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Google圖書搜尋
The Variability of Paper Birch, Seed Production, Dispersal, and Germination
John C. Bjorkbom
David A. Marquis
Frank E. Cunningham
出版
Northeastern Forest Experiment Station, Forest Service, U.S. Department of Agriculture
, 1965
URL
http://books.google.com.hk/books?id=iOCB8m_8gp8C&hl=&source=gbs_api
EBook
FULL_PUBLIC_DOMAIN
註釋
Paper birch trees are generally considered prolific seeders that produce at least some seed every year and very large crops of seed periodically. Seed dispersal is widely assumed to begin in early fall and to continue through the winter months. Germinative capacity has been assumed to be fairly low.
