수치임상도 제작을 위한 영상탑재 현장조사 시스템 개발

유병오 ( Byung Oh Yoo ),권수덕 ( Su Deok Kwon ),김성호 ( Sung Ho Kim ) 한국산림과학회 2008 한국산림과학회지 Vol.97 No.4

로지스틱 회귀모형을 이용한 상록활엽수림 생육분포 확률 평가

유병오 ( Byung Oh Yoo ),박준형 ( Joon Hyung Park ),박용배 ( Yong Bae Park ),정수영 ( Su Young Jung ),이광수 ( Kwang Soo Lee ) 한국지리정보학회 2016 한국지리정보학회지 Vol.19 No.1

This study was carried out to assess the distributional probability for Evergreen Broad -Leaved Forests(EBLFs) using the field data and digital climate data that were occurred during the period of 1980 to 2010. For the validation of logistic regression model, the probabilistic value ranged from 33 to 84%, especially the probabilistic value of growing distribution becomes lower patterns with higher altitude. In addition, it has been estimated that the probabilistic value of growing distribution is the highest with 63∼83% among the regional units in temperate/warm-temperate forests.

거리 가중치와 층화를 이용한 최근린기반 임목축적 추정치의 정확도 비교

임종수 ( Jong Su Yim ),유병오 ( Byung Oh Yoo ),신만용 ( Man Yong Shin ) 한국임학회 2012 한국산림과학회지 Vol.101 No.3

본 연구는 최근린 기법에서 거리가중치와 훈련자료의 층화에 의한 추정치의 정확도를 비교하여 효율적인 방 법을 모색하기 위하여 수행하였다. 거리가중치의 경우, 유사성이 높은 훈련자료에 가중치를 부여하는 방법으로 일반 적으로 적용되는 5가지의 계수(0, 0.5, 1, 1.5, 그리고 2)를 비교한 결과, 평균 편차에서 최대 ±0.6 m3/ha로 정확도는 유사한 것으로 나타났다. 훈련자료의 층화에서는 임상구분을 적용하였을 때 추정치의 정확도가 가장 높은 것으로 나 타났으며, 임상구분과 참조수평거리(반경=100 km)를 통합하여 적용하였을 경우에는 임상구분에 의한 추정치와 유사 한 정확도를 나타내었다. 연구대상지의 2010년 기준 평균임목축적과 비교한 결과 최근린 기반 추정치가 약 5 m3/ha 정도 과소 추정되었지만, 조사시점을 고려하였을 때 상당한 정확도를 나타낸 것으로 평가된다. The k-Nearest Neighbor (kNN) technique is popularly applied to assess forest resources at the county level and to provide its spatial information by combining large area forest inventory data and remote sensing data, In this study, two approaches such as distance-weighting and stratification of training dataset, were compared to improve kNN-based forest growing stock estimates. When compared with five distance weights (0 to 2 by 0.5), the accuracy of kNN-based estimates was very similar ranged ±0.6 m3/ha in mean deviation. The training dataset were stratified by horizontal reference area (HRA) and forest cover type, which were applied by separately and combined. Even though the accuracy of estimates by combining forest cover type and HRA- 100 km was slightly improved, that by forest cover type was more efficient with sufficient number of training data. The mean of forest growing stock based kNN with HRA-100 and stratification by forest cover type when k=7 were somewhat underestimated (5 m3/ha) compared to statistical yearbook of forestry at 2011.

임분밀도관리도를 이용한 편백림의 고사량 및 수확량 예측

박준형 ( Joon Hyung Park ),유병오 ( Byung Oh Yoo ),이광수 ( Kwang Soo Lee ),박용배 ( Yong Bae Park ),김형호 ( Hyung-ho Kim ),정수영 ( Su Young Jung ) 한국산림과학회(구 한국임학회) 2018 한국산림과학회지 Vol.107 No.2

본 연구는 편백 조림 임분을 대상으로 임분관리 체계 수립을 위해 임분밀도관리도를 개발하였다. 조사 표본점 216 plots을 활용하여 수확량-임분밀도 관계를 추정하였으며(R²=0.743), 추정된 모수를 바탕으로 임분밀도관리도를 구축 하였다. 생장을 예측한 결과, ha당 3,000 본 조림 후 80년간 솎아베기 시업을 하지 않았을 경우 고사 본수는 12.0~18.1 treesㆍha^-1ㆍyear^-1로 분석되었고, 임분 재적은 463.1~695.4 m³ㆍha^-1, 임분밀도는 1,555~2,038 treesㆍha^-1로 나타났다. 향후 임분밀도관리도는 시업 기준과 수확목표 설정 등 산림 경영 계획 수립에 있어서 효과적으로 활용될 수 있을 것으로 판단된다. This study aims to make the stand density management diagram which is useful for establishing stand density management system in Chamaecyparis obtusa forest. By using 216 sample plots to estimate Yield-Density relationship (R²=0.743), the stand density management diagram was modeled by the estimated parameters. As a result of this diagram, after planting 3,000 trees per hectare the mortality rate of this unthinned C. obtusa stands over 80 years was estimated to be equal to 12.0~18.1 treesㆍha^-1ㆍyear^-1, and stand volume was 463.1~695.4 m³ㆍha^-1, and stand density was 1,555~2,038 treesㆍha^-1. Developed stand density management diagram for C. obtusa is effective to establish the management criteria and production objective. Therefore, this study allowed us to make the optimal forest working plan.

