3가지 목본성 정원식물의 맹아기에 필요한 적산온도 분석

Analysis of Accumulated Temperature According to Sprouting of 3 Garden Woody Plants

The rapid urbanization led to construction of urban structures and buildings in uniform, damaging the urban landscape. One of the methods to enhance the urban landscape is expansion of green area. The problem is, however, there are much differences in blossoming seasons that are of same species and area, which is due to microclimate caused by many environmental factors and conditions. The differences in blossoming seasons deter harmonized arrangement for beautiful urban landscape. The objective of this study is to find the accumulated temperature for 80% of growth for sprouting so that blossoming season can be expected. To this end, Cornus officinalis Siebold & Zucc, Corylopsis gotoana var. coreana, and Forsythia koreana(Rehder) Nakai that are unrelated to accumulated temperature were collected in Suwon. Then, 30 flower buds were put in place in growth phases of 5, 10, 15, and 20℃, which repeated 4 times. The sprouting time of flower buds and temperature were checked every 2 days. It turned out that the higher the temperature was, the more facilitated the sprouting time was. However, excessive high temperature tended to deter the sprouting due to certain characteristics of plants. The spouting speed was the highest for cornus fruit. Fragrant winterhazel, and forsythia were the next. At temperature of 15℃, however, the sprouting speed of forsythia was higher than that of fragrant winterhazel temporarily. At 20℃, forsythia had higher sprouting speed than fragrant winterhazel, The accumulated temperature necessary for 80% of growth for sprouting was 169.3±7.7℃ for C. officinalis Siebold & Zucc, 226.0±18.0℃ for C. gotoana var. coreana, and 279.0±0.4℃ for F. koreana(Rehder) Nakai.