• Journal of Korean Society of Forest Science
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• 제85권2호
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• pp.238-243
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• 1996

Three half-sib families of Betula platyphylla var. japonica had been introduced from Japan and tested for their growth potentiality by comparing with control trees originating from previously introduced and cultivated stands of unknown seed origin. Two of the three introduced family groups from Japan showed superior tree growth in both diameter and height to control one up to the age of four. But only one family group remained superior to the control trees at age six. It appeared from the results that Betula platyphylla var. japonica families, introduced from Japan, can be directly used for the production of planting stocks for commercial planting and/or as parental trees for the production of intra- and interspecific hybrids.

• Korean Journal of Environment and Ecology
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• 제17권3호
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• pp.224-231
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• 2003

To develope reforestation methods for environmentally sound and ecological forest management, stand structure and radial growth of the trees were investigated and compared by species and study sites. Plantation forest studied on Betula costata, Betula platyphylla var. japonica and Betula davurica, was located at Jawoon-ni Nae-myeun, Hongcheon-gun and natural forest studied on Betula costata, was located at Jangjeon-ni Jinbu-myeun, Pyeungchang-gun. In 12.3 years after planting, differences of annual diameter increment among three Betula species were significant. The highest mean annual diameter increments, 7.67mm was measured in planting Betula costata, and followed by planting Betula platyphylla var. japonica and Betula davurica, and the lowest values. 4.32mm did in natural Betula costata. If planting Genus Beula in this district. Betula costata might be the best species. From these facts, massive planting of three Betula species in this district might have much problems, but might be evaluated as proper trial.

• Korean Journal of Agricultural and Forest Meteorology
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• 제5권1호
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• pp.36-42
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• 2003

To identify the rapacity of waste leachate absorption in Populus euramericana and Betula platyphylla var, japonica, four different treatments were applied to seedlings: leachate solution (100% leachate), 50% dilution (50% leachate: 50% water, v/v) and 25% dilution, (25% leachate: 75% water, v/v) were applied to these two species. After the experiment, concentrations of heavy metals in tree parts were analyzed by an Inductively Coupled Plasma emission spectrometer (ICP). treatment with waste leachate significantly stimulated both Populus euramericana and Betula platyphylla var. japonica biomass production relative to the water control. In addition, these species showed good absorption capacity of As, Co, Hg and Ni elements. The results of this study suggested that these two species can absorb the toxic materials through their roots and transport them to stems or leaves.

• Journal of Korean Society of Forest Science
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• 제80권4호
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• pp.416-419
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• 1991

Effective micropropagation was achieved by axillary bud culture from stool shoots of 15-year-old Betula platyphylla var. japonica. Shoot development and proliferation from the explants were successful on WPM supplemented with 0.5 or 1.0mg/l BAP. All the regenerated shoots rooted when transfered to GD medium containing 0.2mg/l IBA. After transplaning to soil more than 95% of the plantlets survived and showed normal growth. The results demonstrate that masspropagation of selected mature trees is feasible using tissue culture technique.

• The Korean Journal of Mycology
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• 제38권1호
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• pp.83-84
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• 2010

We inoculated the spawn of Inonotus obliquus on living trees of Betula platyphylla var. japonica, and could get several fruiting bodies from the inoculations. The fruiting body showed almost the same feature of that collected from natural habitats in Korea, while the size was much smaller than that of natural one. The diameter of the fruiting body ranged from 1.1 cm to 4.8 cm, and the height 0.5 cm to 2.0 cm. We expect that a harvest is possible within 5 years, but need to check the growth rate of the fruiting body to decide suitable time for getting more economic value.

• Journal of Korean Society of Forest Science
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• 제84권4호
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• pp.489-494
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• 1995

Seedlings and grafts of Betula pendula and Betula platyphylla var. japonica were grown under partially controlled environments in a greenhouse and in a plastic-greenhouse installed inside a laboratory. Plant growth conditions such as photoperiod, temperature, nutrient supply were partially controlled to enhance the vegetative and reproductive growth of the birch seedlings and grafts. By the treatments twenty and seventy one percents of the seedlings, respectively, for the Betula pendula and Betula platyphylla var. japonica developed visible floral organs between 250 to 508 days after seeding. By the same treatments eighty and fifty three percents of the grafts, respectively, for Betula pendula and Betula platyphylla var. japonica developed visible male catkins between 51 to 497 days and female catkins between 365 to 396 days after grafting. Breeding cycle of birch species can be reduced to a great extent by the induction of precocious flowering at early stages of seedling and graft development.

