• Korean Journal of Plant Resources
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• v.34 no.2
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• pp.144-155
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• 2021

This study was conducted to analyze community structure and species composition of Abies koreana forest. Field survey was carried out from June, 2019 to 2020, September. 121 plots (20×20 m) were set up, 5 herb layer plots (3×3 m) were constructed for each plot, and there, Diameter at Breast Height(DBH), height, environmental factor were measured. It was analyzed that water stress did not have a significant effect on the factors affecting the growth of A. koreana in Mt. Halla-san, and in the case of Mt. Deokyu-san, the more forest stands located at the ridge, the higher the tree density. It was found that the factors affecting the distribution of Abies koreana were not consistent according to the environment of study site.

• Journal of the Korean Institute of Landscape Architecture
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• v.43 no.3
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• pp.52-62
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• 2015

This study conducted an experiment to clarify the effect of rubber bands used as a root connector during the process of transplanting landscape trees on the development of the root system and the rooting process. The research period was four years, from April 2007 to April 2011, and the test conducted for this study was performed at the experimental field located at 398-2 Bangdong-ri, Sacheon-myeon, Gangneung-si, Gangwon-do. Twenty 15-year-old Pinus densiflora Siebold & Zucc. with good growth conditions were harvested and transplanted from the forest in Jebi-ri, Gujeong-myeon, Gangneung-si, Gangwon-do for the field experiment. A completely randomized design was applied for plot design, with 10 pines without rubber bands and 10 pines with rubber bands. Pinus densiflora for. multicaulis Uyeki was selected as the official tree of the pot test and was planted in a transparent pot to observe the development of the root system. A completely randomized design was applied for plot design, with 3 pines without rubber bands and 3 pines with rubber bands. The results of this research on the effect of rubber bands used as a root connector on root system development and the rooting process are as follows. 1. The rate of height growth in the field test was 4.1% lower in the trees with rubber bands when compared to trees without rubber bands. Trees with rubber bands were 4.2% wider than those without rubber bands in root diameter. The chlorophyll content was 6.8% higher in trees without rubber bands, but the rate of height growth, root diameter, and chlorophyll content were not significantly correlated. 2. In the comparison of fresh root weight in the field test, trees with rubber banding had roots weighing 1,740.0kg and those without rubber bands had roots weighing 1,433.3kg. Root dry weight was 522.3g in trees with rubber bands and 450.0g in those without rubber bands, but showed no significant difference depending on whether the rubber band was attached. 3. In a comparison of root number between surfaces touching and not touching the rubber band in trees with rubber banding, the surface touching the rubber band was observed to have more roots growing, the difference of which was deemed significant. 4. The shoot growth rate in the pot test was 1.1% higher in trees without rubber bands when compared with trees with rubber bands. The chlorophyll content was 0.02 higher in trees with rubber bands but the difference was not significant. 5. In the pot test, no significance was found in comparison of root number, root length, and root dry weight in trees with and without rubber bands. These test results imply that removing rubber bands as a connector does not present any significant effects on the ground growth or root development of transplanted pine trees. As it is shown that surface touching rubber bands grow more roots in trees with rubber bands, more active related research must be undertaken.

• Journal of Korean Society of Forest Science
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• v.99 no.6
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• pp.908-913
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• 2010

This study analyzed the impact of climatic and topographic factors on tree radial growth of Pinus densiflora and Quercus spp. in central regions of Korea. To find the relationship between annual tree radial growth and climatic factors, we took the core samples from individual trees and measured the tree radial width. On the assumption that the tree radial growth is related to the tree age, we estimated the radial growth by the tree age as an independent variable. Also, we estimated the standard growth, defined as the radial growth of trees aged 30. As results, we found the spatial auto-correlation in the radial growth of the red pine. Moreover, we also found the relationships between climatic and topographic and the standard growth using the GAM (Generalized Additive Model). Increase of temperature has negative impacts on the radial growth of Pinus densiflora, while it has positive impacts on the radial growth of Quercus spp.. On the other hands, increase of precipitation has negative impacts on the radial growth of both species. Lastly, we predicted the spatial distribution changes of Pinus densiflora and Quercus spp. using the temperature increase scenario and the Geographic Information System (GIS) based forest type map. We could predict that Pinus densiflora is more vulnerable than Quercus spp. to climate change so that the habitats of Pinus densiflora will be gradually changed to the habitats of Quercus spp. in eastern coastal and southern regions of Korea after 60 years.

• Journal of agriculture & life science
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• v.46 no.2
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• pp.19-25
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• 2012

This study is an analysis of the initial growth of Adenophora triphylla var. japonica, and the growth of their above- and underground parts by means of shading treatment in order to provide a basic data that can be used in growing A. triphylla var. japonica in mountainous area. As for the rate of sprouting by shading treatment, 25% treatment and control showed the earliest sprouting. The leaf unfolding had the same order as the rate of sprouting. The analysis of the characteristics of growth of above- and underground parts showed that the growth of aboveground parts are excellent in the 25% treatment. 25% treatment were shown to be the longest in the total length of roots and root projection area. Control were discovered to be the most prominent in root surface area, root diameter, and root volume. 75% and 25% treatment in distribution by root diameter showed 72.4% and 69.5% of very fine root(>0.5mm), respectively.

