Journal of Korean Society of Forest Science (한국산림과학회지)

Korean Society of Forest Science (한국산림과학회)
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Analysis of Optimal Thinning Prescriptions for a Cryptomeria japonica Stand Using Dynamic Programming

동적계획법 적용에 의한 삼나무 임분의 간벌시업체계 분석

  • Han, Hee (Department of Forest Sciences, Seoul National University) ;
  • Kwon, Kibeom (Department of Forest Sciences, Seoul National University) ;
  • Chung, Hyejean (Department of Forest Sciences, Seoul National University) ;
  • Seol, Ara (Research Institute for Agriculture and Life Sciences, Seoul National University) ;
  • Chung, Joosang (Department of Forest Sciences, Seoul National University)
  • 한희 (서울대학교 산림과학부) ;
  • 권기범 (서울대학교 산림과학부) ;
  • 정혜진 (서울대학교 산림과학부) ;
  • 설아라 (서울대학교 농업생명과학연구원) ;
  • 정주상 (서울대학교 산림과학부)
  • Received : 2015.10.02
  • Accepted : 2015.12.08
  • Published : 2015.12.31
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Abstract

The objective of this study was to analyze the optimal thinning regimes for timber or carbon managements in Cryptomeria japonica stands of Hannam Experimental Forest, Korea Forest Research Institute. In solving the problem, PATH algorithm, developed by Paderes and Brodie, was used as the decision-making tool and the individual-tree/distance-free stand growth simulator for the species, developed by Kwon et al., was used to predict the stand growth associated with density control by thinning regimes and mortality. The results of this study indicate that the timber management for maximum net present value (NPV) needs less number of but higher intensity thinnings than the carbon management for maximum carbon absorption does. In case of carbon management, the amount of carbon absorption is bigger than that of timber management by about 6% but NPV is reduced by about 3.2%. On the other hand, intensive forest managements with thinning regimes promotes net income and carbon absorption by about 60% compared with those of the do-nothing option.

이 연구의 목적은 국립산림과학원 한남시험림의 삼나무조림지에서 목재 및 탄소 경영을 위한 최적의 간벌시업체계를 결정하기 위해 수행되었다. 이 문제를 풀기 위해 Paderes and Brodie에 의해 개발된 PATH 알고리즘을 의사결정 지원체계로 그리고 임분생장예측을 위해 권기범 등이 개발한 임분생장모델을 적용하였다. 이 임분생장모델은 개체목간의 거리에 대한 고려가 없이 임목의 고사나 간벌과 같은 임분밀도 조절 요인에 의한 생장효과를 예측할 수 있다. 분석 결과 순현재가를 극대화하기 위한 목재생산경영은 탄소흡수량을 극대화하기 위한 탄소경영에 비해 간벌의 횟수는 적었지만 간벌강도가 상대적으로 큰 값으로 나타났다. 탄소경영의 경우 목재생산경영에 비해 탄소흡수량이 약 6% 증가한데 비해 순수익은 약 3.2% 감소하는 것으로 나타났다. 한편 탄소경영이나 목재생산경영을 위한 집약적 경영은 무간벌 시업조건을 전제로 하는 '무간벌 대조구'의 경우에 비해 약 60% 정도의 탄소흡수 및 순수익 증진효과가 있는 것으로 나타났다.

Keywords

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