• Journal of Korean Society of Forest Science
• /
• v.50 no.1
• /
• pp.45-48
• /
• 1980

Multivariate analysis methods were used to examine the relationships between top and bottom growth variables of hybrid poplars after coppicing and to discriminate between clones in coppice growth potential. Strong and linear relationship was exhibited between top and bottom growth variables. Clone 5328 was different from the other clones and the best among the clones in coppice growth potential.

• Journal of Bio-Environment Control
• /
• v.18 no.3
• /
• pp.258-265
• /
• 2009

This research was conducted to compare drymatter production and yield pattern between commercial glasshouse (G) and plastic greenhouse (PG) in Korea. In both greenhouses sawing and plating of sweet pepper was 28 August and 27 September, 2007. Destructive measurement and yield of sweet pepper, cv. 'Derby', was obtained from January to May, 2008. Averaged light transmissivity over 20 times observed 65% in G and 51 % in PG. The averaged daily radiation sum of greenhouses during whole growing period was $9.03MJ/m^2/day$ for G and $7.37MJ/m^2/day$ for PG Leaf area index (LAI) in G crop was 36% higher than the crop in PG at the end of experiment (247days after planting: DAP), whereas there was no significantly difference for 212 DAP in both greenhouses. Total dry matter production was $1759.9g{\cdot}m^{-2}$ for G and $1308.5g{\cdot}m^{-2}$ for PG Fruit production observed $14.1kg{\cdot}m^{-2}$ in G and $7.8kg{\cdot}m^{-2}$ in PG. There was slightly difference measurement of dry matter distribution of generative or vegetative parts to total dry matter between G and PG.

• Journal of the Korean Society of Environmental Restoration Technology
• /
• v.21 no.3
• /
• pp.1-12
• /
• 2018

This study was conducted to obtain a reliable result assessing proper amount of solid swine manure for the growth of Deutzia crenata seedlings. Seedling growth dry weight, chlorophyll content inorganic nutrients and soil chemical properties were investigated. 1. When treated with solid swine manure, seed germination rate was highest on the control. However, germination rates tended to decrease when treated with swine manure at high concentrations. 2. The growth of seedlings treated with swine manure was always higher than that of in control. At the 1.0% of swine manure treatment, the growth rate of the seedlings was highest. 3. Seedling dry weight was highest at the 1.0% swine manure treatment. The amount of inorganic nutrients absorbed by the seedling was generally high with the 1.0% treatment, declined sharply with the 2.0% treatment. 4. For the planting soil of Deutzia crenata, the higher the concentration of swine manure, the lower the soil pH. However, nitrogen, available P, K, Na, Mg and Ca contents in the soil have increased with higher concentrations.

• The Korean Journal of Ecology
• /
• v.28 no.6
• /
• pp.389-393
• /
• 2005

This study was carried out to investigate the effects of soil acidification on the growth of 3-year-old Pinus densiflora seedlings grown for 21 weeks in brown forest soils acidified with $H_2SO_4$ solution. The concentrations of Al in the acidified soils were increased with increasing amount of $H^+$ added to the soil. The total dry weight of the seedlings was reduced by the addition of the $H_2SO_4$ solution. In addition, there was a strong positive correlation (r=0.97, p<0.01) between the dry weight of the seedlings and the molar (Ca+Mg+K)/Al ratio of the soil. The seedlings with the molar (Ca+Mg+K)/Al ratio of 1.0 resulted from approximately 50% growth reduction compared with the control value. The results suggest that the molar (Ca+Mg+K)/Al ratio of the soil may be a useful indicator for assessing the critical load of acid deposition.

• Journal of agriculture & life science
• /
• v.43 no.6
• /
• pp.1-6
• /
• 2009

The purpose of this study was to analyze annual tree ring growth characteristics for major tree species distributed in Chungbuk province. A total of 800 sample trees from 56 permanent sampling plots measured by the 5th Korean National Forest Inventory Program in 2007 was used for the calculation of annual growth rates. According to the results of this study, the species of Robinia pseudoacacia(2.30mm/yr) showed the best annual tree ring growth rates and the others are Quercus serrata(2.27mm/yr)>Prunus sargentii(1.98mm/yr)> and Larix leptolepis(1.98mm/yr) in order. Most of the major tree species in Chungbuk province, as tree age and stand density increased, annual tree ring growth rates tended to decreased. This information could be very useful for forest managers to understand annual tree ring growth characteristics in Chungbuk province.

• Journal of the Korean Society of Environmental Restoration Technology
• /
• v.21 no.6
• /
• pp.15-25
• /
• 2018

This study was conducted to obtain proper amount of solid poultry manure in the beginning phase of Deutzia crenata growth. Seedling growth increment, dry weight, inorganic matter uptake and chemical changes of soil according to the concentration of solid poultry manure fertilization. 1. When treated with solid poultry manure, seed germination rate was highest on the control. However, germination rates tended to decrease when treated with at high concentrations. 2. The growth of seedlings treated with poultry manure was always higher than that in control. At the 1.0% of poultry manure treatment, the growth rate and dry weight of the seedlings was highest. 3. The amount of inorganic nutrients absorbed by the seedling was generally high with the 1.0% treatment, declined sharply with the 2.0% treatment. 4. For the planting soil of Deutzia crenata, the higher the concentration of poultry manure, the lower the soil pH. However, nitrogen, available P, K, Na and Mg contents in the soil have increased with higher concentrations.

