• Journal of Korean Society of Forest Science
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• v.107 no.3
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• pp.266-277
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• 2018

This study was conducted in clear cutting stands. For the whole-tree yarding operation, a tower-yarder based on excavator with a radio-controlled double clamp carriage was applied to analyze yarding productivity and cost. The productivity and cost of yarding operation was $6.2m^3/SMH$(machine utilization rate, 80.4%) and $13,705won/m^3$, respectively. Although the maximum yarding distance was longer than the previous studies, the setting up time of the tower-yarder was decreased as used straw line. The application of the radio-controlled double clamp carriage improved productivity and reduced costs. Based on the fuel log and growing stock($137.0m^3/ha$), the minimum production($m^3$) and area(ha) were $558.3m^3$ and 4.1 ha for Pinus rigida stands and $433.7m^3$ and 3.2 ha for Quercus mongolica stands, respectively. Based on the this study, it will be possible to select an efficient yarding machine by accumulation of data on minimum production and area for many machines in various harvesting sites.

• Korean Journal of Agricultural Science
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• v.9 no.2
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• pp.494-506
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• 1982

The community structure and dynamic succession of forest were determinated on the quadrat plots selected randomly at the Mt. Bomun. The plot size was $20{\times}20m$, and analysis of vegetation and soil 'data we re adapted reciprocal averaging(RA) ordination method. 1. The numbers of tree species were twenty, and dominant species were Quercus variabilis, Pinus densiflora, Alnus hirsuta, and Pinus rigida. 2. The forest of Mt. Bomun was found to be composed of Pinus rigida community and Quercus-Pinus community through RA ordination method. 3. The community of Quercus variabilis was assumed to be dominant in the succession of forest. 4. The soil factors, such as total-N, $NO_3$, $NH_4^+$, $P_2O_5$, organic matter, C. E. C., pH, $K^+$, $Ca^{{+}{+}}$ and $Mg^{{+}{+}}$, were analyzed. Total-N, $NO_3^-$, $NH_4^+$, and $P_2O_5$ were assumed to be the main factors of the soil.

• Korean Journal of Environment and Ecology
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• v.5 no.1
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• pp.54-67
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• 1991

To investigate the structure of the plant community of Daewon valley forest in Mt. Chiri, eighty-nine plots were set up by the dumped sampling method. The classification by TWINSPAN and DCA ordination were applied to the study area in order to classify item into several groups based on woody plants and environmental variables. The classification had been successfully overlayed on an ordination of the same data using DCA. The plots can be classified into five groups by TWINSPAN and DCA. There are Pinus densiflora community. Quercus variabilis-Q. serrata community. Carpinus laxiflora community. Q. monogolica community and Cornus controversa-Q. mongolica community. The successional trends of tree species by both techniques seem to be from P. densiflora through Q. variabilis, Q. serrata to C. laxiflora on the low altitude and from Q. mongolica to C. controversa on the high altitude in the canopy layer. As a result of the analysis for the relationship between the stand scores of DCA and environmental variables. they had a tendancy to increase significantly from the P. densiflora community to C. laxiflora community that was soil moisture. the amount of soil humus and soil nutrients.

• Korean Journal of Environment and Ecology
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• v.18 no.4
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• pp.382-391
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• 2004

This study was conducted to establish the effective and systematic counter plan of conservation by analyzing vegetation on Korean endemic plants and rare and endangered plants, Abeliophyllum distichum, habitats and to present the raw data and direction on counter plan of restoration. The dominant species of tree layers were Platycarya strobilacea(Goesan-gun Chujeom-ri I), Pinus densiflora(Goesan-gun Songdeok-ri II and Yulji-ri III), Robinia pseudo-acacia(Yeongdong-eup Maechon-ri IV), Quercus variabilis(Jincheon-gun Yongjeong-ri V) and Pinus densiflora$.$Quercus variabilis(Buan-gun Junggye-ri Ⅵ). Subtree layers were dominated by Quercus dentata(1st site), Quercus serratu(2nd site), Quercus acutissima(3rd site), Robinia pseudo-acacia(4th site), Zelkova serrata(5th site) and Quercus variabilis(6th site). And the dominant species of shrub layers were Lindera obtusiloba(1st and 5th site), Lespedeza bicolor(2nd site), Stephunandra incisa(3rd site), Quercus aliena(4th site) and Rhododendron schlippen-bachii(6th site). The dominant species of herb layers were surveyed Humulus japonicus$.$Pueraria thunbergiana(1st site), Oplismenus undulatifolius(2nd and 4th site), Carex siderosticta$.$Pueraria thunbergiana(3rd site), Streptolirion cordifolium$.$Humulus japonicus(5th site) and Sasa borealis(6th site). Among the surveyed sites, the Goesan-gun Yulji-ri supremely abounded in species and individuals, and there was surveyed each 21 species and 116 individuals. As well, this site showed the highest H'(1.123) and H'$_{max}$(1.322). Therefore, Goesan-gun Yulji-ri formed diverse vegetation and Yeongdong-eup Maechon-ri and Buan-gun Junggye-ri showed relatively poor vegetation.ation.

