• The Korean Journal of Ecology
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• v.18 no.1
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• pp.89-97
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• 1995

In order to study the successional trend and the heterogeneity of forest community, we investigated DBH frequency distribution of dominant tree species and the changes of several community indicies including ${\beta}-diversity\;({\beta}_t)$ along a belt transect in Mt. Yongam, Kwangnung Experimental Forest, which has been preserved for about 530 years. Quercus serrata, Carpinus laxiflora, and C. cordata were the three dominant species and their DBH frequency distribution showed a reverse J-shaped form, so these species seem to maintain by themselves. Dominancediversity curve had a lognormal distribution. d and H'for pooled quadrats were 0.13 and 1.09, respectively, but these indices within each quadiat varied with the range of 0.13 to 0.57 and 0.5 to 1.09, respectively. The value of ${\beta}_t$ along the belt transect ranged from 0.14 to 0.42. These results suggest that this forest community is in the stable climax stage but the components experience a heterogeneous microsuccession.

• Economic and Environmental Geology
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• v.21 no.3
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• pp.277-285
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• 1988

The ELF-MT survey has been conducted at 9 points along the national road between the Sindangri and Dojonri area to study on the boundary between the Okchon and Choson systems, and subsurface geological structure of these two systems. Natural electromagnetic fields of 7.8, 14, and 20 Hz in the Schumann resonant frequency band were used for ELF-MT measurement. Apparent resistivity values were calculated from the measured magnetic and electric fields at each frequency, and resistivity sections were obtained by means of a trial and error method for one-dimensional analysis and finite element method for two-dimensioal analysis. The results of this study show that the resistivities of the Okchon and Choson systems are 700-3500 ohm-m and 40-5000 ohm-m, respectively. The boundary between these two systems is a fault with the width of 1 km fault zone and resistivity value of 200 ohm-m, and is located around Koburangjae. Another fault is appeared in Sindangri, and its resistivity value is 130 ohm-m. Intrusion of biotite granite is distributed in Jungchijae, and its resistivity value is 750 ohm-m. The area between Susanri and Koburangjae shows the highest resistivity value of 3500 ohm-m because metabasite and amphibolite are distributed in that area. Extremely low resistivity value of 40 ohm-m around Yongamsan is due to the Yongam formation, which is composed of graphitic black slate and overlying Choson Great Limestone group.

• The Korean Journal of Ecology
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• v.8 no.1
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• pp.31-37
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• 1985

The decomposition rate of litter and the number of soil microorganisms were measured on various slope directions in deciduous oak forest in Mt. Yongam. And the chemical constitutents of litter and soil were analyzed. The decomposition rate by slope directions followed the order east facing slope>south-east facing slope>north-west facing slope>north-east facing slope>north facing slope>south facing slope>south-west facing slope>west facing slope. Of the chemical constituents analyzed, original concentrations of Ca and carbohydrate were closely correlated with the decomposition rate. There was a close relation between the number of fungi and decomposition rate by slope directions. However, a little relationship existed between the number of bacteria and decomposition rate by slope directions. The number of fungi and concentrations of Ca and carbohydrate correlated to each other. And the number of bacteria is related to concentrations of phosphorus.