• Journal of the Korean Society of Environmental Restoration Technology
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• v.14 no.2
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• pp.1-10
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• 2011

Six pine trees (Pinus densiflora S. et Z.) at the Euilimji Lake Park in Jecheon were collected to investigate tree ages, growth decline pattern and the years of death. Tree-ring measurement was carried out using the Lintab with a resolution of 0.01mm. Tree age were 80-176 years. Cross-dating between the tree-ring series of each tree and the local chronology from Worak Mountain resulted that four and two trees died in 1998 and 1999, respectively. Three dead trees had only formed earlywood in the outermost tree ring and the others had incomplete latewood. Therefore, it was proven that the former trees died between spring and early summer, whereas the later ones died during late summer and/or autumn. The simultaneous deaths of trees suggest the insect damage and/or drought may be the crucial reason of the death, but frequent reaction woods, which were formed by leaning stem, and scars formed by physical damage may also contribute to the death.

• Korean Journal of Environment and Ecology
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• v.14 no.1
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• pp.46-56
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• 2000

Vegetation structure of $Hwangs\v{o}ng$ Park in $Ky\v{o}ugju$ was investigated to study ecological value and to suggest a desirable management proposal. To do this, twenty plots were set up and surveyed. The $Hwangs\v{o}ng$ Park forest was classified into five plant communities by the DCA technique, which were two types of Pinus densiflora communities, Quercus spp.-P. densiflora, Robinia pseudoacacia and Q. mongolica community. In the diversity analysis, 29 woody species were observed, but species composition was simple. No. of average species is $5.4\pm2.9$ per a plot($100m^2$), and Pinus densiflora is a dominant species in DBH $27\sim47cm$ class. From the results of tree ring and growth analysis, it was found out that pinus densiflora community of $Hwangs\v{o}ng$ Park has a historical and ecological value, but recently the growth rate was decreasing. The management proposal was suggested upon to the above results.

• Korean Journal of Environment and Ecology
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• v.15 no.3
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• pp.237-246
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• 2001

To investigate the forest structure and to suggest the basic data of forest in the Dongwol Valley, the Gyeryongsan National Park, forty one plots were set up and surveyed. According to the analysis of classification by TWINSPAN, the community was divided by seven groups of Carpinus taxinora(I), Styrax japonica(II), Pinus densiflora A type(III), Quercus acutissima(IV), P. densinora-Q. valiabilis(V), p. densinora B type(Ⅵ) and Q. mongolica community(Ⅶ). The structure of communities were investigated using importance value. The survey results were summarized as follows: 1) the results of annual ring analysis revealed that the age of forest in the Dongwol Valley was about 30~50 years old,2) number of the average species was 15.6$\pm$4.7 and number of average individual was 124.9$\pm$36.4 per a plot(100$\textrm{cm}^2$). From the above results, it was anticipated that C. laxiflora will be climax species instead of Q. spp. and P. densinora.

• Korean Journal of Ichthyology
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• v.33 no.1
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• pp.31-36
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• 2021

In order to understand the age and growth characteristics of Pacific anchovy, Engraulis japonicus, the 506 otoliths of individuals collected in the southern waters of Korea in 2004 were analyzed. Monthly age of anchovies was estimated based on the age determined through the year rings and their collection date. The growth parameters obtained using the monthly folk lengths were a theoretical maximum body length of 132.9 mm, a growth coefficient of 0.1079/month and a theoretical age of 0.0262 month when the fork length is zero. The growth equation of von Bertalanffy presented by the growth parameters was L_t=132.9(1-e^{-0.1079(t-1.0262)}). The estimation of growth parameters based on the monthly age established through year ring and collection date was deemed appropriate for understanding the growth characteristics of anchovies.

• Journal of Korean Society of Forest Science
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• v.102 no.3
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• pp.355-364
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• 2013

This study was conducted to investigate the population structure and dynamics of the Picea jezoensis stands which are located in Mt. Gyebangsan and surveyed from March to October 2012. Results showed that the diameter class distribution of P. jezoensis presented a reverse J-shaped distribution pattern with 32 trees less than 10 cm DBH, 20 trees in 10~30 cm DBH, and 11 trees more than 30 cm DBH. It showed seedlings and saplings of P. jezoensis seem to prefer areas with more sun light or with open upper layer. It was also observed that P. jezoensis preferes areas with organic soils and abundant water such as areas around stumps. Also, occurrences of P. jezoensis stands were analyzed through annual mean radial growth of the trees. And the results showed that the growth naturally or artificially occurred approximately on the years 1854, 1915, 1918, 1993 and 2002 years. Most of the gap-makers were classified as standing dead type with 23 individuals (45.1%).

