二, 三の落葉広葉樹の日肥大生長量および日伸縮量とそれらを左右する環境要因

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Daily radial growth (d. r. g.) calculated as the difference of the maximum trunk radius on successive days, for Paulownia tomentosa STEUD., Pterocarya rhoifolia SIEB. et ZUCC., and Populus sieboldii MIQ. was found from early May, 1983 into late August, middle September, and middle October for the last, second, and first species, respectively. The peak d.r.g. appeared in middle June on the first and in early July on the latter two. The d.r.g. of all three species was high in rainy weather. The expansion and contraction of tree stems obtained from the differences of the daily total fluctuation of trunk radius and the daily radial growth were, inversely, high in fine weather. It was confirmed by stepwise multiple regression techniques that the d.r.g. of these species was controlled by the daily air temperature difference and the five-day total precipitation. The contribution ratios due to several significant factors were 41% of six factors for P. tomentosa, 41% of seven factors for P. rhoifolia, and 52% of eight factors for P. sieboldii. The daily expansion and contraction of stems of the three species were correlated to a considerably extent with factors affecting the internal water balance in trees, such as the saturation deficit and the duration of sunshine. The contribution ratios by the significant factors were 70% of four factors, 86% of five factors, and 86% of six factors for P. tomentosa, P. rhoifolia, and P. sieboldii, respectively.
日本森林学会の論文
1986-06-25

二, 三の落葉広葉樹の日肥大生長量および日伸縮量とそれらを左右する環境要因

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