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申萬鏞 경희대학교 부설 식량자원개발연구소 1990 硏究論文集 Vol.11 No.-
As a method of testing aptness for a specific regression model, the lack of fit test was employed. Using this method, height-DBH data from 84 plots of Korean White Pine plantation in GaPyung, Kyug-Ki Province were analyzed to examine whether or not a log linear regression model fits well to the given data. A log linear regression model was appropriate for height-DBH relationship of Korean White Pine plantation in GaPyung, Kyung-Ki Province. The resulting prediction model was ln(H)=3.34+14.67 D^(-1). The same linear model could be tarnsformed to the hieght-DBH curve such as H=28.22 e^(14.671D). Using this nonlinear regression model, it could be predicted that Korean White Pine planted in GaPyung locality has the maximum height of 28.22 meters.
京畿道 加平地域 잣나무의 地方的 材積表 調製에 관한 硏究
신만용 경희대학교 부설 식량자원개발연구소 1991 硏究論文集 Vol.12 No.-
A statistical technique was presented to develop a local volume table for Korean White Pine plantation in Gapyung, Kyunggi Province. For this, the most appropriate regression model form for individual tree volume was first selected from four cadidate models based on the evaluation statistics. Regression coefficents for the selected model were then estimated using OLS. Another regression equation was also developed to represent height-DBH relationship of Korean White Pine for the plantation. The height factor of independent variable in the individual tree volume equation was then substituted by the height curve equation so that the individual volume was finally estimated by DBH only. The resulting local volume table provided relatively accurate volume estimation. However, the volume of smaller DBH class in the table might be overestimated compared with the existing volume table. This fact might result from the lack of sample data used and the site quality of the plantation in terms of tree growth.
신만용,고영주,이천용,임주훈,전영우 國民大學校 山林科學硏究所 1992 山林科學 Vol.4 No.-
To understand various aspects related to regeneration methods and tending practices for Quercus mongolica-Abies holophylla natural mixed stands, the vertical structure and horizontal distribution of Abies holophylla, the Korean fir, in disturbed mixed stands were investigated. Seedling and sapling advance regenerations of Abies holophylla were found on the forest floor beneath high shade from a mixed broad leaved forest canopy. These seedlings and saplings were showed the suspended growth from and grew very little for an extended time as about 5cm in height with the age of 10 years old, 1.2cm in height with 50 years old, and 2m in height with 60-70 years old. The horizontal distribution of seedlings and saplings of Abies holophylla was subject to restriction by the Sasa borealis(Hack). Makino, condition of soil moisture, boggy ground, and exposed rocks. Because of no appearance of Abies holophylla individual trees between 50 to 110 years old at diameter height(DBH) age(between 100 to 160 years old at collar age)in this stand, we could presume that a disturbance occurred during these periods. However, we could not estimate the magnitude of the disturbance to this natural mixed stand. Silvicultural system associated with regeneration methods and tending practices for this Quercus mongolica-Abies holophylla natural mixed stand are also discussed. These include : 1) possibility of selection method application, 2) time of release from overstory broad leaved tree canopy for growth promotion of Abies holophylla advance regenerations, 3) possibility of Abies holophylla as advance planting for the species of under planting in natural mixed broad leaved forest.
申萬鏞 國民大學校 山林科學硏究所 1996 山林科學 Vol.8 No.-
Stem form is one of very important factors which affect tree growth and volume. A method that can in creases precision of results, but curtail time and cost in data collection and analysis was adopted in this study to estimated stem form for Larix leptolepis which is a major plantation species in Korea. For this, the estimation of breast height form factor and normal form factor by DBH was conducted. In addition, the relationship between the breast height form factor and normal form factor was discussed. The breast height form factor has the tendency of decrease ranging from 0.531 to 0.428 as DBH increases. On the other hand, it was found that the normal form factor become slightly larger as DBH increases and ranges from 0.457 to 0.544. The normal form factor has a fixed relationship with the breast height form factor and can be easily estimated by the relationship.
신만용 國民大學校 山林科學硏究所 1999 山林科學 Vol.11 No.-
This study was to investigate the competition status in natural deciduous stand by using both distance-dependent and distance-independent competition indices. Hegyi's model and the ratio of the subject tree basal area to the average tree basal area were used in distance-dependent and distance-independent competition indices, respectively. Efficiency of the indices for both individual tree and interspecific competition was compared based on the results obtained from t-test. The individual tree competition showed significant difference between distance- dependent and distance-independent models at 1% level. This result means that in heterogeneous stand such as natural deciduous stand both tree size and distances between subject tree and competitors should be considered in estimating individual tree competition. On the other hand, there was no significant difference between two models for interspecific competition. Thus, only tree size without distances information could be used to reveal competition status for species basis. As a result, the distance-independent competition index could be used to select the dominant and codominant species in a stand with various species composition such as natural deciduous stand.