Abstract
본 연구는 전라남도 광양시 백운산의 고로쇠나무 수액의 출수와 영향인자들을 분석하여 최적의 수액출수 조건을 얻고자 출수량, 고로쇠나무 흉고직경, 시험지의 기온과 상대습도를 2008년 1월 15일~3월 28일의 기간에 측정하여 출수량과 다른 측정값들과의 상관성 분석을 수행하였다. 수액 출수량은 고로쇠나무의 직경이 클수록 증가하였으며 출수에 필요한 최소 흉고직경은 17.1 cm로 분석되었고, 출수 시기는 직경별로 차이가 없었다. 수액 출수가 관찰될 때 일최저기온은 <TEX>$-2.4{\pm}1.5^{\circ}C$</TEX>, 그리고 일최고기온은 <TEX>$6.0{\pm}1.8^{\circ}C$</TEX>로 영상과 영하의 기온이 교차 하였고, 반면에 하루 종일 영상 혹은 영하의 기온을 유지시 출수가 관찰되지 아니하였다. 수액 출수량과 기온 및 대기습도와의 상관분석에서 수액출수량은 일최고기온, 일교차, 일최고습도, 일최저습도, 일평균습도에 유의성이 있었으며, 수액출수량과 일최고기온의 상관계수는 0.768 (P < 0.01)로 가장 높게 나타났다. 줄이들 인자들에 대한 편상관 분석결과 일최고기온이 주요 영향인자이었다. 수액 출수에는 일중 영하와 영상의 기온이 교차해야 하고 일최고기온이 높을수록, 그리고 고로쇠나무의 흉고직경이 클수록 출수량이 높았다. This study was carried out to investigate the optimum condition for sap exudation of Acer mono Max. tree in a site of Mt. Baekun, Kwangyang city, Korea. Amount of sap exudation, air temperature, relative air humidity and tree diameter at breast height (DBH) were monitored for the period of January 5 through March 28, 2008, and correlation analysis of several factors affecting on sap exudation was carried out. As the diameter of Acer mono at breast height increased, the amount of sap was linearly proportional. Sap exudation initiated at February 18, and occurred intensively in the period of February 28 through March 10, resulting in 84% of total sap amount by volume. During sap exudation, the minimum temperature was averaged at <TEX>$-2.4{\pm}1.5^{\circ}C$</TEX> and the maximum at <TEX>$6.0{\pm}1.8^{\circ}C$</TEX>, while there was no sap exudation whenever temperature was below or above <TEX>$0^{\circ}C$</TEX> all the day long. The maximum temperature, range of temperature and the maximum, minimum and mean humidities in air were significant factors affecting on amount of sap. The maximum air temperature had the highest correlation coefficient with 0.768 (P < 0.01) and was also considered as the principal factor by partial-correlation analysis. These results showed that sap exudation required daily air-temperature fluctuation from below to above <TEX>$0^{\circ}C$</TEX>, and the amount of sap was strongly dependent on the highest daily-temperature and DBH of tree.
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