• Korean Journal of Environment and Ecology
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• v.30 no.4
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• pp.793-799
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• 2016

This study examined Platanus orientalis and Ulmus davidiana planted in downtown parks to identify the correlations among microclimatic factors such as temperature in the crown, air flow, and wind speed. For the field survey, measurements were taken at 1 hour intervals from 09:00 am to 06:00 pm in August. For the measurement of microclimatic factors, data on temperature, light intensity, air flow, and wind speed were collected using a quantum sensor (PAR Quantum Sensor SKP215), a precision thermometer (Pt1000-Sensor), and a combination anemometer (1467 G4 & HG4). The results of the analysis demonstrated that both Platanus orientalis and Ulmus davidiana, showed a greater cooling effect inside the crown as compared with the outside temperature. The cooling effect inside the crown was more evident with air flow and wind speed factors. With relation to wind, the inner temperature of the crown of Platanus orientalis decreased due to air flow while that of Ulmus davidiana decreased due to wind speed. With no wind, the average variation in temperature inside the crown was $-0.9^{\circ}C$ for Ulmus davidiana and $-0.958^{\circ}C$ for Platanus orientalis, indicating that Platanus orientalis was relatively more effective in lowering the temperature of the planting space than Ulmus davidiana. This study is significant because it shows that different tree species have different effects on the microclimate and that factors affecting the formation of the microclimate of trees may vary with species. Further studies on species other than broad leaf trees, such as evergreen trees and shrubs, are required in order to plan the distribution of landscaping trees that are effective in regulating the microclimate within urban green spaces.

• Journal of Korean Society of Forest Science
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• v.104 no.3
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• pp.427-433
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• 2015

This study was conducted to provide a method of establishing two-storied forests by the adjustment of stand structures in natural deciduous forests of Pyeongchang area. Three permanent sampling plots of 0.09 ha were established in study site and some tree variables were measured in each sampling plot before the treatment of two-storied system. Stand attributes and stand structures before treatment were estimated based on the data measured in sampling plots. The results indicate that the current stand status is different from typical stand structures of two-storied forests. A simulation technique was applied to predict stand attributes and stand structures after the treatment of two-storied system. Results suggest that significant time is required to accomplish target stand structures even after applying the treatment of two-storied system. Number of trees in the upper canopy class after treatment was predicted to be 170 trees/ha, which adequately meets the target of two-storied forests. It was predicted, however, that the lower canopy class trees has much less trees compared with the typical stand structures of two-storied forests. This problem could be solved with ingrowth of infant trees over time or by under-planting of tolerant species. It is confirmed that the target growing stock volumes of the upper canopy class should be approximately $150m^3/ha$ considering stand status after treatment. It is predicted that twenty years of conversion period is required to accomplish this goal. The changes in stand structures over time should be assessed based on stand inventory carried out every five years, and additional treatments for inducing two-storied forests should be applied if necessary.

• Journal of Korean Society of Forest Science
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• v.106 no.2
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• pp.150-168
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• 2017

This study was carried out to compare stand structure in Bihwajin basin Samcheok-si, Gangwon-do, Korea for ten years between 2003 and 2014, in which occurred the east coastal forest fire in 2000. Data were collected from 32 quadrates that followed by the analysis of vegetation classification according to plant sociology, importance value by Mclntosh and Curtise, species diversity and similarity index. In the result of vegetation classification, the vegetation unit decreased from 7 units to 4 units, and the number of species groups changed from 11 to 7. As a result of importance value (IV) changes, IV of Quercus mongolica, Q. serrata and Q. variabilis was increased by 6.8%, 5.2% and 2.9% in the order, respectively. However, that of Pinus densiflora was decreased by 2.8%. That of major planted species such as Castanea crenata, Chionanthus retusa, Prunus armeniaca var. ansu, Acer triflorum and Koelreuteria paniculata was reduced. As a result of species diversity, it was increased from 0.252 to 0.287 in tree layer, from 0.252 to 0.434 in subtree layer, and from 1.293 to 1.333 in shrub layer. But that in herb layer was decreased from 1.745 to 1.646. As a result of similarity index, it was 0.78, 0.65, 0.72 and 0.55 by layers that showed most difference in herb stratum. Considering the results, this study would be applied to the ecosystem diagnose and management of forest fire damaged area similar to the investigated area.

