@article{oai:kpu.repo.nii.ac.jp:00004881,
 author = {徳岡, 正三 and Tokuoka, Masazo},
 journal = {京都府立大學學術報告. 農學, The scientific reports of Kyoto Prefectural University. Agriculture},
 month = {Oct},
 note = {呼吸量を知るうえで基礎的な資料となる呼吸速度(mgCO_2/g dry weight/hour at 25℃)を, スギのさし木苗を用いて, 発根直後から約2年間にわたり, 1ヵ月間隔でもとめた。測定は個体と部分(0年生, 1年生, 2年生の各葉, 主軸, 地下主軸, 根)にわけて行なった。呼吸速度は個体, 各部分のいずれについても, 春と秋に急激に増加し, 春から夏, 秋から冬にかけて緩慢に減少した。しかし, 根だけはこの傾向がやや異っており, 5ヵ月の間隔をおいて規則的に呼吸速度の増減をくりかえし, 冬にも呼吸速度の増加がみられた。春と秋における呼吸速度の増加は, スギ苗の生長の盛んな時期が春と秋にあるという週期的な生理活性の消長が大きく影響をおよぼした結果であると考えられる。また, 秋に比較的高い呼吸速度がみられたのは, 日おいをはずしたことによる一時的な光の強い照射が1つの原因とも考えられる。葉の呼吸速度は葉令が進むとともに減少しており, 葉の生理活性が年々低下することが推察された。さらに葉令が4,5年とふえる場合には, 呼吸速度は季節的な週期性に影響されず, 温度依存による基礎代謝だけか, あるいは落葉するということが考えられる。呼吸作用が本来, 温度に依存することから, 秋から冬への呼吸速度の減少は温度依存的な現象であると思われる。一方, 春から夏へは, この期間で盛んに物質生産が行なわれており, 物質の蓄積が続くが, 呼吸基質は一定量を維持するわずかの増加しかないため, 単位乾重あたりで呼吸速度をもとめた場合, 物質生産が続くかぎり減少傾向となることが考えられる。しかし, 週期の一環としての生長の開始直前では, 何らかの作用により物質の変化, 転流などがあって, 呼吸基質の増加や活性化の起ることが予想される。また, 地下部分の呼吸速度が地上部分のそれよりも遅れて増加したり, 季節変化に若干のちがいがあることから呼吸基質となる物質の苗体内での流れが考えられる。, The respiratory rates (mgCO_2/g dry weight/hour at 25℃) are used as data when we estimate the amount of respiration. In this experiment, the respiratory rates of cuttings of Cryptomeria japonica were measured at intervals of one month during about two years from immediately after root initiation. The rates of individual and six sections, such as zero year old leaf, one year old leaf, two years old leaf, terrestrial-stem, subterranean-stem (inserted stem under the ground for cutting) and root were measured. The respiratory rates, in both case of individual and sections, showed the tendencies to increase rapidly in spring and fall, and to decrease gradually from spring to summer and from fall to winter (see Figure 1,2 and 5.), too. However only the rates of root somewhat differed from these tendencies, its respiratory rates showed the tendencies to increase also in winter and to increase regularly at intervals of five months (see Figure 6.). It is considered that these seasonal changes in respiratory rates were influenced considerably by the rise and fall of periodic physiological activity, seeing that growing season of Cryptomeria japonica exists in spring and fall. And it is supposed as one reason that the rates of fall observed relatively high values were affected by the strong irradiation of sunlight because sun-shade was taken off September. The respiratory rates of leaf decreased with the lapse of time, namely, with the lapse of leaf-age. For this reason, it is estimated that physiological activity of leaf falls every year. When leaf passes for four to five years in the future, it is supposed that the rates of leaf do not depend on seasonal periodicity, and leaves live only basic metabolism at various temperatures, or defoliate. It is considered that the gradual decrement in respiratory rates from fall to winter depends on the temperature, on the other hand, the gradual decrement from spring to summer is due to a series of dry matter production without accompanied by respiratory substances. Because, when dry matter production continues without accompanied by increment of respiratory substances, or respiratory activity, if the respiratory rates are given by 'per unit dry matter weight', then the rates are indicated necessarily by the tendency of decrement. But it is supposed that just before beginning of growth, respiratory substances are increased and activated by the changes and the translocations of material, seeing that the rates increase rapidly in spring and fall. And if the respiratory rates are compared leaf and terrestrial-stem (above the ground) with subterranean-stem and root (under the ground), then it is recognized that the seasonal changes in the respiratory rates are slightly different. Therefore, it is estimated that respiratory substances translocate the interior of plant. The respiratory rates of individual and those of total section did not agree. The rates of total section were extremely high values than those of individual. It is considered that in each section, large amounts of CO_2 were released by the excision of plant organs.},
 pages = {71--77},
 title = {Seasonal changes in respiratory rates of cultivated cuttings of Cryptomeria japonica after root initiation (Forestry)},
 volume = {23},
 year = {1971},
 yomi = {トクオカ, マサゾウ}
}