香川県小豆島のウバメガシ林における花粉生産

概要

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The annual pollen production rates of a Quercus phillyraeoides stand on Shodoshima Island, Seto Inland Sea, Kagawa Prefecture were measured. Pollen production rates were determined on a land-area basis from the number of male catkins that opened in the study stand and the mean number and dry weight of pollen grains contained in male catkins before flowering. The mean numbers of pollen grains per stamen, per flower and per catkin for 5 sampled trees were 8,560, 36.7×10^3 and 734×10^3, respectively, and the corresponding mean pollen weights were 0.0529mg, 0.224mg and 4.42mg, respectively. Mean weight of a single pollen grain was calculated to be 6.2×10^<-6>mg. The yield of open catkins per hectare of the study stand in 1995-1967, measured with 6 litter traps, was 31.51〜63.97×10^6 /ha/yr. Therefore, the production rates of pollen grains in the study stand in terms of grain number and weight were estimated to be 23.1〜47.0×10^<12> /ha/yr and 139〜283kg/ha/yr, respectively. Annual fluctuation of the pollen yield during 3 years was small, as the ratio of the maximum to minimum value was 2.0. Dry-matter pollen allocation for male components was 41.2%-45.1%, and that for male plus female components was 12.3%-21.8%. The numerical ratios of pollen grains to ovules in the stand were 930×10^3 in 1995 and 540×10^3 in 1996.
日本花粉学会の論文
2006-06-30