Seasonal Change in the Temperature Coefficient Q_10 for Respiration of Field-Grown Hinoki Cypress (Chamaecyparis obtusa) Trees :

NDLデジタルコレクション 被引用文献5件 参考文献32件
  • Yokota,Taketo
    Laboratory of Forest Ecophysiology, School of Agricultural Sciences, Nagoya University:(Present)Global Environment Division, National Institute for Environmental Studies
  • Hagihara,Akio
    Laboratory of Forest Ecophysiology, School of Agricultural Sciences, Nagoya University

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The effect of temperature upon nighttime respiration was examined on four different sized sample trees in a 17-year-old hinoki cypress (Chamaecyparis obtusa (Sieb. et Zucc.) Endl.) stand over two years. Seasonal changes in Q_10 values and their responses to mean temperature were investigated. On the basis of the monthly relationships between nighttime respiration (r) and temperature inside a chamber (θ), r=r_0 exp(kθ), the Q_10 value (=exp(10k)) was calculated. The Q_10 values were high (Q_10〓3.O) in winter when mean air temperature was low, and gradually decreased toward summer (Q_10〓1.5) through spring with increasing temperature. The Q_10 values were negatively correlated with mean air temperature. The response of Q_10 Values to mean air temperature was described by a single equation, regardless of tree size. This result, which might be characteristic of this species, shows that respiration of C. obtusa trees is promoted by slight increases of air temperature in winter season. On the other hand, temperature sensitivity of total respiration reduced during growing season when ambient temperature was high. These changing temperature sensitivity according to seasons may depend on the seasonal change of the ratio of growth respiration to total respiration. It is concluded that changes in temperature due to changing seasons not only change respiration rate, but also change the response of respiration rate to temperature by shifting Q_10 values.

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