백합나무의 재적생장에 대한 수령 간 상관
Age-age Correlation on Volume Growth of Yellow Poplar (Liriodendron tulipifera L.)
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초록
본 연구는 백합나무 우수개체의 조기선발을 위한 수령을 설정하기 위해 수행되었다. 이를 위해1970~1981년에 조성된 백합나무 성숙림 6개소를 대상으로 생장, 입지, 기후인자를 조사하였으며,재적생장에 대한 수령 간 상관분석을 실시했다. 각 조사지를 우량구, 보통구, 불량구로 나누어입지요인별 출현빈도를 분석한 결과, 연평균기온 10~12℃, 극한최저기온 –15~-20℃, 연간가능일수240~260일, 해발고 200~500m 범위 그리고 산록, 서 또는 북서사면, 사면경사 10°미만이고풍노출도가 낮은 보호된 지역에서 백합나무의 생장이 우수한 것으로 나타났다. 백합나무의 수령별재적생장에 대한 변이계수를 분석한 결과, 20년생 이후부터 변이가 크게 감소하며, 37년 이후에는완만해지는 경향을 나타냈다. 수령별 연년재적생장량 분석에서도 37년생부터 생장량이 크게 감소하는경향을 나타냈다. 이러한 분석결과를 토대로 백합나무의 적정 벌기령을 38년으로 추정했다. 수령 간순위상관 분석을 통해 벌기령의 생장과 가장 빠른 시기에 유의한 상관을 나타낸 20년을 조기선발수령으로 제안했다.
Abstract
This study was conducted to identify suitable early selection age on volume growth ofLiriodendron tulipifera. For this purpose, six mature plantations (established in 1970~1981) of L. tulipifera were surveyed. According to the growth performance, each plantation was divided into 3site classes (good, medium and poor). Within each plot, site factors, environmental factors andgrowth of each tree within plot were investigated. L. tulipifera showed the best growth performancein the areas such as piedmont, west/northwest aspect, slope less than 10°, protected from windexposure, 10~12℃ in annual mean temperature, -15~-20℃ in extremely low temperature, 240~260days in annual mean growing days and 200~500m in altitude. According to the age-coefficient ofvariation on volume growth curve, the variation was reduced from 20 years and gradually flated offafter 37 years. Similar pattern was observed in mean annual increment of volume growth, i.e., rapiddecrease after 37 years. Based on these results, we temporarily suggested the 38 years as a finalcutting age for L. tulipifera. According to the results of rank correlation analysis, the earliest agewith significant correlation to final cutting ages was 20 years. Thus, we suggested that the earlyselection age on volume growth of L. tulipifera was 20 years.
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