わかいアカマツ林の花粉生産速度

概要

論文の詳細を見る
SAITO, Hideki & TAKEOKA, Masaji (Dept. For., Fac. Agr., Kyoto Pref. Univ., Kyoto). 1985. Pollen production rates in a young Japanese red pine forest. Jap. J. Ecol., 35 : 67-76. Annual pollen production rates were studied in a 35-year-old forest of Japanese red pine (Pinus densiflora) near Kyoto, Japan. Male flowers sampled just before the anthers opened contained 3.17 mg of pollen, corresponding to 60% of dry weight of male flowers with pollen, and 2.45×10^5 pollen grains. There was no difference between the pollen amounts in unproductive and productive years for male flowers. From the dry weight or number of pollen per male flower and the annual fall rates of make flowers per hectare, which were measured with litter traps, annual pollen production rates during the years 1979-1983 were found to range from 55 kg ha^<-1>y^<-1> to 96 kg ha^<-1>y^<-1> (mean ; 79 kg ha^<-1>y^<-1>), and from 4.4×10^<12> no. ha^<-1>y^<-1> to 7.6×10^<12> no. ha^<-1>y^<-1> (mean ; 6.2×10^<12> no. ha^<-1>y^<-1>). The ratio of the maximum to minimum annual production rates was 1.8,which was one-eighth of the ratio of Chamaecyparis plantations studied by us. The maximum production rate in the study forest was estimated to be 100 kg ha^<-1>y^<-1> in dry weight and 8×10^<12> no. ha^<-1>y^<-1> in number, corresponding to 50% and 22% of that of Chamaecyparis plantations, respectively.
日本生態学会の論文
1985-03-30