• Journal of Korean Society of Forest Science
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• v.106 no.2
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• pp.267-273
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• 2017

This study was conducted to construct a empirical yield table for Pinus densiflora in real forest. Since existing normal yield tables have been derived by studying and analyzing communities in ideal environment for tree growth, those tables provide more over-estimated values than ones from real forest. Because of this, there are some difficulties to apply the tables to empirical forest except for normal forest. In this study, therefore, we estimated stand growth for real forest on P. densiflora as the representative species of conifers. We used 1,957 sample plot data of P. densiflora in central Korea from National Forest Inventory (NFI) system, and analyzed through estimation, recovery and prediction in order by using Weibull function as a diameter distribution model. Weilbull and Schumacher models were applied for estimating mean DBH and mean basel area and it was found that the site index for P. densiflora in central Korea ranges from 8 to 14 at reference age 30. According to site 12 in the stand yield table, the Mean Annual Increment (MAI) of P. densiflora was $4.42m^3/ha$ at 30 years of age. Compared to existing volume table constructed before, it is showed that MAI of this study were lower. According to the paired t-test that is conducted with the gap of volume values between normal forest and real forest by site index and age, the P-value was less than 0.001 which is recognized to have a statistically significant difference. Based on the results in this study, it is considered to be helpful for practical management and management policy on P. densiflora in central Korea.

• Journal of Korean Society of Forest Science
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• v.77 no.2
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• pp.186-192
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• 1988

This study was carried out to estimate the stand form factor that is necessary to estimate stand volume by STRAND method among plotless sampling methods. The data measured for this study were based on the 380 sample plots from Larix leptolepis and 358 sample plots from Pinus koraiensis which were distributed in the region of Kyeongi, Kangweon, Chungbuk, Chungnam, Chun-buk and Kyeongbuk. 1. Stand form factor was highly correlated with in the following order, stand form height, stand average height, average diameter, stand age, distance of stem, and basal area height. 2. The best fitted equation of stand form factor of above two tree species were presented in table 3. 3. Stand form factor tables using estimated equations on the table 3 were prepared and presented in table 4, 5(Larix leptolepis), 6, 7(Pinus karaiensis). 4. The relatioinships between estimated value and actual value were Y=bx, where b approached nearly 1.0, and there were not any significant differences between them. 5. The percentages of estimated error on stand form factor table were ranged from 2.39% to 4.15% in Larix leptolepis and from 1.73% to 2.50% in Pinus koraiensis. Therefore, the stand form factor could be exactly estimated by use of these tables.

• Journal of Korean Society of Forest Science
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• v.84 no.3
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• pp.299-305
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• 1995

Vegetational data from 81 quadrats of Quercus mongolica communities in Mt. Odae and Mt. Jumbong were analysed by applying two multivariate methods : two - way indicator species analysis(TWNSPAN) for classification and detrended canonical correspondence analysis(DCCA) for ordination. The dominant tree species of Quercus mongolica communities were found in the order of Quercus mongolica, Acer pseudosieboldianum. Tilia amurensis, Carpinus cordata, Acer mono, and Fraxinus rhynchophylla. The forest vegetation of Quercus mongolica community was classified into Quercus mongolica, Quercus mongolica - Carpinus cordata, and Quercus mongolica - Abies nephrolepis groups according to the TWNSPAN. The relationships between the distribution of dominant groups for forest vegetation and soil condition in Quercus mongolica communities were investigated by analysing elevation and soil nutrition gradients. Quercus mongolica group was distributed in the low elevation and poor nutrition area of total nitrogen, Quercus mongolica - Carpinus cordata group was distributed in the low elevation and good nutrition area of $Mg^{{+}{+}}$ and $Ca^{{+}{+}}$, while Quercus mongolica Abies nephrolepis group was distributed in the high elevation and poor nutrition area of $Mg^{{+}{+}}$ and $Ca^{{+}{+}}$. The two dominant factors influencing community distribution were elevation and total nitrogen.