二, 三の落葉広葉樹の幹径の日変動量とそれを左右する環境要因

概要

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To explain the mechanism of radial growth of forest trees, the daily radial fluctuations of trunks of Paulownia tomentosa STEUD., Pterocarya rhoifolia SIEB. et ZUCC., and Populus sieboldii MIQ. were followed using a dial-gauge dendrometer, and their controlling factors were studied for 125 days in the 1983 growing season. The largest daily radial fluctuation, 450μ, was observed in P.tomentosa. The fluctuations were affected considerably by the weather conditions. The mean values on fine days were 1.3 to 1.9 times larger than those on rainy days. Significantly high correlations of radial fluctuations were found with daily air-temperature differences, daily maximum vapor pressure deficits, duration of sunshine, and daily maximum air-temperatures. By means of stepwise multiple-regression analysis, common controlling factors for the three species were not detected. But five significant controlling factors, such as maximum air-temperature and duration of sunshine, coincided with each other for P.rhoifolia and P.sieboldii. Comparatively high coefficients of determination were 0.872 with 8 significant factors for P.sieboldii and 0.746 with 6 significant factors for P.rhoifolia. A low coefficient of 0.334 was observed in vigorous P.tomentosa with 2 significant factors.
日本森林学会の論文
1985-04-25