• Journal of the Korean Society of Environmental Restoration Technology
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• 제13권6호
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• pp.87-96
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• 2010

This study was conducted to select environmentally-friendly and low-cost mulching material that could replace soil molding which can be used to restore vegetation in an abandoned coal mine area. To this end, we established 20 experimental plots (4m ${\times}$ 10m in size) on the steep, south west-facing slope of the abandoned coal mine area in Hwangji-Dong, Taebaek City, Gangwon Province in April 2006. We planted two-year-old 1,600 seedlings (at intervals of 0.6m ${\times}$ 0.8m) of drought-resistant tree species including Betula schmidtii, Betula platyphylla var. japonica, Amorpha fruticosa, and Quercus mongolica in the plots. After planting seedlings, mulching was applied by using five different kinds of material such as HWAP (Teracotem), peat moss, straw mats, wood chips, and control (no-mulching) and the effects of different mulching material on the survival rate and growth performance were compared. Three years after planting, the survival rate was the highest in wood chip mulching, followed by straw-mat, peat moss, HWAP, and control. The survival rate was the highest in Quercus mongolica, followed by Betula schmidtii, Betula platyphylla var. japonica, and Amorpha fruticosa. Meanwhile the height growth was the best in Betula platyphylla var. japonica, followed by Betula schmidtii, Quercus mongolica, and Amorpha fruticosa. The height growth of seedlings was the best in HWAP mulching, followed by peat moss, woody chips, straw mat, and control. From an economic point of view, wood chips are considered to be the best mulching material. The results showed that mulching without soil molding and/or mixing applications would be effective for restoring vegetation in an abandoned coal mine areas.

• Korean Journal of Environmental Agriculture
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• 제18권4호
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• pp.304-309
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• 1999

Biomass, tissue (foliage, stem. and root) nutrient concentration, and nutrient use efficiency (NUE) were determined for 1-year-old Pinus densiflora, Larix leptolepis and Betula platyphvlla var. japonica seedlings in a greenhouse under nitrogen (N) and phosphorus (P) fertilization treatments. There were no consistent patterns in the effect of fertilization on seedling growth, however, in most cases the addition of N and P had no stimulating effect on biomass. In general, seedling tissue N and P concentrations increased after fertilization. It appeared that fertilization induced luxury nutrient consumption because uptake was increased without altering biomass. The NUE. calculated as the ratio between total above and belowground production and nutrient content in seedlings, decreased with increasing N and P supply for P. densiflora and B. platyphylla var. japonica while that for L. leptolepisthe did not change. B. platyphylla var. japonica had the highest NUE, L. leptolepis the lowest, with P. densiflora having the intermediate NUE.

• The Korean Journal of Mycology
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• 제45권3호
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• pp.241-245
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• 2017

Chaga mushroom (Inonotus obliquus), which has invaluable medicinal uses, grows only on living trees. To date, it is still harvested from its natural habitat and is not cultivated artificially. We artificially cultivated chaga mushrooms by inoculating its sawdust spawns on Betula platyphylla var. japonica in 2007, and monitored mushroom growth on the inoculated trees for 9 years. The mushrooms grew less than 1 cm per year, with the largest mushroom growing up to 9 cm in the 9 years of study. There was no difference in the growth (diameter at breast height) of trees with viable and non-viable I. obliquus. In conclusion, artificial cultivation of chaga mushroom was successful. Our findings suggest that selection of large B. platyphylla var. japonica as host tree could lead to better I. obliquus productivity. Further improvements of the method are needed to increase the success rate of I. obliquus inoculation.

• International Journal of Oral Biology
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• 제33권4호
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• pp.137-141
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• 2008

The present study reports the protective properties of a total methanol extract of B. platyphylla var. japonica against ultraviolet (UV)-C irradiation. Pretreatment of Chinese hamster fibroblast (V79-4) cells with a total methanol extract significantly increased cell survival following $300\;J/m^2$ of UV-C irradiation. The total methanol extract was further fractionated into 5 fractions: n-hexane, dichloromethane, ethylacetate, n-butanol and water fractions. Among these fractions, B. platyphylla var. japonica ethylacetate, butanol and water fractions showed significant protective effects against the cellular damage induced by UV-C irradiation. In order to elucidate the mechanism underlying this protective effect, DPPH (Editor note: abbreviations should be spelled out at first use.) radical scavenging and lipid peroxidation inhibitory activity were measured. Significant radical scavenging and lipid peroxidation inhibitory activities were observed for the ethylacetate fraction. In summary, the present data demonstrate that an extract of B. platyphylla var. japonica has a significant protective effect against UV-C irradiation. The underlying mechanism of this protective effect may involve radical scavenging and inhibition of lipid peroxidation by the B. platyphylla var. japonica extract.