• Journal of Korean Society of Forest Science
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• v.96 no.3
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• pp.362-368
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• 2007

This study was conducted to estimate merchantable volume and yield per diameter (DBH) class of Pinus koraiensis and Larix kaempferi. Stem volume of trees in each diameter class was calculated using the existing equations for taper and height curve. Saw logs and pulpwood volume were then estimated from the stem volume in each diameter class. The final step was to estimate merchantable volume and yield from saw logs, assuming saw logs were used for lumber (boards or dimension products) production only. The results showed that the stem volume of Larix kaempferi was 23~38% higher than that of Pinus koraiensis at the same diameter classes. Both species were able to produce saw logs from the diameter class of 18 cm. Saw logs and pulpwood yield for both species rapidly increased due to the size limitation on small end diameter. This yield reached a maximum of 90% and 88% at 26 cm and 38cm diameter class, respectively, for Pinus koraiensis and Larix kaempferi. Lumber yield estimated for board products ranged from 23% to 56%. In the case of dimension products, Lumber yield became significantly smaller as saw logs were used for larger dimension products. These results can be used for calculating merchantable volume and economic value of trees, as well as determining final lumber products.

• Korean Journal of Environment and Ecology
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• v.30 no.2
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• pp.214-227
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• 2016

This study was conducted to classify the vegetation structure of the Geumsan in Namhae-gun. Using the phytosociological method and DCCA ordination, the vegetation was classified into 10 communities of natural forests (Quercus serrata, Carpinus tschonoskii, Q.mongolica, Pinus densiflora, P.thunbergii, C. turczaninowii, Q. variablis, Zelkova serrata, C.laxifora and Corylopsis gotoana var. coreana) and 2 communities of plantation forests (Chamaecyparis obtusa and Cryptomeria japonica). Among the communities other than the plantation forests, the importance value of Q. serrata (45.7) was found to be the highest. According to the results of DBH analysis among the species with high importance values, Q. serrata, Q. mongolica and C. tschonoskii showed normal patterns in the size-frequency distribution, suggesting that these species will continue to hold their current dominance. The average soil pH in the communities ranged from 4.28 to 4.76. The results of DCCA ordination analysis showed that Q. serrata was evenly distributed in the high and low elevation habitats. P. thunbergii and P. densiflora communities were mainly distributed in the lowest elevation habitats on the southern slope.

• Journal of Korean Society of Forest Science
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• v.90 no.6
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• pp.673-682
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• 2001

The objective of this study was to monitor vegetation development process after timber harvesting at (Mt.) Baekwoonsan Seoul National University Forests, Korea. Two monitoring plots were established in 1994 and woody plant were monitored from 1994 to 1999. Vegetation development pattern during last six years(1994-1999) after timber harvesting were as follows; Styrax obassia, Styrax japonica and Lindera erythrocarpa as of the existing tree were competitive species in the first year after clearcut, and Styrax japonica and Lindera erythrocarpa as of sprout tree) and Aralia elata as of seedling were dominant species in the sixth years after clearcut. Species diversity indices of harvested forest interior was decreased at the southwestern slope and increased at the northeastern slope. According to DBH distribution pattern, No. of individuals of Lindera erythrocarpa and Aralia elata showed vigorous growth in the sub-canopy layer and then Styrax japonica, Quercus serrata, Maackia amurensis, Lespedeza maximowixzii, Lindera obtusiloba, Staphylea bumalda, Clero-dendrum trichotomum, Weigela subsessilis, in order showed good growth in the sixth year after clearcut. Lindera erythrocarpa with a reversed J-shaped curve pattern by DBH class will be increased while Aralia elata with a J-shaped curve pattern will be decreased.

• Journal of agriculture & life science
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• v.46 no.5
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• pp.1-10
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• 2012

This study analyzed on the characteristics of vegetation structure, species composition and DBH class distribution in order to conservation and effective management for Taxus cuspidata community in Mt. Seorak, Mt. Balwang, Mt. Taebaek, and Mt. Odae. The vegetation in upper, subtree and shrub layer was consist of 11, 22, 33 species in Mt. Seorak, 15, 21, 33 species in Mt. Balwang, 10, 23, 36 species in Mt. Taebaek, and 14, 30, 32 species in Mt. Odae. As a result of importance value at all study sites, T. cuspidata and Abies nephrolepis in upper layer, T. cuspidata, A. nephrolepis and Acer komarovii in subtree layer, and Tripterygium regelii in shrub layer were high, respectively. Species diversity in upper and subtree layer at all study sited were ranged 0.834~1.234 and 1.125~1.329, respectively. According to the DBH class of major three species, T. cuspidata in Mt. Odae site showed a reverse J-shaped curve, which was estimated that T. cuspidata community of this site might be maintained continuously as a stable state.

• Journal of agriculture & life science
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• v.46 no.6
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• pp.33-41
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• 2012

This study was conducted to provide the informations for conservation and effective management of Picea yezoensis community in Mt. Deogyu and Mt. Gyebang. The vegetation of tree, subtree and shrub layer was consist of 8, 20, 26 species in Mt. Deogyu, and 12, 23, 33 species in Mt. Gyebang. Importance value by layer P. yezoensis, Betula ermanii, Abies koreana at tree layer, B. ermanii, Quercus mongolica at subtree layer, and Sasa borealis at shrub layer in Mt. Deogyu, and P. yezoensis, B. ermanii, Abies nephrolepis at tree layer, Acer komarovii and A. ukurunduense at subtree layer, and Tripterygium regelii at shrub layer in Mt. Gyebang were high, respectively. Species diversity in Mt. Deogyu and Mt. Gyebang were 0.779 and 0.984 at tree layer, 1.052 and 1.161 at subtree layer, and 0.823 and 1.304 at shrub layer, respectively. According to the DBH class of major species, P. yezoensis in Mt. Deogyu showed a reverse J-shaped curve, which was estimated that P. yezoensis community of this site might be maintained continuously as a stable state.

