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Acorn production by Kashiwa oak in a coastal forest under fluctuating weather conditions

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Abstract:

We modeled the annual acorn crops of Kashiwa oak (Quercus dentata Thunb.) in a coastal forest in Hokkaido, northern Japan. Shoots of Kashiwa oak withered away during winter because of sea breeze and cold, and succeeding production of female inflorescences were strongly affected by mortality of buds. Thus, strong sea breeze and cold winters reduced the survival ratio of buds and further resulted in reduction of female flowering. Number of female flowers was related with current acorn crops, however, survival of female flowers after pollination was strongly influenced by warmth in the flowering period. Regression analysis of the annual acorn crop versus weather conditions suggests that acorn crop was decreased by cool conditions in the flowering period. A model equation was constructed to estimate the annual acorn crops by three weather variables: cumulative velocity of sea breeze and mean monthly temperature in winter (December–March) and maximum monthly temperature in current flowering period (June). This model equation explained 89.2% of observed acorn crops of Kashiwa oak in the coastal forest.

Nous avons modélisé la production de glands du chêne denté (Quercus dentata Thunb.) dans une forêt côtière de l'île d'Hokkaido, au nord du Japon. Les pousses du chêne denté dépérissent pendant l'hiver à cause de la brise qui vient de la mer et du froid de telle sorte que la production subséquente d'inflorescences femelles est fortement affectée par la mort des bourgeons. Par conséquent, une forte brise venant de la mer et des hivers froids réduisent le taux de survie des bourgeons et entraînent une réduction plus importante de la production de fleurs femelles. Le nombre de fleurs femelles est relié à la production courante de glands mais le taux de survie des fleurs femelles après la pollinisation est fortement influencé par la chaleur pendant la période de floraison. Une analyse de régression de la production annuelle de glands en fonction des conditions météorologiques indique que la production de glands diminue lorsque la température pendant la période de floraison est fraîche. Un modèle permettant d'estimer la production annuelle de glands a été construit en fonction de trois variables météorologiques : la vitesse cumulée de la brise de mer et la température moyenne mensuelle durant l'hiver (du mois de décembre au mois de mars) et la température maximum mensuelle pendant la période de floraison (en juin). Ce modèle explique 89,2% de la production de glands du chêne denté dans la forêt côtière.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: January 1, 2002

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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