75年生アカマツ林の花粉生産速度

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  • 75ネンセイ アカマツリン ノ カフン セイサン ソクド

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Annual pollen production rates in a 75-year-old forest of Pinus densiflora SIEB. et ZUCC. (Japanese red pine) at Keihoku-cho, Kyoto Prefecture, were studied in 1981 and 1982. In 1982,those of understory trees of Pieris japonica THUNB. were also measured. The measurement of pollen production rates was made of flower-fall rates with 16 to 24 litter traps (0.5m×0.5m each) and dry weight or number of pollen grains contained in flowers sampled just before the anthers opened. Dry weights of pollen produced by overstory trees of Japanese red pine in 1981 and 1982 were 87 and 74kg ha^<-1>y^<-1>, respectively. Numbers of pollen grains produced by them were 4.9×(10)^<12> and 4.1×(10)^<12> no. ha^<-1>y^<-1>. The values of understory Pieris trees in 1982 were 11kg ha^<-1>y^<-1> and 1.3×(10)^<12> no. ha^<-1>y^<-1>. Production rates of male flowers of Japanese red pine before pollen release were summed up as 134 and 108kg ha^<-1>y^<-1>, of which about 67% was pollen. Understory Pieris trees produced 32% as many pollen grains as overstory Japanese red pine trees. The accuracy of measurement was not satisfactory, because the coefficients of variation among litter traps in annual flower-fall rates were about 0.7 for Japanese red pine and 1.4 for Pieris.

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