• Journal of Korean Society of Forest Science
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• v.110 no.4
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• pp.590-600
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• 2021

This study compared the stand structure of Abies koreana forests between Mt. Jirisan and Mt. Hallasan by analyzing DBH distribution, stem vitality, crown structure, importance value, species diversity, and DCA. The data were acquired through the national long-term ecological research project conducted by the Ministry of Environment. In the comparison of DBH class distribution, the stem density of A. koreana with DBH < 20 cm was higher in Mt. Hallasan than that in Mt. Jirisan; however, the stem density of A. koreana with DBH > 20 cm was higher in Mt. Jirisan than that in Mt. Hallasan. For A. koreana stem vitality, the ratio of alive standing was higher in Mt. Jirisan (72.0%) than in Mt. Hallasan (60.7%), whereas the ratio of alive leaning was higher in Mt. Hallasan (10.2%) than in Mt. Jirisan (1.1%). A. koreana stand in Mt. Jirisan was a mature stand with four evenly developed and distinct layers, whereas the tree layer in Mt. Hallasan was less than 10 m and the stand had three layers without a subtree layer. Mt. Hallasan's importance value of A. koreana was 39.4% higher than Mt. Jirisan's importance value of 26.6%. The species diversity of the A. koreana community of Mt. Jirisan was 2.52 times higher than that of Mt. Hallasan, which was 1.58. DCA results revealed that the average distance between Mt. Jirisan and Mt. Hallasan was relatively distinguished, and the degree of scattering of species composition of Mt. Jirisan was relatively dense compared with that of Mt. Hallasan.

• Korean Journal of Environment and Ecology
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• v.9 no.2
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• pp.156-165
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• 1996

To investigate the forest structure and to suggest the management of vegetation landscape in Noinbong area, Pdaesan National Pa, twelve plots were set up and surveyed. According to the acalysis of classification by TWINSPAN, the community was divided by two groups of Carpinus laxiflora - Quercus mongolica community and the other is Betula costata - schmidtii - C. laxiflora community. It was found out that the successional stage of Noinbong forests was climax and introduced-climax by the analysis of species structure, similarity index and species diversity. The number of individuals was about 120~130 and species was 17 per 100m$^{2}$. Through the analysis of basal area and DBH class distribution, it was estimated that C. laxiflora, B. costata, and B. schmidtii will be clmax species instead of Q. mongolica in tree layer, and in the subtree layer, Acer pseudo-sieboldianum will be dominant species.

• Journal of Korea Foresty Energy
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• v.19 no.2
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• pp.79-85
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• 2000

Mortality patterns ad changes of vegetation in newly formed gaps were investigated to examine the succession process of Pinus densiflora forest located at Mt. Worak. The main findings from this study were as follows: ⑴ The forest was dominated by P. densiflora and Quercus variabilis in the oversotry, while Q. mongolica, Q. serrata and Fraxinus sieboldiana in the mid-story. ⑵ In all study areas, the standing dead type was the most common factor influencing gap-forming mortality. ⑶ DBH analysis showed that Pinus densiflora community was replaced by Quercus variabilis community first, and then by quercus mongolica and quercus serrata community. ⑷ Seedlings of P. densiflora were discovered only at dry sites of the gap.

• Korean Journal of Environment and Ecology
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• v.12 no.2
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• pp.138-146
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• 1998

Ten plots were established to study the vegetation structure of the Songinbong virgin forest in Ullungdo. It was classified into three communities Fagus crenata var. multinervis commnunity, Acer okamotoanum-Fagus crenata var. multinervis community, and Acer okamotoanum community. Shannon's diversity indicies of this area were not high(0.5150~0.8437), due to the geographical and vegetational characteristics. Considering the community structure(importance value, distribution of DBH class, and so on), the vegetation of the Songinbong virgin forest are thought to be stable continuously. With the analysis of plant growth type, it was presumed that Acer okamotoanum have increased after artificial disturbances in this area where Fagus crenata var. multinervis had been dominanat.

• Korean Journal of Environment and Ecology
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• v.8 no.2
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• pp.107-120
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• 1995

To investigate the forest structure of Chuwang valley of Chuwangsan National Park, thirty plots were set up and surveyed. Importance values, DBH class distribution, species diversity indices, DCA Ordination, CCA ordiantion and TWINSPAN classification were used for vegetational structure analysis. Pinus densiflora Quercus serata, Q. mongolica, Q. variabilis were appeared to be dominant species in thirty plots. According to the analysis of classification by TWINSPAN, the thirty plots divided four groups. Groups were Q. mongolica-P. densiflora-Carpinus laxiflora community(I), P. densiflora-Q. variabilis community(II), Q. serrata-Q. variabilis community(III), broad-leaved mixed community(IV) Species diversity(H') of investigated area was calculated 1.17~l.32. The successional trend was seemed to be from P. densiflora to Q. spp. in the canopy layer.