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내한성이 각기 다른 3종류 철쭉류에 있어서 광도 및 토양수분조건의 차이가 hardening과 dehardening 과정의 내동성 및 체내수분상태에 미치는 영향
설종호(Sul Jong Ho),방광자(Bang Kwang Ja) 한국실내조경협회 2002 室內造景 = Journal of the Korean institute of interior Vol.4 No.1
In order to elucidate physiological factors involved in causing the winter injuries of evergreen Japanese rhododendron (Rhododendron obtusum cv. Hinodegiri and Rhododendron indicum) and semi-evergreen rhododendron (Rhododendron yeooense var. poukhanense), the present studies were conducted from late fall to early spring. The results advocated were summarized as in the followings;<br/> After hardening Rhododendron indicum was killed by low temperature on January. And as we have measured the water potential and water content in stem, water potential and content has continuously increased in both species between February and May. In R. yeooense, the treatment shading had 0.3MPa upper water potential and 3% upper water content than the control. The other side in R obtusum, the treatments with shading had 09MPa upper water potential and 11 upper water content that the control.<br/> The difference of water balance by treatments could be found in vitality of stem measured by TIC method. Especially evergreen R. obtusum in the treatments with shading in has higher vitality than the control.<br/> Integrating the above result, we could find that winter damage of evergreen R obtusum was determined by whether water balance could be recovered from water deficient state during the dehardening period, or not. In order to recover of the water balance, decreasing water loss more important than increasing water supply, and that was effectively achieved by the treatment with shading.