著者
齋藤 秀樹
出版者
耳鼻咽喉科臨床学会
雑誌
耳鼻咽喉科臨床 補冊 (ISSN:09121870)
巻号頁・発行日
vol.1995, no.Supplement76, pp.6-19, 1995-03-20 (Released:2012-11-27)
参考文献数
49
被引用文献数
4 5

Stands of Sugi, Cryptomeria japonica, and Hinoki, Chamaecyparis obtusa, produce 1014 pollen grains per ha per yr in a productive year and 1011-1012 grains in an unproductive one. Little year-toyear fluctuation in pollen production by stands of pioneer and secondary trees is evident, the maximum/minimum ratio within a stand being about 2. In comparison, alder stands produce 2-5×1013grains in both productive and unproductive years. Pollen production rates of Sugi stands increase with increasing age of the stand until 50 yr, showing a constant upper limit for several hundred years thereafter. With regard to year-to-year fluctuations in pollen production rates for Sugi stands, annual rates alternate from high to low every year. This rhythm may be interrupted by the accidental effects of unusually hot dry weather in late June and July. The amount of pollen dispersed into the air can be predicted from the number of male flower buds that fall before flowering in autumn and winter. Control of pollen production in forests by silvicultural techniques while paying attention to the environmental conservation of forests is considered extremely difficult.

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これソース探してみたら、樹齢90年や600年でもじゃんじゃん花粉出しました https://t.co/aMNDIil7Bp (p.8)という論文が見つかりました。60年で出さなくなる https://t.co/a8K65bGSDn というページには特に根拠が書かれておらず。まあ花粉がこれ以上増えないというのは言えそうですが… https://t.co/4cUUI7MLwP https://t.co/8uKn9pHbVy

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