수간곡선식 개발과 국가탄소배출계수를 이용한 졸참나무의 탄소저장량 추정

강진택(Kang, Jin-Taek),손영모(Son, Yeong-Mo),전주현(Jeon, Ju-Hyeon),유병오(Yoo, Byung-Oh) 한국기후변화학회 2015 한국기후변화학회지 Vol.6 No.4

임분 특성에 따른 종가시나무의 물리·역학적 특성

홍남의 ( Nam-euy Hong ),원경록 ( Kyung-rok Won ),유병오 ( Byung-oh Yoo ),정수영 ( Su-young Jung ),김병로 ( Byung-ro Kim ),변희섭 ( Hee-seop Byeon ) 한국목재공학회 2016 목재공학 Vol.44 No.5

Wood properties are affected by environmental factors such as soil, topography, rainfall, and climate change. The physical and mechanical properties of Quercus glauca were analyzed in order to investigate the relationship between wood properties and forest stand characteristics related to regions and forest origins. Physical and mechanical properties of wood were influenced by region. And no significant difference was observed between natural and artificial forests with respect to wood quality properties. Therefore, these findings are expected to be useful as fundamental data for silviculture practices of these species for wood quality.

난대성 주요 3개 수종에 대한 지위지수 추정 및 적지판정 -제주특별자치도와 남부지역을 중심으로-

강성표 ( Sung Pyo Kang ),김종영 ( Jong Young Kim ),유병오 ( Byung Oh Yoo ),안기완 ( Ki Wan An ) 한국도서(섬)학회 2016 韓國島嶼硏究 Vol.28 No.1

The purpose of this study is to develop a forest resource model and prepare for the new afforested land and climate change through estimating the site index(among several methods, the site index is a typical way to digitize the quality of locality). It also aims to evaluate a suitable site with the warm temperate zone’s three major species(Quercus acuta, Castamopsis sieboldii, Machilus thunbergii) that grow in the southern region including the Jeju special self- governing province and island region. Each specie used 32 site environmental factors and the average height of 5 dominant trees`` for the growth model. The partial correlation analysis using the sample tree collected for evaluation was also conducted . In addition to the partial correlation analysis, the study used the on site stem analysis data and made the final site index functional formula by analyzing the site condition which affects the site index table and curve. Also, this study calculated the suitable site space and tabulated the suitable tree figure on site by using the site index functional formula. As a result, the suitable site of Quercus acuta turned out to be over 10 site index 82,522ha, the Castanopsis sieboldii over 12 site index 60,801ha and the Machilus thunbergii over 12 site index 219,442ha. Quercus acuta was evenly spreaded along the coast and island region that had a high annual average minimum temperature, and was located within 20km from the coastline under 400m elevation. The Castanopsis sieboldii’s suitable-site was mainly spreaded out in the island and coastal region, but it also grew up into the inland and its suitable-site showed a large gap between the annual maximum and minimum temperature. The analysis showed that the growth suitable-site of the Machilus thunbergii turned out to be a place abundant with rainfall in the early spring season, and less than 200m elevation along the coastline and island regions. The coefficient of determination was 0.306, 0.271, and 0.259. The result of this study can be used to decide the forest resource composition and establish management plans through estimating the site index of the warm temperature zone’s three major trees and thus help select a suitable tree on a site through evaluation.

소나무재선충병 발생 곰솔임분의 간벌에 따른 토양 호흡 동태

최은진 ( Eun Jin Choi ),서희영 ( Hui Yeong Seo ),이광수 ( Kwang Soo Lee ),유병오 ( Byung Oh Yoo ),김춘식 ( Choon Sig Kim ),조현서 ( Hyun Seo Cho ) 한국임학회 2016 한국산림과학회지 Vol.105 No.1

