Germination Traits and Adaptive Regeneration Strategies of the Three Carpinus Species
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概要
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Germination tests in the three sympatric Carpinus species, C. laxiflora, C. tshonoskii, and C. cordata, were carried out to clarify theirgermination traits in relation to the regeneration strategies. Seeds did not germinate just after ripening under any conditions in thethree species. After one or two rounds of cold stratification. however, C. laxiflora and C. tshonoskii showed high germination percentages ( > 80%) at alternating temperature in light while C. cordata did not. After a long-term (10 months) cold stratification, about100% of C. cordata seeds germinated, although about 70% of these seeds were in "conditional dormancy" and cannot germinatein the dark. Seed germination in the three Carpinus species was enhanced by alternating temperature, but not by light exposure. Theseresults suggest that the seeds of the three species are dormant just after ripening and the dormancy is broken by cold stratification.with intra-generic variations in the breakage. Germination traits in each species may be closely related to the regeneration strategy;C. cordata maintains a persistent seed bank with seed dormancy and regenerates after disturbances as a seed bank strategist, whereas the other two species germinate in the next spring after seedfall and regenerate depending either on existing disturbed-sites or sitesof recent disturbances after seedling establishment as a seed rain strategist (C. tschonoskii) or seedling bank strategist (C.laxiflora).
- 一般社団法人日本森林学会の論文
- 2000-08-16
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