제주시험림 보속수확체계 정립을 위한 산림계획모델 Woodstock의 적용
Application of Woodstock Forest Planning Systems to Regulate Forest Harvest Scheduling of Jeju Experimental Forest
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초록
이 연구는 제주시험림을 사례지역으로 Woodstock 선형계획시스템의 국내 적용성을 검토하기 위하여 수행되었다. 제주시험림을 산림의 입지적 특성에 맞게 자연환경보전(890ha), 수자원함양(478ha), 목재생산(924ha) 등 산림기능별로 구분하여 안정적인 목재보속생산을 유도하는 장기경영계획을 수립함으로써 100년 또는 200년 후의 장기 비전을 제시하고자 하였다. 경영목적에 따라 2개의 경영시나리오를 설정하였으며, 시나리오별 계획기간동안의 산림축적의 변화, 임목 수확량, 간벌량, 표고원목 생산량, 영급배치의 변화 등을 예측하였다. 시나리오(Ⅰ)의 경우 지속적으로 산림축적을 증가시켜 나가면서 갱신면적은 연간 5 내지 10ha 정도로 최소화하여 연간 2,270㎥의 임목수확이 가능하였다. 시나리오(Ⅱ)는 일정축적을 유지하면서 잠재수확량을 증가토록 하여, 5분기부터 ha당 270㎥ 의 산림축적을 유지하면서 10분기부터는 연간 5,000㎥의 수확이 가능한 것으로 나타났다. 현실임분의 매우 편중된 영급구조의 개선은 시나리오(Ⅰ)를 적용할 경우 8분기, 시나리오(Ⅱ)를 적용할 경우에는 5분기부터 가능하였다. Woodstock 모델은 다양한 산림경영시나리오 및 시업체계를 설정할 수 있어 사용자 중심의 계획을 수립하는데 있어 효율성과 적용성이 높은 것으로 나타났다.
Abstract
This study was conducted to see the applicability of Woodstock, a LP-based forest planing system, by developing a model for Jeju experimental forest as a case study. This model aimed at presenting a long-term vision of 100 or 200 years by establishing a long-term forest planning system according to the forest functions such as nature conservation(890ha), water conservation(478ha) and timber production(924ha) which are classified by, and suitable to the site characteristics. Two planning scenarios were built according to the management objective and many factors such as forest growing stock, harvest volumes, thinning volumes, production of mushroom logs, and the degree of changes for age-class distribution of the study area were predicted during the planning horizon for each scenario. In case of scenario Ⅰ, annual timber production of 2,270㎥ was estimated in the conditions of continuously increasing the growing stock and minimizing the yearly regeneration area by 5 to 10 hectares. Meanwhile, scenario Ⅱ with a stable growing stock and increasing harvest volume by period, showed 270㎥ per ha of forest growing stock after planing period 5 and 5,000㎥ of annual timber production after period 10. A very disproportionate age-class distribution of forest stands was found and predicted to alter for the better distribution of age classes from period 8 in scenarioⅠ and period 5 in scenarioⅡ, respectively. Woodstock system showed its efficiency and applicability in terms of user-oriented model development through enabling users to establish a variety of forest management scenarios and prescriptions.
참고문헌 (22)
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