경남 진주시의 남부산림자원연구소 월아시험림 내 소나무재선충병 발생 곰솔임분의 간벌 처리구를 대상으로 토양 이산화탄소(CO2) 방출량과 토양환경요인 변화를 조사하기 위하여 강도구, 약도구, 대조구를 설치하고 2012년 3월부터 2013년 2월까지 토양 CO2 방출량, 토양온도, 토양수분함량, 토양 pH 변화를 조사하였다. 토양 CO2 방출량의 월별 변화는 간벌처리구와 대조구 사이에 유의적 차가 없었다(P>0.05). 연 평균 토양 CO2 방출량의 경우 처리간 유의적인 차는 없었으나 약도구 0.58 g CO2 m.2 h.1, 강도구 0.49 g CO2 m.2 h.1, 대조구 0.45 g CO2 m.2 h.1 순으로 약도구가 높게 나타났다. 토양 CO2 방출량은 토양온도와 유의적인 지수함수 관계(P<0.05)가 있었으나 토양수분과 토양 pH 와는 유의적인 상관관계가 없었다(P>0.05). Q10 값의 경우 약도구 3.40, 강도구 3.20, 대조구 3.06으로 약도구가 가장 크게 나타나 소나무재선충병 발생 곰솔임분의 간벌처리는 토양온도 상승과 함께 토양 CO2 방출에 영향을 미치는 것으로 나타났다. This study was carried out to investigate the change on soil CO2 efflux rates, soil temperature, soil water content and soil pH by thinning intensity treatments (heavy thinning, light thinning, control) of a black pine (Pinus thunbergii Parl.) stand disturbed by pine wilt disease in Wola National Experimental Forests in Jinju, Gyeongnam province. Monthly variations of soil CO2 efflux rates were not significantly different between the thinning and the control treatments (P>0.05). The annual mean soil CO2 efflux rates were 0.58 g CO2 m.2 h.1 for the light thinning, 0.49 g CO2 m.2 h.1 for the heavy thinning and 0.45 g CO2 m.2 h.1 for the control treatments, respectively. There was a significant exponential relation between soil CO2 efflux rates and soil temperature, but no correlation between soil water content or soil pH and soil CO2 efflux rates. The values of Q10 were 3.40 for the light thinning, 3.20 for the heavy thinning and 3.06 for the control treatments, respectively. The results indicate that soil CO2 efflux rates in a black pine stand disturbed by pine wilt disease could be affected by thinning treatments.

남부지역 구실잣밤나무의 임분특성 및 지역별 물리,역학적 특성

원경록 ( Kyung Rok Won ),홍남의 ( Nam Euy Hong ),정수영 ( Su Young Jung ),유병오 ( Byung Oh Yoo ),변희섭 ( Hee Seop Byeon ) 한국목재공학회 2015 목재공학 Vol.43 No.6

Since physical and mechanical properties of wood are affected by environmental factors such as soil and climate change, this study investigated relationships between wood quality factors and stand characteristics of Castanopsis cuspidata var. sieboldii forest in the southern region of Korea, including Jeollanam-do Province and Je-ju island. The obtained results found very close relationships between physical and mechanical properties of wood and stand characteristics. The air-dried density and strength performance of woods showed a negative correlation with the diameter at breast height (DBH) while they were positively related to altitude and drainage of the forest site. And wood properties showed variations depending on the region. These results brought a conclusion that wood of Castanopsis cuspidata var. sieboldii in the southern region could be useful forest resources for timber production.

남부권역 삼나무림의 지위지수 추정 및 적지 평가

김영 ( Yeung Kim ),김민희 ( Jong Yeong Kim ),진승현 ( Seung Hyun Jin ),유병오 ( Ki Wan An ),이광수 ( Byung Oh Yoo ),김종영 ( Kwang Soo Lee ),안기완 ( Min Hee Kim ),안영상 ( Young Sang Ahn ) 한국임학회 2014 산림과학 공동학술대회 논문집 Vol.2014 No.-

본 연구는 환경인자를 이용하여 남부권역(전라북도, 전라남도, 광주광역시, 경상남도, 부산광역시, 울산광역시 및 제주특별자치도)의 주수종인 삼나무의 지위지수 추정식을 개발하고 적지면적을 추정하여 기후변화에 대비한 새로운 산림자원모델을 개발하고자 수행하였다. 이에 산림입지도와 자동기상측정장치(AWS)를 이용하여 626개소 삼나무 표준지에 대한 67개의 환경인자를 도출하여 최적의 지위지수 추정식을 조제하였다. 추정식에는 8개의 환경인자(A층 토색, B층 토색, 3월 평균기온, 능선대계곡비, 모암, 8월 평균기온, 해발고도, B층 토심)가 독립변수로 사용되었으며 결졍계수는 0.466으로 분석되었다. 지위지수는 12부터 18까지 분포하였으며, 남부권역의 현존 삼나무 임분 중 지위지수 중(16)이상인 적합성 비율은 20.1%로 나타났고 면적은 225,263.8ha로 산출되었다. 주로 내륙의 해발 600m 이하인 계곡부 또는 풍노출도가 낮은 곳이 적지인 것으로 나타났으며 전라북도의 변산반도, 임실, 정읍, 순창, 전라남도의 담양, 곡성, 화순, 영암, 경상남도의 함양, 산청, 합천, 제주도의 한라산 동사면 및 남사면의 산복 지역이 이에 해당되는 것으로 조사되었다. This study was conducted to develop new forest resources model for Climate change. For this, it was performed to develop site index equations and estimate productive areas for Cryptomeria japonica of major species in the Southern area using environmental factors. The 67 environmental factors about Cryptomeria japonica, 626 sites were obtained form a Forest Site Digital Map and Automatic Weather System(AWS). It was regressed on site index equations. Eight environmental factors(A horizon soil color, B horizon soil color, March mean temperature, ridge-valley rate, country rock, August mean temperature, altitude above sea level, B horizon soil depth) were selected as independent variables, the result showed that the coefficients of determination were 0.466. The site index was ranged from 12 to 18. Compliance ratio about the site index more than 16 was showed 20.1%, and the area was calculated 225,263.8ha. Right land was valley about 600m below sea level in inland or area of low wind exposure.