クヌギ林における花粉の生産と飛散に関する研究

概要

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Pollen prlduction rates and pollen dispersal were investigated in 40〜50 years old natural stands and 10〜13 years old seed orchards of Quercus acutissima. Pollen production rate sin stands were estimated from the dry weight of male catkins which fell to the ground after pollen dispersal. The amount of pollen dispersal was estimated by measuring with a microscope the pollen grains adhering to slide glass set in pollen traps. The results obtained in this study are as follows: One male catkins contained about five hundred thousand pollen grains. The percentage of pollen dry weight to the weight of male catkins after pollen dispersal was about 60% on average. Pollen production rates in stands differed markedly according to stands and years and years. It was estimated that pollen production rates were 4.3〜25.0kg/ha・yr and 0.4〜3.9×10^<12> pollen grains ha・yr in natural stands and 30〜40kg ha・yr and 2.0〜3.3×10^<12> pollen grains/ha・yr in seed orchards. In a good harvest year, pollen grains from 420〜570 grains/cm^2 fell on the fround on the most abundant day, and the total number of fallen pollen grains during one season was 2,150〜2,280 grains/cm^2. The diurnal change of pollen dispersal was influenced by meteorological conditions of the day.
応用森林学会の論文
1992-05-31