• Journal of Korean Society of Forest Science
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• v.111 no.3
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• pp.374-384
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• 2022

There is an increasing demand for Tetradium daniellii seedlings due to their uses as alternative energy, for ecological restoration, and as a honey plant. This study was conducted to determine the optimum container for superior seedling production of T. daniellii. Experiments were performed using five plastic container types (500, 350, 320, 300, and 250 ml) for forestry facility cultivation. The height and root collar diameter growth of T. daniellii seedlings were significantly high in the 350-ml container. High growth appeared primarily in the container with a larger cavity volume and lower growing density. Root development was most active in full sunlight. The maximum dry matter production was observed in the 350-ml container, which was similar to the results of height and root collar diameter growth. QI, an index showing the quality of a seedling, was maximum at 0.97 in the 350-ml container. In conclusion, the 350-ml container is optimum for superior seedling production of T. daniellii.

• Journal of the Korean Institute of Landscape Architecture
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• v.40 no.5
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• pp.160-168
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• 2012

This study generated regression models to estimate the carbon storage and uptake from the urban deciduous landscape trees through a direct harvesting method, and established essential information to quantify carbon reduction from urban greenspace. Tree species for the study included Acer palmatum, Zelkova serrata, Prunus yedoensis, and Ginkgo biloba, which are usually planted as urban landscape trees. Tree individuals for each species were sampled reflecting various diameter sizes at a given interval. The study measured biomass for each part including the roots of sample trees to compute the total carbon storage per tree. Annual carbon uptake per tree was quantified by analyzing radial growth rates of stem samples at breast height. The study then derived a regression model easily applicable in estimating carbon storage and uptake per tree for the 4 species by using diameter at breast height(dbh) as an independent variable. All the regression models showed high fitness with $r^2$ values of 0.94~0.99. Carbon storage and uptake per tree and their differences between diameter classes increased as the diameter sizes got larger. The carbon storage and uptake tended to be greatest with Zelkova serrata in the same diameter sizes, followed by Prunus yedoensis and Ginkgo biloba in order. A Zelkova serrata tree with 15cm in dbh stored about 54kg of carbon and annually sequestered 7 kg, based on a regression model for the species. The study has broken new grounds to overcome limitations of the past studies which substituted, due to a difficulty in direct cutting and root digging of urban landscape trees, coefficients from the forest trees such as biomass expansion factors, ratios of below ground/above ground biomass, and diameter growth rates. Study results can be useful as a tool or skill to evaluate carbon reduction by landscape trees in urban greenspace projects of the government.

• Journal of Bio-Environment Control
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• v.12 no.4
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• pp.217-220
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• 2003

This study was carried out to investigate the growth response of Pinus densiflora seedling to relatively high day temperature during the container culture in summer season. The experiment was performed with three maximum day temperature regimes, 30~35$^{\circ}C$, 35~40$^{\circ}C$ and above 40$^{\circ}C$ in the PE house. The reduction in plant height was observed since 6 weeks after germination in the seedlings grown at relatively high day temperatures, especially the seedlings at above 40$^{\circ}C$. High temperature also reduced the root collar diameter during growth of the seedlings, therefore 17.3% of the reduction was observed in the seedlings grown at above 40$^{\circ}C$ compared with the seedlings at 30~35$^{\circ}C$. The dry weight of the seedlings grown for 16 weeks was apparently reduced by elevated dat temperature in the PE house, and the seedlings at relatively high day temperature resulted in increased T/R ratio.

• The Korean Journal of Mycology
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• v.27 no.2 s.89
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• pp.158-163
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• 1999

Powdery mildew diseases previously unrecorded in Korea were noticed on four species of ornamental trees. Field observations on each disease were described and the causal fungi were identified. Powdery mildew of Symplocos chinensis for. pilosa was found to occur mildly, especially on plants growing in shade. The causal fungus was identified as Microsphaera nomurae U. Braun. Cornus florida was found to be infected with Microsphaera pulchra Cooke & Peck and supposed to be epidemic in nursery. Powdery mildew of Malus baccata occurred on young leaves and herbaceous stems in nursery. The causal fungus was classified as Podosphaera leucotricha (Ellis & Everh.) Salmon. Powdery mildew of Ulmus macrocarpa was found to occur in autumn and severe on young shoots. Uncinula kenjiana Homma was identified as the causal fungus.

• Korean Journal of Agricultural Science
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• v.37 no.2
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• pp.217-222
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• 2010

This study was conducted to investigate the effect of fertilizer composted of dam suspended particle sawdust and sewage sludge to soil properties and seedling growth. The Betula platyphylla var japonica, Zelkova serrata and Chamaecyparis obtusa were used for this study. The soil organic matter, total nitrogen, phosphorous, exchangeable calcium, magnesium, and potassium were increased with fertilizer treatment. Heavy metal concentration in soil was increased with fertilizer treatment, but the level was very low. With fertilizer treatment, growth, photosynthetic capacity, and chlorophyll concentration of seedling were improved.

• Korean Journal of Environment and Ecology
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• v.28 no.2
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• pp.263-269
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• 2014

This study explored agroforestry strategies to achieve ecological and economic effects simultaneously for Elsentasarhai region in Mongolia under desertification, based on attitude survey with a questionnaire, field survey on planting sites, and literature review. The agrosilvopastoral approach was suggested as a type of agroforestry practices which combined tree planting for combatting desertification and wind damage to crops, agricultural crop production for income improvement, and livestock raising, a major industry in the study region. Populus sibirica and Ulmus pumila native to desert regions were selected for tree planting, and Hippophae rhamnoides, potato, and fodder appropriate for the short growing season were chosen for income crop production, reflecting residents' attitudes and growth environments. As a strategy of land allocation to satisfy multiple effects of the agrosilvopastoral approach, the alley cropping technique was recommended which arranged alternately strips of trees as windbreaks and income crops in multiple rows. The study also explored desirable planting techniques to improve conditions of income crop production and tree growth against drought and strong winds in the alley cropping. Study results will be useful as fundamental information to implement sustainable agroforestry in Mongolia and other semi-arid regions where knowledge concerned is lacking.