• Journal of the Korean Wood Science and Technology
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• 제44권6호
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• pp.890-896
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• 2016

Paulownia tomentosa is one of fast-growing wood species in Korea. In order to evaluate the solid bioenergy properties of Paulownia tree, this study examined the heating value, moisture content (MC), pH and proximate analysis of stem, branch, root, bark and leaf. The heating values of wood parts were slightly higher than those of bark and leaf, and that of branch was the highest among all the samples. The higher moisture content of bark and leaf referred to their lower heating value. Also, the pH of stem, branch and root was similar and lower than those of bark and leaf. The ash content of bark and leaf was much higher than that of wood parts, which is the one of the reasons for effect on the lower heating value and higher pH. While, the volatile matter content (VMC) of bark and leaf was lower than those of wood parts. The bark showed the highest fixed carbon content (FCC), while the FCC of stem was the lowest among all the samples. The obtained results are encouraging that the Paulownia tree could be totally utilized as alternative fuels for bioenergy production.

• 한국자원식물학회지
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• 제18권2호
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• pp.337-342
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• 2005

본 연구는 옻을 채취한 옻나무에서 수피생산량을 파악하기 위하여 옻나무의 직경에 따른 중량과의 관계와 우죽의 중량에 따른 수피와 건피량을 조사한 결과 옻나무중량에 대한 우죽중량의 비율은 평균 $48\%$였는데, 중량이 큰 나무들이 우죽비율이 높게 나타났으며, 옻나무 직경이 최소한 8cm정도는 되어야 우죽에서 1kg이상의 건피를 생산할 수 있는 것으로 분석되었다. 옻나무 우죽의 수피를 측정한 결과 생피무게는 $1.1{\sim}l.5kg$에 해당하는 옻나무가 $43.3\%$로 가장 많았고, 다음은 $0.5{\sim}1.0kg$이 $37.5\%$로 조사되어 전체 우죽의 $80\%$이상이 1.5kg이하인 것으로 나타났다. 또한 생피를 말린 건피의 무게는 $0.6{\sim}1.0kg$에 해당하는 나무들이 $50.8\%$로 가장 많았으며, 다음이 $0.1{\sim}0.5kg$으로 $25\%$로 나타나 전체 옻나무의 $75\%$정도가 1.0kg이하인 것으로 조사되었다. 그리고 우죽중량에 대해 생피중량이 차지하는 평균비율은 $27\%$였으며, 우죽중량에 대한 건피중량의 평균비율은 $16\%$로 측정되었는데, 생피를 건조시켰을 때 평균건피중량은 생피의 $61\%$로 나타나 생피의 수분함유율이 평균 $39\%$로서 건피 1kg을 생산하기 위해서는 우죽 6.25kg이 소요되는 것으로 분석되었다.

• Journal of Forest and Environmental Science
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• 제31권4호
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• pp.267-271
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• 2015

The variations of wood density and mechanical properties of Juniperus polycarpos trees were studied in a natural forest in Iran. Sample disks were taken from each tree to examine wood density and mechanical properties (MOE and MOR) from pith to bark at breast height, 50%, and 75% of total tree height. The analysis of variance (ANOVA) indicated that radial position and height significantly affected all wood properties. The wood density, MOE and MOR were decreased along horizontal position from the pith to the bark and vertical direction from base upwards. Regression analysis showed that modulus of elasticity (MOE) and modulus of rupture (MOR) had a positive correlation with wood density.

• 한국산림과학회지
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• 제77권1호
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• pp.10-16
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• 1988

한국(韓國)의 난대(暖帶)인 전남(全南) 완도군(莞島郡) 남길도(南吉島) 해안(海岸)에 조성(造成)된 상록활엽교목(常綠濶葉喬木)이며 약용자원(藥用資源)으로 활용(活用)되고 있는 후박나무림(林)을 대상(對象)으로 물질생산량(物質生産量)을 조사(調査)한 결과(結果) 지상부현존량(地上部現存量)은 123.708 tons/ha로 추정(推定)되었고 이용가능(利用可能)한 가지수피량(樹皮量)은 1.615 tons/ha로 총수피량(總樹皮量) 8.095 tons/ha의 1/5 정도를 차지하고 있었다. 또한 현존량(現存量) 밀도(密度)는 $1.77ha/m^3$ 엽면적지수(葉面積指數)는 8.08로 나타났다. 지상부(地上部) 년순산량(年純産量)은 16.051 tons/ha/yr로 추정(推定)되었고, 그 구성화(構成化)는 잎이 42.6%, 줄기목질부(木質部)가 32.6%, 가지목질부(木質部)가 21.1%, 줄기수피(樹皮)가 2.5%, 가지수피(樹皮)가 1.2% 순(順)이었다. 생산능률(生産能率)에 있어서 순동화율(純同化率)은 1.384 kg/kg/yr, 간재생산능률(幹材生産能率)은 0.451 kg/kg/yr, 총수피생산능률(總樹皮生産能率)은 0.051 kg/kg/yr, 현존량축적율(現存量蓄積率)은 7.707 kg/kg/yr로 나타났다.