• Asian Journal of Turfgrass Science
• /
• v.2 no.1
• /
• pp.31-40
• /
• 1988

4가지 관수 처리 회수가 한국 잔디와 Zoysia-82에 미치는 영향을 조사한 결과는 다음과 같다. 1. 한국 잔디가 각 관수처리마다 Zoysia-82보다 엽장은 길고 엽복은 넓은 편이었다. 2. Runner의 생장은 Zoysia-82가 왕성했으며, 두 품종 공히 매일 1회 관수, 대비구(자연상태), 5일, 10일마다 1회 관수구순으로 runner의 길이가 길고 1일 생장량도 많았다. 3. 이식시 단위 spring당 각 부위별 건물량은 한국잔디가 더 무거웠으나 생육을 거듭할수록 Zoysia-82가 더 무거웠고, 1일 건물량 증가량도 Zoysia-82가 더 많았다. 4.지표면 피복율은 각 관수처리별 Zoysia-82가 한국 잔디보다 빨랐다. 두 품종 공히 매일 관수구 가장 빨랐고, 대비구, 5일, 10일마다 1회 관수구 순으로 빨랐다.

• Korean Journal of Environment and Ecology
• /
• v.29 no.5
• /
• pp.777-784
• /
• 2015

This study verified the correlations between vegetation factors, such as the number of individual species and species diversity, and soil factors in Chamaecyparis obtusa (CO) stands in Jeollanam-do. Also, the site environmental factors that affect the annual growth of CO ring width were analyzed. Positive correlations were found between the species diversity index and Cation Exchange Capacity (CEC), available phosphate, and exchangeable $K^+$ (P<0.01). In addition, strong positive correlations were also found between the number of species that appeared in the study site and CEC, available phosphorus, exchangeable $K^+$ and exchangeable $Mg^{2+}$ (P<0.01). Tree ring growth showed strong correlations with the nutrient holding capacity and fertility of soil, including available phosphate, exchangeable $K^+$, CEC, and electrical conductivity (P<0.01). The explanatory variables of tree ring growth in CO were composed of exchangeable $K^+$, organic matter content, and soil pH. The regression model had a high level of explanatory power, 74.4%. In this model, the annual growth of CO ring width increased when exchangeable $K^+$ and organic matter content were higher but decreased when soil pH was lower. According to the analysis, it is found that the annual growth of CO ring width was significantly affected by soil fertility, including available phosphate, exchangeable $K^+$, CEC, and electrical conductivity. In addition, the soil fertility of CO stands seems to be significantly affected by the supply of fallen leaves from the understory vegetation of CO.

• Proceedings of the Korean Society for Bio-Environment Control Conference
• /
• 1995.04a
• /
• pp.55-56
• /
• 1995

작물의 생육환경을 계측하기 위한 환경 센서는 공업용으로 이용되는 센서들과는 달리 작물의 적정 생장환경 범위 내에서의 정확도와 안정성이 중요하고, 온실 환경에 대한 내구성 및 신뢰성이 요구되며, 가격이 저렴하고, 소형ㆍ경량화가 이루어져야 한다. 또한, 생장환경 변화로써 작물의 생장량을 증대시킬 수 있도록 하기 위해 생장환경 자료를 수집ㆍ분석할 수 있는 시스템도 필요하다. (중략)

• Journal of Korean Society of Forest Science
• /
• v.103 no.3
• /
• pp.422-430
• /
• 2014

This study was conducted to investigate growth changes of DBH, height, crown width, volume, stem biomass, and dead trees after thinning treatments with different thinning intensity for Korean white pine (Pinus koraiensis) plantation. First thinning was applied with 29~69% intensity based on number of trees in 19-yearold plantation, and trees were measured three times: right after thinning (19-year-old), 5 years later (24-yearold), 12 years later (29-year-old). In the case of DBH growth, average DBH growth of heavily thinned plots was 19.6~19.9% higher 5 years later, and 13.3~24.7% higher 12 years later, compared to that of unthinned plots. Initial diameter growth rate was higher than late growth rate. The proportion of large pole candidates ($DBH{\geq}25cm$) was 31% in heavily thinned plot while only 2% was shown in unthinned plot. No difference was shown in height growth depending on plots, and average crown width growth in heavily thinned plots was 30.6~33.3% higher, 5 years later, and 35.0~40.0% higher, 12 years later, compared to that of unthinned plots. Average volume growth of individual trees in heavily thinned plots was 39.8~46.8% higher, 5 years later, and 23.0~52.0% higher, 12 years later, compared to unthinned plots. The maximum volume and biomass per unit area were shown in unthinned plot; the volume and biomass 5 and 12 years later after thinning were $133m^3/ha$ (51 kg/ha) and $344m^3/ha$ (132 kg/ha), respectivily. The significant difference appeared in crown width, volume, and biomass depending on thinning intensity. No dead trees occurred in heavily thinned plots for 12 years after thinning, while mortality rate in unthinned plots was 27.9~37.8%. As a result of analyzing annual increment using cores to determine the timing of second thinning, it suggested that second thinning be suitable around 10 years after first thinning.