• Korean Journal of Environment and Ecology
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• v.23 no.2
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• pp.220-232
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• 2009

The objective of this study was to understand the relationships between forest vegetation characteristics and the damage of Oak wilt disease. Field surveys were carried out for two groups. One group(Group A) consists of Oak wilt infected 18 sites from 7 provinces, and the other group(Group B) consists of 5 permanent sites where data on the relative density of entrance holes drilled by Platypus koryoensis., the vector of Oak wilt disease, were available. Survey results showed that 17 of 18 sites were dominated by Quercus spp.(Group A) and also showed a significant positive relationship($R^2=0.89$, P<0.05) between the relative density of entrance holes and the relative density of Quercus spp.(Group B) implying that the susceptibility to Oak wilt disease is related with the high dominance of Quecus spp. in a forest stand.

• Korean Journal of Plant Taxonomy
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• v.38 no.4
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• pp.405-431
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• 2008

Cuticle micromorphology of 22 species of Quercus and outgroup were examined by the SEM. Twenty-two species selected each two or three species in all section of the genus Quercus. The genus Trigonobalanus and Alnus are selected as outgroups. Ten characters of the inner surface and eight characters of the outer surface of the cuticle have been described. Some characters, such as the present of papillae, arrangement of subsidiary cell, shape of anticlinal cell wall are considered important character for infrageneric classification. A parsimony analysis of 18 characters resulted in 72 most parsimonious trees with its lengths of 66 steps. The topology obtained from the analysis showed two major lineages. Subgenus Cyclobalanopsis formed one clade by 75% and subgenus Quercus formed another clade by 57% bootstrap value. Based on the cuticle morphology, the two subgenus delimitation of Camus was supported. However, sect. Erythrobalanus and sect. Cerris formed one group, and sect. Lepidobalanus formed polytomy.

• Journal of Korea Foresty Energy
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• v.21 no.2
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• pp.43-50
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• 2002

This paper describes experimental results on the utilization of some Korean oak woods for whisky aging barrel. Some anatomical characteristics as vessel diameter, ray spacing, ray height, existence of tyloses, water absorption and color change of alcohol during immersing of wood samples were examined. The oak woods used in this study were ring-porous. The type of ray was a compound ray consisted of uniseriate ray and broad ray. The ray parenchyma cells were almost procumbent, tyloses were presented in white oak(Quercus aliena, Quercus variabilis, Quercus dentata, Quercus mongolica), but absented in red oak(Quercus rubura). Density of wood samples decreased during immersing in alcohol. Alcohol color in Quercus dentata and Quercus aliena presented more darker than other samples. Water absorption of sapwoods was higher than that of heartwoods. Especially, red oak showed more higher water absorption than white oak. Consequently, Korean white oak woods can be used as the whisky aging barrel.

• The Korean Journal of Ecology
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• v.17 no.3
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• pp.241-249
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• 1994

Leaf diffusive resistance (LDR), stomatal density, length of guard cell and hair density of leaves of 6 oak species were determined under withdrawal of water, and their strategies of drought stress were analyzed by principal component analysis. LDR of Quercus acutissima, Q. aliena and Q. serrata increased earlier than those of the other species at high leaf water potential $({\Psi}_{leaf})$ or low water saturation deficit (WSD), which was an avoidance mechanism reducing damage by water stress. Q. variabilis with low stomatal density, small stomatal size and high hair density had avoidance mechanisms increasing LDR at high $({\Psi}_{leaf})$ However, Q. mongolica and Q. dentata increased LDR at low $({\Psi}_{leaf})$ as xeric species do. Results from principal component analysis on the 15 variables related to strategies of drought stress indicated that the 6 oak species were divided into 2 groups: (1) Q. acutissima, Q. aliena and Q. serrata as mesic habitat species and (2) Q. variabilis, Q. mongolica and Q. dentata as xeric habitat species. Among three xeric species Q. acutissima differed from the other two species in the drought strategies such as high hair density, low stornatal density, high leaf area ratio, stomatal closing at low $({\Psi}_{leaf})$ and small cell wall elasticity. The results could reasonably explain their drought strategies in natural habitat.

• Korean Journal of Agricultural and Forest Meteorology
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• v.10 no.2
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• pp.47-57
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• 2008

Physiological and biochemical changes of five species of genus Quercus exposed to ozone fumigation were investigated to assess their tolerance against ozone toxicity. At the end of 150 ppb ozone fumigation, chlorophyll contents, photosynthetic characteristics, malondialdehyde(MDA) and antioxidative enzyme activities were measured in the leaves of five Quercus species(Quercus acutissima, Q. aliena, Q. palustris, Q. serrata, and Q. variabilis). Chlorophyll and carotenoid contents, net photosynthesis and carboxylation efficiency decreased after ozone treatment, indicating that $O_3$-exposed plants underwent physiological inhibition. The reduction rate of total chlorophyll contents and carboxylation efficiency were respectively 15% and 34% for Q. aliena and 38% and 62% for Q. variabilis. The amount of MDA increased with the highest increase rate of 140% in Q. acutissima which also showed the highest increase rate(60%) of superoxide dismutase(SOD). Ascorbate peroxidase(APX) activity increased in Q. variabilis, Q. serrata and Q. acutissima by ozone treatment. Based on our results, ozone tolerance of the five Quercus species was ranked as Q. aliena>Q. palustris>Q. serrata>Q. variabilis>Q. acutissima. We concluded that chlorophyll contents, photosynthesis, MDA content and antioxidative enzymes were the important physiological markers for tolerance against ozone stress, which were closely related with one another.

• Proceedings of the Zoological Society Korea Conference
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• 2003.08a
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• pp.120.1-120
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• 2003

• Journal of the Korean Wood Science and Technology
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• v.10 no.3
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• pp.52-67
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• 1982

We have relatively heavy stocks of hardwood which consist of inferior and nonproductive natural hardwood species in Korea. As conception above to develope these forest resources, the study was carried out to obtain the basical data for the reasonable and efficient utilization of hardwoods. The sample trees were selected 11 natural hardwood species grown in Kangwon-do region and Kwangnoong Experimental Forest. We have investigated anatomical, physical and mechanical properties of them. Especially, Quercus species which is a major species in the forests was investigated on qualities of trees, logs and lumbers, recevery of bucking and lumber yield, etc.

• Conservation Science in Museum
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• v.10
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• pp.29-42
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• 2009

This paper explores the types (species of trees) of 25 pieces of waterlogged wood excavated from the area between Gwangju and Jangseong during road expansion by the Gwangju National Museum. These 25 pieces of wood include nine pieces of Quercus (Lepidobalanus Cerris)sp., six pieces of Quercus (Lepidobalanus Prinus)sp., three pieces of Castanea sp., two pieces of Salix sp., one piece of Alnus sp., one piece of Prunus sp., one piece of Morus sp., one piece of Chionanthus sp., and one piece of Acanthopanax sp.

• Proceedings of the Zoological Society Korea Conference
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• 1994.10a
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• pp.227.1-227
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• 1994

• Proceedings of the Zoological Society Korea Conference
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• 1995.10b
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• pp.154.2-154
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• 1995