• 한국약용작물학회지
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• 제20권3호
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• pp.159-164
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• 2012

In this study, we investigated the antibacterial activity, antioxidative activity and whitening effect of 75% ethanol extracts from different parts of Prunus sargentii. The total phenolic compound content of the branch extract was 277.92 mg/g as the highest level. In the measurement of DPPH radical scavenging ability, $SC_{50}$ values of the cork layer and branch extract were 26.79 ${\mu}g/m{\ell}$ and 30.13 ${\mu}g/m{\ell}$. In nitric oxide (NO) scavenging ability, $SC_{50}$ values of the branch and leaf extract were 49.19 ${\mu}g/m{\ell}$ and 55.55 ${\mu}g/m{\ell}$. All extracts exhibited higher NO scavenging ability than ascorbic acid used as positive control. On the other hand, in antibacterial activity against Staphylococcus epidermidis and Staphylococcus aureus by disc diffusion assay, the pure bark extract showed the highest activity. Moreover, tyrosinase inhibitory activity of cork layer, pure bark and branch extracts showed higher activity than arbutin used as positive control. In the cytotoxicity measurement by MTT assay, leaf extract was exhibited Raw 264.7 cell viabilities of 44.68~61.83% as cytotoxic result in tested concentration. In conclusion, the branch extract of Prunus sargentii will be a functional materials without damage compared to other parts such as pure bark or cork layer in the plant.

• 한국산림과학회지
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• 제99권5호
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• pp.706-710
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• 2010

Understanding of chemical composition and energy contents in tree is important to develope strategies of renewable energy policy to cope with climate change. Residual biomass as renewable energy source was evaluated and focused on the bark-containing branches. Chemical analysis studies were conducted for different part of yellow poplar (Liriodendron tulipifera), which were partitioned to inner bark, outer bark, small branches, medium branches, big branches and trunk. The variations in hydrophobic extractives, hydrophilic extractives, lignin, carbohydrate compositions, energy contents (higher heating value) and the ash content were determined. The inner and outer bark had higher ash content, hydrophobic and hydrophilic extractives content, and higher energy content than those of tree trunk. Polysaccharides content in inner and outer bark was quite lower than those of stem or branches. Based on the energy content of residual biomass, replacement of fossil fuel and greenhouse gas emission abatement were calculated.

• 한국산림과학회지
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• 제98권5호
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• pp.584-592
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• 2009

The objective of this study was to examine the impact of pruning intensity on the vigor and cambial growth of the treated trees, and on the closure of pruning wounds for one year after pruning treatment. Two tree species, Pinus strobus and Acer palmatum, planted broadly in the urban forest of Korea were selected for the experiment. Intensity of pruning, which was estimated by proportion of removed branches, was categorized into five levels with about 10% intervals from lowest 8% up to 46%. Following parameters were examined; cambial electrical resistance (CER) and the cambial growth of trunk at 30 cm above the ground for the years before and after pruning, the cambial growth of stem at 1.5 cm above the branch bark ridge (BBR) of the pruned branch, and closure of pruning wound for one year after pruning. Tree vigor inferred from CER had a tendency to be weakened as pruning intensity increased in P. strobus, while that of A. palmatum was not affected. The trunk growth decreased significantly when the pruning intensity was higher than 30% in both species. The closure of individual pruning wound was related more to the cambial growth of stem at 1.5 cm above BBR than to the pruning intensity. Comparing the closure rate of pruning wound for one year, P. strobus with 72.1% was faster than A. palmatum with 39.3%, which corresponded with the rate of cambial growth of the two species.

• 생약학회지
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• 제39권2호
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• pp.135-136
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• 2008

Chinese crude drug 'Gye Ji(桂枝)' is listed in Shen-nung-pen-tsao-ching(神農本草經), as the remedy for dispelling pathogenic factor from the exterior of the body by diaphoresis. In Korean, herbals origin of Gye Ji is branch of Cinnamomum cassia. Considering the descriptions in many herbals(本草書), the origin of Gye Ji reported by Su-Ching(蘇敬), Han-Pao-Sheng(韓保昇) and Li -Shin-Chen(李時珍) is regarded as the bark of branch of Cinnamomum cassia.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2003년도 생물공학의 동향(XIII)
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• pp.307-312
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• 2003

헛개나무를 부위별 추출하여 total polyphenol과 flavonoid, Vitamin C equivalent antioxidant capacity를 연구한 결과 헛개나무의 수피와 열매에서 가장 많이 조사되었고 DPPH free radical scavenging activity에서도 수피와 열매에서 활성이 뛰어났다. 식물 추출물인 Polyphenol성 물질이 많이 존재 할 수록 항산화 활성은 뛰어났다.

• 생약학회지
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• 제39권1호
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• pp.50-55
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• 2008

"Ga Si O Gal Pi" is one of the Korean crude drugs used mainly to cure arthritis, acute gastritis, and beriberi. With regard to the botanical origin of "Ga Si O Gal Pi", it has been considered to be Acanthopanax species of Araliaceae, but there was no pharmacognostical confirmation on it. To clarify the botanical origin of "Ga Si O Gal Pi", the anatomical characteristics of the branch of Acanthopanax species growing wild in Korea and Japan, A. chiisanensis, A. divaricatus, A. koreanum, A. rufinerve, A. senticosus, A. seoulense, A. sessiliflorus, A. sieboldiaum were studied. As a result, it was clarified that "Ga Si O Gal Pi" was the branch and rarely the bark of branch of Acanthopanax senticosus.