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Seed survival for three decades under thick tephra

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Title: Seed survival for three decades under thick tephra
Authors: Tsuyuzaki, Shiro Browse this author →KAKEN DB
Keywords: Hypericum erectum
Juncus effusus
Mount Usu
Rumex obtusifolius
seed longevity
spatial heterogeneity
Issue Date: 1-Sep-2010
Publisher: Cambridge University Press
Journal Title: Seed Science Research
Volume: 20
Issue: 3
Start Page: 201
End Page: 207
Publisher DOI: 10.1017/S0960258510000139
Abstract: Seed longevity in situ is a prerequisite for understanding the life histories and community dynamics of species, although long-term longevity under thick tephra has not been documented because of a lack of opportunity and/or awareness. The seed bank for this study was estimated by both germination and flotation tests. Seeds of 17 species have survived with high density, having been buried under thick tephra for 30 years, since the 1977-1978 eruptions on Mount Usu, Hokkaido Island, northern Japan. The total seed density was > 1000/m2. Rumex obtusifolius was the most common seed-bank species for 30 years, but decreased in density between 20 and 30 years. More seeds of Hypericum erectum occurred in deeper soil. The total seed density decreased gradually for 30 years, but H. erectum and Juncus effusus did not decline. Native seeds tended to be viable longer than exotic seeds. These results suggest that small, native seeds tend to survive longer with deep burial, while the more numerous weedy, exotic seeds located at the soil surface declined faster. The seed bank provides long-term monitoring of seed survival under natural conditions, and could be used to detect genetic changes.
Rights: © Cambridge University Press 2010
Type: article
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 露崎 史朗

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