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지구의 잠재자연식생분포를 추정하기 위한 최적구면보간법의 개발
차경수(Gyung Soo Cha),락합공야(Kamiya Ochiai) 한국산림과학회 1997 한국산림과학회지 Vol.86 No.1
As the first step to estimate the potential natural vegetation distribution of the globe, the best spherical interpolation method was developed to the temperature and precipitation which have close relation to the distribution pattern of world natural vegetation. For developing the interpolation method, a named Light Climatic Dataset composed of 1,060 stations around the globe was randomly divided into halves of feeding side and target side. The discrepancy between the observed and estimated values at the target stations was compared with combinations of parameters and methods. The estimated values were calculated to each combination which is all-out, constant radius and constant station methods in the selection of the feeding stations, n square reciprocal and negative exponential functions in weighting function of distance between feeding stations and each target, and oval weighting in direction of the feeding stations from each target. As a result, it turned out that the spherical interpolation with negative exponential weighting function fed from the constant radius stations ovally weighed yields the best estimates both for temperature and for precipitation. The parameters for temperature are 30°in constant radius, 0.78 in negative exponential function and 0.4 in oval weighting, and for precipitation are 30°, 0.53 and 0.4, respectively.
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차경수 ( Gyung Soo Cha ) 한국산림과학회 1998 한국산림과학회지 Vol.87 No.3
To offer the basic information for sustainable production of forest resources and conservation of the global environment, change in potential natural vegetation (PNV) associated with climate change due to doubling atmospheric carbon dioxide (2×CO₂) was estimated with the global natural vegetation mapping system based an Koppen scheme. The system interpolates climate data spherically to each grid cell, determines the vegetation types onto the grid cell, and produces potential vegetation map and area on the globe and continents. The climate data consist of the current, (1×CO₂) climate prior to AD 1958 observed at some 2,000 stations and the doubling (2×CO₂) climate estimated from Meteorological Research Institute of Japan. The vegetation cone under the 2×CO₂ climate scenario expanded mainly toward the poles due to the rise in temperature. The changed PNV area on the globe amounts to 1/3 (4.91 billion (G) ha) of the total land area (15.04 Gha). Kappa statistic for judging agreement between the patterns of vegetation distribution under 1×CO₂ climate and 2×CO₂ climates shows good agreement (0.63) for the globe as a whole. The most stable areas are desert and ice. The potential forest area (PFA) was estimated at 6.82 Gha of the land area in 2 × CO₂ climate scenario. In terms of continental changes in PFA, North America and Asis are increased under the 2×CO₂ climate. However, the potential forest arms of the other continents are decreased by the climate. Europe has no change in the PFA. Especially, the expansion of desert area in Oceania would be accelerated by the 2×CO₂ climate.
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이광남,차경수 ( Kwang Nam Lee,Gyung Soo Cha ) 한국산림과학회 1987 한국산림과학회지 Vol.76 No.4
The research was carried out to investigate the related phenomena, the latent structures and synfhetical characteristics in various growth factors of Phyllostachys bambusoides Sieb. et Zucc. growing at Damyang gun, Chollanamdo, using multivariate analysis. 1. By synthetical characteristics in canonical correlation between height-growth factor group and diameter-growth factor group, the former was determined by the culm height (x₁), and the latter by the. diameter of the largest internode(x_7). And for those between quantitative growth factor group and qualitative growth factor group, the former was determined by the surface area(x_(10)), and the latter by the diameter of the largest internode (x_7). 2. The ten growth factors of bamboo culm were simplified by two principal components on the basis of accumulated proportion aimed at 90%. The first principal component(Z₁) as a $quot;size factor$quot; showed high correlation with growth factors except eye-height diameter(x_5). The second principal component (Z₂) as a $quot;shape factor$quot; showed high correlation only with x_5. 3. The bamboo culm, and the latent phenomenon between their growth factors could be determined by two common factors showing high communality(94.16%). The ten growth factors can be grouped into two attribute factors: quantity and quality. 4. The bamboo culms can be classified into five types: total, volume, shape-quality, inferior and middle.
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지구상의 잠재삼림면적을 추정하기 위한 적정 식생도제작 시스템의 선발
차경수 한국임학회 1997 한국산림과학회지 Vol.86 No.1
The optimum global natural vegetation mapping(GNVM) system was selected as a series of the study to estimate potential forest area of the globe. To select the system, three types of GNVM systems which are simple system with Light Climatic Dataset(LCD), altitude-allowed system with LCD and altitude-allowed system with Heavy Climatic Dataset(HCD) were established and compared. The three GNVM systems spherically interpolate such spotty climate data as those observed at weather stations the world over onto 1°× 1°grid points, product vegetation type classification, and produce a potential natural vegetation(PNV) map and a PNV area. As a result of comparison with three GNVM systems, altitude-allowed LCD system represented natural vegetation distribution better than other versions. The difference between the simple system versus the one with altitude allowance indicated that the simple version tends to over-represent the warmer climate areas and under-represent cold and hostile climate areas. In the difference between altitude-allowed versions of LCD and HCD, HCD version tended to overestimate moist climate areas and to underestimate dry climate areas.
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氣象條件, 不快指數, 曜日 및 週別에 根據한 백아산 自然休養林의 訪問者數의 豫測
車璟洙 全南大學校 農業科學技術硏究所 1997 農業科學技術硏究 Vol.32 No.-
自然休養林을 效率的으로 管理·運營하기 위한 基礎情報를 提供하기위한 첫 段階로서, 백아산 자연휴양림의 8月 訪問者 數를 氣象條件, 不快指數, 曜日 및 週別의 變化에 根據하여 豫測했다. 그 결과 자연휴양림의 방문객수에 미치는 影響은 요일이 가장 크게 작용한 반면에, 기상조건은 큰 영향을 미치지 못한 것으로 나타났다. 요일에 있어서는 金, 土, 日曜日인 주말이, 週別에 있어서는 첫째와 셋째주가, 기상조건에 있어서는 맑음이, 불쾌지수에 있어서는 낮음이 자연휴양림의 방문객수를 增大시키는 要因으로 作用했다. 또한, 기상조건, 불쾌지수 및 週別에 근거한 曜日別 방문자수의 추정은 어느 정도 가능할 것으로 사료된다. As the first step to offer the basic information for the effective management of recreation forest, the number of visitors in August at Paeka-san recreation forest was estimated by "Quantification theory type I" based on the factors such as weather conditions, discomfort indices and times (days and weeks). The factors were divided into fine, cloud and rain in weather conditions, high and low in discomfort indices, Sunday, monday, Tuesday, Wednesday, Thursday, Friday and Saturday in days, and 1st, 2nd, 3rd, 4th and 5th in weeks. As the result of comparison of the number of visitors with the factors, the impacts of times on the number of visitors were higher than those of the weather conditions and discomfort indices on them. The main factors of the number of visitors were as followd; Friday, Saturday and Sunday in days, 1st and 3rd in weeks, fine in weather conditions, and low in discomfort indices.
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