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신만용 ( Sin Man Yong ),정동준 ( Jeong Dong Jun ),신창섭 ( Sin Chang Seob ) 한국농림기상학회 2004 한국농림기상학회지 Vol.6 No.1
N/A This study was conducted to provide a national forest management method for natural Pinus densiflora forest stands in central South Korea based on growth characteristics and water relations. Average stand volume per hectare was 259.3㎥ in the pine study site. Basal area, volume, annual mean increment and periodic annual increment of DBH for 10 years at each slope aspect appeared to decrease as the aspect shifts from north to south. Stems per hectare showed the lowest value at the northern aspect. Maximum water potentials measured between 12 and 14 o`clock were analyzed by aspect and elevation. Water potential of pine decreased as the aspect changed from north to south, and water potential increased at lower elevations. Soil water content for the pine stands tended to decrease as the aspect shifted from north to south. Water potential and soil moisture content were highly correlated. Soil water deficits indicate that pines have a higher moisture requirement on the ridge and the southern aspect.
거리독립 경쟁지수를 이용한 4개 침엽수종의 고사률 추정식의 개발
신만용 ( Sin Man Yong ),이민준 ( Lee Min Jun ),안홍수 ( An Hong Su ) 한국산림과학회 2003 한국산림과학회지 Vol.92 No.6
This study was carried out to develop individual tree mortality equations by using competition index for four coniferous species such as Pinus densiflora in Gangwon province, Pinus densiflora in the central Korea, Pinus koraiensis and Larix leptolepis. The competition index was estimated by distance-independent model developed by Schroder and Gadow and then used as an independent variable for developing adequate individual tree mortality model by coniferous species. Seven candidate models for individual tree mortality by species were compared and evaluated based on three evaluation statistics such as mean difference(MD), standard deviation of difference(SDD) and standard error of difference(SED). It was found that each species has different model forms for the most appropriate mortality estimation. That is, Pinus densiflorn in Gangwon province is best fit to model Ⅱ , Pinus densiflora in the central Korea is best fit to model N. Pinus koraiensis is best fit to model V and Larix leptolepis is best fit to model Ⅳ. The estimated fit indices for the mortality equations of each species ranged from 0.70 to 0.83, which is relatively high in terms of mortality estimation. Therefore, it is concluded that the mortality equations developed in this study could be useful and applicable for the estimation of tree mortality by species.
장용석 ( Jang Yong Seog ),신만용 ( Sin Man Yong ),정동준 ( Jeong Dong Jun ) 한국농림기상학회 2004 한국농림기상학회지 Vol.6 No.1
N/A This study investigated the structural characteristics of Taxus cuspidate communities on Mt. Hambaek. The vegetation consisted of 9 species in the T₁(tree) layer, 35 species in the T₂(subtall tree) layer, 28 species in the S(shrub) layer, and 69 species in the H(herb) layer. The dominant species of the T₁ layer was Taxus cuspidata and that of the T₂ layer was Acer tschonoskii var. rubripes. The dominant species of the S layer was Tripterygium regelii, and the dominant species of the H layer was Pseudostellaria palibiniana. The diameter distribution of the dominant five species in the T₁ and T₂ layers indicates that these Taxus cuspidata forests may be gradually dominated by Quercus mongolica and by Tripterygium regelii. The composition of biological type was Ph-D₁-R_(5)-e.
중부지방 굴참나무림의 입지환경에 따른 생장 및 수분생리 특성에 관한 연구
정동준 ( Jeong Dong Jun ),신만용 ( Sin Man Yong ) 한국농림기상학회 2003 한국농림기상학회지 Vol.5 No.4
N/A This study was conducted to provide a rational forest management method for a natural oak (Quercus variavilis) forest stand in the central part of South Korea based on characteristics of growth and water relation parameters. Average volume per hectare was 175.1 ㎥ in the study site of oak stands. Basal area and volume of each direction appeared to increase as the slope direction moves from north to south, but annual mean increment and periodic annual increment of DBH for 10 years showed the lowest value at the southern aspect. Maximum water potentials measured between 12 and 14 o`clock were analyzed by direction and elevation in the oak stands. Water potential of oak decreased as the slope changed from the north to the south aspect, and water potential increased at lower elevations. Soil water content for the oak stands tended to decrease as the aspect shifted from north to south. Water potential and soil moisture content were highly correlated. It appears that oaks have a higher moisture requirement at the southern aspect, because of stand density related to intraspecific competition.
입지환경에 따른 잣나무 차대검정림 하층식생 구조의 특성
정동준 ( Jeong Dong Jun ),김홍률 ( Kim Hong Lyul ),신만용 ( Sin Man Yong ) 한국농림기상학회 2003 한국농림기상학회지 Vol.5 No.3
N/A This research was conducted to investigate about structural characteristics of vegetation by change of the environmental factors for prolific open-pollinated progeny forest in Pinus koraiensis stands. Stand slope of Kapyung area was slower than Youngdong area. On the other hand, contents rate of the soil chemical properties in Kapyung was lower than Youngdong area. And relative intensity of light was higher Youngdong than Kapyung area. On the whole, growth of the Pinus koraiensis was more dominant Kapyung area than Youngdong Analysis result of the relative density, - frequency, - coverage and importance value to shrub layer in each local stands, Quercus mongolica and Quercus acutissima were dominant species in Kapyung area. Dominant species In Youngdong area was Quercus acutissima. In Kapyung area, appearance species of the vegetation layer was consisted that live in moist soil and shaded lot. Youngdong area showed fewer species than Kpyung area. Species diversity of shrub and vegetation layer in Kapyung and Youngdong area was higher than Youngdong. This result was judged by slope difference between each areas. Kapyung area need enforce thinning and Youngdong area conduct tending management on shrub layer.
경기,충청지역의 수치 산림입지도를 이용한 주요 수종의 산림생산력 추정에 관한 연구
구교상 ( Gu Gyo Sang ),김인호 ( Kim In Ho ),정진현 ( Jeong Jin Hyeon ),원형규 ( Won Hyeong Gyu ),신만용 ( Sin Man Yong ) 한국농림기상학회 2003 한국농림기상학회지 Vol.5 No.4
N/A This study was conducted to develop site index equations by main species grown in Gyunggi and Chungcheong provinces using environmental factors obtained from a digital forest site map. For this, 28 environmental factors were regressed on site index by species. Four to five environmental factors by species were selected as independent variables in the best site index equations (coefficients of determination greater than 0.91). For these site index equations, three evaluation statistics, mean difference, standard deviation of difference, and standard error of difference, were applied to the data set. Site index equations by species relationships developed in this study effectively estimate forest productivity in the study area. However, the site index equation of Larix leptolepis showed a larger than expected bias between the estimated and the measured site index. The reason is not clear in this situation, but might be because of the small sample set. It will be necessary, therefore, to conduct more studies to determine the exact reason. It is also expected that the site index equations with a few environmental factors as independent variables could provide valuable information about species well suited to given site conditions. Site index equations for other species should be developed to establish a rational policy about the selection of best species for site conditions.