Pollen Dispersion of Cryptomeria japonica and Cupressaceae in Morioka City during 23 years

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  • 盛岡市における23年間のスギ・ヒノキ花粉飛散状況について
  • モリオカシ ニ オケル 23ネンカン ノ スギ ヒノキ カフン ヒサン ジョウキョウ ニ ツイテ

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Abstract

For a period of 23 years, ending in 2006, the authors investigated airborne pollen dispersion of Cryptomeria japonica and Cupressaceae in Morioka City. The dispersed pollen was collected with Durham samplers placed in Morioka Yuuai Hospital from 1984 to 1997, and in Morioka Civic Cultural Hall from 1998 to 2006. The average date for initial pollen observed, during the 23 years, was February 24^<th>. When the date for initial pollen observed was estimated by using a regression formula, February 23^<rd> in 2006 was 19 days earlier than March 13rd in 1984. There was also a tendency for the date of pollen release began to be earlier in the later years of the study. The average pollen count of 3, 306 grain/cm^2 over the 23 years differed significantly from this on a year by year basis. When a regression formula was calculated using 5-year moving average, the total pollen count of 4, 218 in 2006 was double that in 1984. Abundant years with more than 3, 000 grain/cm^2/year amounted to nine years. The pollen count with more than 30 grain/cm^2/day was observed for 30 days on average in an abundant year, but for only 13 days on average in an intermediate or poor year. The date of pollen release began for Cupressaceae was usually about a month later (April 9^<th>) than for that of Cryptomeria japonica. The total pollen count of Cupressaceae was 118 on average for the 8-years of observations ; this represents only 3.3% of that for Cryptomeria japonica and Cupressaceae combined.

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