본 연구는 직경분포에 근거한 잣나무 임분수확표(지위지수 14)를 활용하여 등급별 목재 생산량을 분석하기 위해 수행되었다. 잣나무 임분수확표는 국립산림과학원에서 개발된 직경분포 함수를 이용하여 직경급별 본수를 예측하였으며, 목재 생산량은 말구직경 을 기준으로 3개 등급으로 구분하였다. 연구결과 잣나무 임분수확표를 활용한 원목생산량은 임령이 증가할수록 1등급 생산량이 증가하였고, 1등급(재장 3.6m) 원목은 40년부터 생산 가능한 것으로 분석되었다. 임분단위 원목의 생산량은 직경급별 생산되는 등급별 원목 개수와 직경급별 본수에 따라 생산량에서 차이를 보였다. 임령에 따른 등급별 원목의 이용재적은 원목 생산량에 비례하였 고, 2등급 이용재적비율은 30년과 40년일 때 전체 임분 이용재적의 60% 이상을 차지하였으며, 임령이 증가할수록 1등급 이용재적비율 이 높아짐에 따라 감소하였다. 임분단위 이용재적은 임령이 증가할수록 1등급과 2등급(재장 3.6m) 이용재적은 증가하였고 3등급은 감소하였다. 임분단위 이용재적비율은 3등급의 경우 20년일 때 85% 이상 차지하였고, 2등급은 40년일 때 74% 이상 차지하였으며, 1등급 이용재적이 증가하는 50년 이후 부터 감소하였다.

This study utilized stand yield table (site index 14) of Pinus koraiensis based on diameter distribution in order to analyze timber production by grade. The stand yield table of Pinus koraiensis used the diameter distribution function, developed by the National Institute of Forest Science, to predict the number of trees by diameter classes. Timber production was classified into three grades based on the small-end diameter. The study result shows that in terms of log production, which utilized the stand yield table of P. koraiensis, the 1st grade production has risen as stand age increased, while the 1st grade (log length 3.6m) log has been analyzed that it will be able to produce starting from the year of 40. Production of log by stands unit has presented differences based on the number of trees by diameter classes, and on the amount of log by grade, which is produced by diameter classes. Merchantable volume of the log by grade based on stand age is proportional to the log production, and in the year of 30 and 40, the 2nd grade merchantable volume rate has occupied more than 60% of the entire stands merchantable volume, while it has decreased as stand age increased which leads to a rise in the 1st grade merchantable volume rate. In terms of merchantable volume by stands unit, the 1st and 2nd grade (log length 3.6m) merchantable volume has increased, and the 3rd grade has decreased as stand age increased. Moreover, in respect of merchantable volume rate by stands unit, the 3rd grade has occupied more than 85% in the year of 20, and the 2nd grade has comprised more than 74% in the year of 40, while it has decreased starting from the year of 50, when the 1st grade merchantable volume rises.

초록
ABSTRACT
서론
재료 및 방법
    1. 임분의 직경분포 예측체계
    2. 잣나무 목재이용 시나리오
결과 및 고찰
    1. 잣나무 임분수확표 예측
    2. 잣나무 임분수확표를 활용한 원목 생산량 분석
    3. 잣나무 임분수확표를 활용한 원목 이용재적 분석
References

• 권순덕(국립산림과학원 산림복지연구과) | Soon-Duk Kwon (Division of Forest Welfare Research, National Institute of Forest Science) Corresponding author
• 곽두안(국립산림과학원 산림복지연구과) | Doo-Ahn Kwak (Division of Forest Welfare Research, National Institute of Forest Science)