본 연구는 정원소재용 자생식물인 돈나무를 건전한 묘목으로 생산하기 위해 적정 차광비율을 구명하고자 수행되었다. 차광은 0%(T0), 55%(T55), 75%(T75)의 3수준으로 처리하였으며, 간장 및 근원경 생장, 엽 수, 바이오매스, 묘목품질지수(SQI), 엽록소 함량 등을 측정하였다. 간장 생장과 바이오매스는 T75가 통계적으로 유의성 있게 가장 높았지만(p ˂ 0.05), 근원경 생장과 엽 수는 처리 간의 통계적인 유의성은 없었다(p > 0.05). 묘목품질지수는 T75가 통계적으로 가장 높게 나타났으며(p ˂ 0.05), 다른 두 처리에 비해 약 45% 이상 높았다. 엽록소 a와 b, a/b 비율, 총 엽록소 함량 모두 T75가 통계적으로 유의성 있게 가장 높았다(p ˂ 0.05). 본 연구 결과로 돈나무는 T75에서 간장 생장, 바이오매스, 묘목품질지수, 엽록소 함량이 가장 높게 나타났으며, 이를 통해 돈나무 묘목 생산체계 구축을 위한 기초자료로 활용될 수 있을 것으로 기대된다.

This study surveyed the distribution and characteristics of epiphytes and host trees in Jejudo’s warm-temperate evergreen forests area. The gathered data will be used for evaluating ecological changes according to climate change. The study found 46 species of epiphytes in Jejudo; 12 of which were species of pteridophytes and 5 species of orchids, totaling 17 species of epiphytes. The appearance frequency was the greatest with Lepisorus thunbergianus, followed by Lemmaphyllum microphyllum and Lepisorus onoei. The area with the greatest diversity of epiphytes was nutmeg tree forests which have the largest number of 2.89 average species. Lemmaphyllum microphyllum had the greatest percent cover of the epiphytes whose importance was found to be the greatest. The factors involved were the epiphytes' diversity index (0.64), maximum species diversity (1.23), evenness (0.52), and dominance (0.48). The study has noted the distribution characteristics of epiphytes according to altitudes above sea level. The Lemmaphyllum microphyllum can survive at an altitude of 600 m above sea level, Lepisorus thunbergianus at 200–1,400m above sea level, Lepisorus onoei. at 400–1,000 m, and Gonocormus minutus at an altitude above 800 m. The host trees, consisting of Quercus serrata, Castanopsis cuspidata var. sieboldii, and Carpinus laxiflora, stands at 2–19 m high and 2.5–120 ㎝ wide, showing diverse kinds of trees and sizes. Jejudo’s warm-temperate evergreen forests have lower epiphyte diversity compared with those of subtropical and tropical areas in Japan and China. Based on the characteristics of the host trees order, epiphytes' distribution associated with the altitude above sea level was typical.