• Horticultural Science & Technology
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• v.16 no.1
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• pp.30-32
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• 1998

Growth environments of Cypripedium macranthum Sw. habitats distributed in mountains and highland plains of northern part of Kyunggi-do and Kangwon-do in Korea, were studied in order to obtain basic data. Mean temperature in habitats of Cypripedium macranthum was $14^{\circ}C$ and minimum value was recorded $-7^{\circ}C$ in January, and maximum value was $28^{\circ}C$ in August. Mean soil temperature of the orchid sites was $11^{\circ}C$ and minimum value was $-4^{\circ}C$ in January. The light intensity from March to May was 48,000~51,400 lux and the lowest value was 11,500 lux in July. Light intensity in shade habitat sites from July to August was dropped to 470~865 lux, and the SPAD value was 34.3 in July, which was the highest of the year. The range of soil acidity was pH 5.6~5.8 and soil moisture was 16.4%~36.2%. The highest soil moisture was 36.2% on June. The Cypripedium habitats were correlated with temperature (especially high temperature), light intensit, and soil moisture. However, critical factor seems to be soil moisture in distribution of Cypripedium macranthum in Korea.