• Title/Summary/Keyword: fire-killed tree

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Variation of Material Properties of Fire-killed Timber (I) - Mechanical Properties of Fire-killed Korean Red Pine in the East Coast Area - (산불 피해목의 재질 변화에 관한 연구(I) - 동해안 산불 피해 소나무의 재질 특성 -)

  • Park, Jung-Hwan;Park, Byung-Soo;Shim, Kug-Bo;Jo, Tae-Su
    • Journal of the Korean Wood Science and Technology
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    • v.33 no.6 s.134
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    • pp.8-16
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    • 2005
  • Fire-killed trees of Korean red pine are valuable resources for industrial uses. It is common only believed that fire-killed trees are too weak and brittle to use in construction purposes. The misunderstandings of fire-killed trees lead these valuable resources abandonment. The purposes of this research are focused on scrutinization of material properties of fire-killed trees to facilitate industrial uses of these resources. The sample logs were collected from the forest fire site of the eastern coast area in which the most catastrophic wild fire had taken place in 2000. Fire-killed Korean red pines were classified into 3 levels by the degree of fire damage so called light, medium and heavy, then their physical, mechanical and chemical properties were compared with sound trees. No significant difference in physical appearances were found in the cross sections by degree of damage compared to sound tree but bark char. Investigation on mechanical and chemical properties indicates that forest fire did not impact significantly in lowering the strength of damaged trees. It was concluded that there was any limitation of forest fire-killed trees of Korean red pine in industrial utilization.

Variation of Material Properties of Fire-killed Timber - Impact of Time on Degradation of Mechanical Properties - (산불 피해목의 재질변화에 관한 연구(II) - 산불 피해 소나무의 경시적 재질변화 -)

  • Park, Jung-Hwan;Park, Byung-Soo;Kim, Kwang-Mo;Lee, Do-Sik
    • Journal of the Korean Wood Science and Technology
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    • v.36 no.1
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    • pp.30-35
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    • 2008
  • Degradation of mechanical properties of fire-killed Korean red pine has been investigated after death in 5 years period. Impact bending absorbed energy was the most sensitive property by elapsed time after forest fire. It is an indication of incipient decay of the wood and can be useful indicator to monitor any change of mechanical property of fire-killed tree after death. Degradation of mechanical properties was more pronounced in sapwood than heartwood. Impact bending absorbed energy was more reduced than any other properties in both sapwood and heartwood, while compressive strength was least impacted by elapsed time after forest fire. It is recommended that the fire-killed Korean red pine can be harvested in one year after the fire for industrial uses by considering decay and consequent changes of mechanical properties.

A Study on Properties of Hardboard from Japanese Larch Killed by Fire (일본잎갈나무 산화(山火) 고사목(枯死木)을 원료(原料)로 한 하드보드 재질연구(材質硏究))

  • Jun, Yang
    • Journal of the Korean Wood Science and Technology
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    • v.9 no.2
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    • pp.31-35
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    • 1981
  • This study was carried out to investigate the properties of hardboard made from fire killed larch tree and also effects of standing period after killed by fire. The results are as follows; 1. There were no effects on hardboard properties among the standing period differences after killed by fire within about 2 years. 2. Specific gravities, moisture contents, water absorptions of the boards from dead trees have no differences compared with those of sound wood. 3. Bending strengths of the boards from dead trees we re decreased in the range of 24-28% of the boards from sound wood.

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Bacterial Shoot Blight of Apple Caused by Pseudomonas syringae (Pseudomonas syringae에 의한 사과나무 가지마름병의 발생)

  • 서상태;원선영;박덕환;김영숙;허장현;임춘근
    • Plant Disease and Agriculture
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    • v.5 no.1
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    • pp.46-49
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    • 1999
  • Bacterial blight occurred on the flowers, leaves, twigs and branches of apple trees (Malus domestica Borkh) in Chunchon, Kangwon-Do. Infected flowers and leaves turned brownish black, and they were fallen down or remained hanging in the trees. Under humid conditions during postblossom period, the casual bacterium spreaded along twigs and killed them. However, killing of branches was very rare. The symptoms on apple trees were very similar to symptoms of fire blight. But the causal organism isolated from the lesions was identified as Pseudomonas syringae based on physiological and chemical characteristics. This is the first described bacterium that causes apple shoot blight in Korea.

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