• Journal of Forest and Environmental Science
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• v.7 no.1
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• pp.23-34
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• 1990

Based on the topographical and vegetational indicators on sediment movement of Yongcheon River, the movement occurence years were estimated. 1. The cross sectional shapes of deposits in torrential stream are stepped and even-aged forests tend to be established on each step. 2. Generally the older the forest age is, the higher the height of step from the lowest base tend to become. 3. The ages of trees indicate the year when deposition occured, and so may be useful as plant indicator to get chronological information.

• Journal of the Korea Furniture Society
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• v.23 no.1
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• pp.84-94
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• 2012

We present the species and the dendrochronological dates of Korean traditional furniture in Forest Museum Collection of Korea National Arboretum. Seven of thirteen were successfully dated. Chest with a flap door (84-55-1) was dated A. D. 1623. Others dated were cabinet (83-41-1: A. D. 1759), Chest with a turnover door (83-39-1; A. D. 1801), Cabinet with two horizontal section (88-39; A. D. 1843), Rice chest (82-27-3; A. D. 1849), Cabinet with two horizontal section (83-40-2; A. D. 1877), Chest with a flap door (84-50; A. D. 1918). Most of existing cabinets were made in 1800s. The 84-55-1 chest was one of the earliest pieces of furniture in the collections of Korea museums. The furniture is usually composed one species. The major species was Pinus densiflora. Bedside cabinet (83-41-1) and Cabinet with two horizontal section (88-39) were made from Korean pine (Pinus koraiensis). Becasue they were dated by the tree-ring chronology of Mt. Bekdu, the timber of their boards could be from the area of Mt. Bekdu.

• Journal of Conservation Science
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• v.9 no.1
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• pp.48-52
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• 2000

A hundred wooden foundation piles were found underground during reconstruction for Heungreamun after removing ex-Chosunchongdokbu (ex-Government General of Chosun) building, which was built in 1916, at Kyungbok Palace in Seoul. It is known that larch piles had been collected from the Yaru area near Mt. Baekdu (Changbai). in North Korea. We examined 15 piles for identification of the species and their tree-ring structure. The species is identified as Larix gmelini by microscopic observation. Average diameter of the piles was 27 cm and average age 103 years. We obtained 151 year tree-ring chronology. However, we could not date the exact cutting years because there was no reference chronology yet. When we can obtain chronologies from living trees near the Yaru area, we could make a absolute and longer chronology for studying past history and environments around Mt. Baekdu.

• Journal of the Korean Wood Science and Technology
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• v.36 no.6
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• pp.130-137
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• 2008

In this study cadalene, which is classified into sesquiterpenes constructed with 15 carbons of naphthalene skeleton, was isolated from ethanol extracts of Zelkova wood (Zelkova serrata) using successive silica gel column chromatography. The purified cadalene compound was subjected to structural analysis using HPLC, EI-MS and $^1H$, $^{13}C-NMR$. Its molecular weight was measured to 244 (m/z) and methyl and isopropyl group were attached at C1 and C4 position, as well as hydroxyl group at C7 and methoxyl group at C3 in the naphthalene skeleton, respectively. Yield of 7-hydroxy-3-methoxycadalene amounts to 0.03% based on air dried Zelkova wood powder. It was distributed only in xylem tissues(only in heartwood) of Zelkova wood, not in leaves and bark.

• Journal of the Korean Wood Science and Technology
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• v.45 no.1
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• pp.53-61
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• 2017

In this study, specimens were produced with a column member and a wooden gusset only by inserting an wooden gusset which is a substitute for steel plate into the center of a slit-processed column member. The moment resistance performance of the specimens was compared with that of control specimens that used a steel plate. The measured maximum moments of the specimens produced with GFRP-reinforced wooden laminated gussets and pins were lower by 24% on average compared to the steel plate-inserted specimens, but they showed good toughness. The fracture shape suggests that it was fractured along the annual rings between the pin and the end of the column member. The rigid specimen that integrated a laminated wood and a wooden laminated gusset with adhesive showed 2.8 times greater initial rigidity and 40% greater maximum moment on average compared to the control specimen. The rigid specimens mainly fractured on a glulam around glue line.