花粉生産
  • ガクジュツ シリョウ オオバヤシャブシ 73ネン セイリンブン ノ 7ネンカン ノ カフン セイサン

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The production rates of pollen, male catkins, female strobili and seed cones in a 73-year-old Alnus sieboldiana stand, planted for erosion control in Shigaraki, Shiga Prefecture, were studied in the period 1983-1989. These rates, in terms of number and dry weight on a land-area basis, were measured using ten litter raps. Male catkins from six or seven trees in the study stand were sampled on the convenient dates before pollen release. The number of bracts per catkin, number of stamens per bract, and number and dry weight of pollen grains per stamen were measured, and pollen yields per catkin were estimated by multiplying the mean values for the trees. Mean pollen quantities per catkin in 1984-1988 were 15.55-20.04 (mean, 18.23)×10^6 grains and 170.4-239.4 (mean, 193.9) mg. The dry weight of a single pollen grain, obtained by dividing the weight by the number of pollen grains per stamen, was 9.20-13.1(mean, 10.8)×10^<-6> mg. Pollen production rates, obtained by multiplying the pollen yield (by number and dry weight) per catkin by the number of open male catkins per ha, were estimated to be 17.04-45.87 (mean, 30.00)×10^<12> grains/ha and 222.8-488.1 (mean, 315.9) kg/ha. The mean numerical ratio of pollen grains to ovules (P/Ov ratio) for the seven study years was 120×10^3. The mean dry-matter production rate for male components was 649.8 kg/ha, and pollen allocation reached 48.6%. The investment of photosynthates in reproduction, or the mean dry-matter production rate for male plus female components, was 914.6 kg/ha, where pollen allocation reached 34.5%.

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