• Journal of Korean Society of Forest Science
• /
• v.90 no.4
• /
• pp.445-449
• /
• 2001

The objective of this study was to develop a new technique to control crown form of Hiscus syriacus to be used for an upright street tree with a single stem. Fertilization and raising the clear-bole length were the main treatments to compare the diameter and height growth of this species. The trees maintained with clear-bole length of 100, 150, and 200cm showed diameter growth of 15.7. 13.8, and 10.8mm, respectively, indicating the reduced diameter growth of trees with increasing clear-bole length, which is known as a typical characteristics in tending trees in silviculture. The effects of fertilization was not shown in this study. At the end of the two-year study from 1999 to 2,000, optimum diameter growth was obtained with the treatments of clear-bole length of 80-120cm, or 121-150cm. It is concluded that height and clear-bole length should be considered first in raising Hibiscus syriacus for street trees. Further study may be needed to obtain the effects of fertilization and raising the clear-bole length on uprightness of this species.

• Journal of Korean Society of Forest Science
• /
• v.44 no.1
• /
• pp.36-42
• /
• 1979

A study was conducted on the genetic correlations and simple correlations between some characters of the plus trees of Pinus densiflora. The results can be summarized as follows. 1. Simple correlations height growth by age was measured and high correlation(above r=0.9) were observed. Therefore, early selection seems to be possible in the light of the results made up to 8 years old. 2. Genetic correlation between height and root collar diameter was 0.266 and the correlation between height and branch diameter was 0.091 and 0.391 was between root collar diameter and branch diameter.

• Journal of Korean Society of Forest Science
• /
• v.101 no.4
• /
• pp.722-728
• /
• 2012

Climate change affects all biological processes in terrestrial ecosystems including photosynthesis, plant growth and productivity. This study was conducted to investigate the effects of experimental warming on the growth of Quercus variabilis seedlings. One-year-old Q. variabilis seedlings were planted in control and warmed plots in April 2010. The air temperature of warmed plots was increased by $3^{\circ}C$ compared to control plots using the infrared lamp from November 2010. Shoot height and root collar diameter were measured in March 2011 and June 2012, respectively, and aboveground and belowground biomass were also measured in March 2011 and 2012, respectively. Shoot height and root collar diameter were significantly higher in warmed plots than in control plots, except for root collar diameter in March 2011. Increment (mm) of shoot height and root collar diameter were also higher in warmed plots ($529{\pm}30$, $5.6{\pm}0.5$) than in control plots ($464{\pm}28$, $4.5{\pm}0.4$). However, there were no significant differences between warmed and control plots except for root collar diameter. Increment (g/year) of total, aboveground and belowground biomass were higher in warmed plots ($36.88{\pm}6.52$, $11.91{\pm}3.44$, $24.97{\pm}3.73$) than in control plots ($30.59{\pm}5.51$, $8.73{\pm}1.66$, $21.86{\pm}3.88$), however, the differences were not statistically significant. Higher seedling growth and biomass of warmed plots might be related to the enhanced net photosynthetic rates in spring and the extended growing season.

• Journal of Korean Society of Forest Science
• /
• v.21 no.1
• /
• pp.35-38
• /
• 1974

In order to investigate reproductive capacity of genus Lespedeza 5 spp,; L. bicolor, L. maximowiczii, L. japonica var. intermedia, L. angustifolioides, and L, cyrtobotrya, their hights, diameter at the ground level, and the number of sprouts were compared with each other at the end of October during investigating years from 1970 to 1972. For measuring of invested items, 6 stocks which the one-year aged stem were cut above ground were randomly planted per square meter with six replications at the spring of 1970. After hights, diameter, and the number of sprouts were measured at the end of October every year, the stem were cut above ground at the end of November from 1970 to 1972. The results are as follows: 1. The reproductive of the stems showed statistically significant differences at 1% level by species and stock ages. L. bicolor showed the best reproductive capacity of them. 2. The sprouting ability was revealed that L. maximowiczii showed the best of them. 3. The reproductive capacity of stem, diameter, and number of sprouts increased with aging of stock up to 4 years on the investigated 5 species.

• Ecology and Resilient Infrastructure
• /
• v.6 no.4
• /
• pp.295-303
• /
• 2019

This study investigated the effects of various cultivation pots on Betula platyphylla var. japonica seedlings in order to select suitable pots for the production of healthy seedlings for the ecological revegetation. We used six types of the pots natural pot, natural pot with inside 5 mm width root turning bump, natural pot with inside 10 mm width root turning bump, negative-phototropism pot, negative-phototropism pot with inside 5 mm width root turning bump, and negative-phototropism pot with inside 10 mm width root turning bump. As greenhouse cultivation provided a high level of control of irrigation and temperature, the seedlings did not show any significant differences in plant height, number of branches, and diameter at root collar, but showed a significant difference in root growth among the different types of pots. The root growth was best in the negative-phototropism pot. In the negative-phototropism, the roots grew in a vertical shape, while they grew abnormally in a spiral shape in the natural pots. In outdoor cultivation, the growth of seedlings showed significant differences according to container types. The seedlings grown in specially manufactured negative-phototropism pots were most excellent in all of the height, number of branches, diameter at root collar and root growth. As for the seedlings grown in the negative-phototropism pots, their roots grew vertically and thus their rooting was well established after they were transplanted outdoor. A size of less than 5 mm ridge installed in the negative-phototropism was found to be appropriate for the seedling growth. These results showed that the negative-phototropism pot would be best suitable for the growth of Betula platyphylla var. japonica seedlings and for the production of seedling for ecological revegetation.

• 대한위암학회:학술대회논문집
• /
• 2003.11a
• /
• pp.55-55
• /
• 2003

• Proceedings of the Korean Institute of Surface Engineering Conference
• /
• 2009.10a
• /
• pp.112-114
• /
• 2009

화학약품 사용에 의한 환경오염을 근원적으로 해결하고, 친환경 건식표면처리 스테인리스 홀로그램 등의 친환경 건식표면처리 소재개발 기술경쟁력 향상에 기여하는 국내, 해외의 기술동향과 정보자료를 수집하여 수요자에게 심층 분석을 제공하고자 한다.

• Journal of Forest and Environmental Science
• /
• v.24 no.2
• /
• pp.111-118
• /
• 2008

Pull-out resistance tests of root were carried out for 7 shrub species which are mainly used greening of deteriorated forest slope. Mean pull-out resistance forces of Aralia elata, Salix koreensis and Stephanandra incisa were 37.26 kgf, 34.56 kgf and 26.00 kgf, respectively. The pull-out resistances were high as collar diameter and volume of the root increased. Correlations between root collar diameter and root volume were high in Rubus crataegifolius, but on the other hand, the correlation was lowest in Zanthoxylum schinifolium. There were significant differences in pull-out resistance by root collar diameters, and the difference of pull-out resistance by species showed only below 20 ml root volume.

• 대한두경부종양학회:학술대회논문집
• /
• 1994.11a
• /
• pp.17.2-18
• /
• 1994

• Journal of the Daesoon Academy of Sciences
• /
• v.12
• /
• pp.45-64
• /
• 2001