柑橘樹の水分収支に起因する周期的徴細変動現象に関する研究-3-地温がナツダイダイ実生葉厚さの変動現象に及ぼす影響〔英文〕

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To examine the effect of soil temperature on cyclic fluctuations, experiments were carried out under prescribed environmental conditions.Fluctuations in leaf thickness were monitored by a differential transformer and the temperature of the same leaf by a thermocouple. The cyclic fluctuations in leaf thickness followed those of the leaf temperature. Harmonic analysis indicated that the time lag was about 553sec to 641sec.When the soil temperature at the center of the pot was lowered, the absolute leaf thickness decreased in accompanying cycling. However, the cyclic fluctuations disappeared when the soil temperature was further lowered. The critical temperature was 17°C in early October and 11°C in late November. In early October, the cyclic fluctuations appeared again in two and a half hours when the soil temperature was raised and did not disappear even when the soil temperature reached to 36°C. In late November, however, it took more time to recover the cyclic fluctuations and above 35°C they became irregular again. From these results it was postulated that root adaptability to temperature in terms of cyclic phenomenon changed with the advancement of the season. Further study is reqired to clarify how root activity plays a role in stomatal movements.
園藝學會の論文