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무기적 환경요인이 잣나무 유묘의 (幼苗) 생육에 미치는 영향에 관한 연구 (Ⅲ) 중량생장과 (重量生長) T / R 율에 대한 피음처리 (被陰處理) 및 단근의 (斷根) 영향
김영채 ( Young Chai Kim ) 한국산림과학회 1987 한국산림과학회지 Vol.76 No.3
This study was carried out to investigate all the parts` weight growth under the different light intensity and root-cutting. As results : ·Fresh and dry weight of leaf, shoot, root and seedling treated under 63% R.L.I showed the largest growth. ·The largest growth in fresh and dry weight of shoot arid seedling appeared at 1/4 root cutting plot. The value of T/R ratio was increased in low light intensity and high root-cutting. ·The simple nonlinear relationship between light intensity, root-cutting and T/R ratio was recognzed, respectively.
무기적 환경요인이 잣나무 유묘의 (幼苗) 생육에 미치는 영향에 관한 연구 (Ⅷ) - 이식상에서의 (移植床) 엽 중량생장 -
김영채 ( Young Chai Kim ) 한국산림과학회 1988 한국산림과학회지 Vol.77 No.2
This study was carried out to investigate the influence of shading pretreatment and planting density on the periodic needle leaves growth in fresh and dry weight. 1. The fresh and dry weight growth of needle leaves per seedlings increased with light intensity and decreased with increase of density. The best growth of needle leaves in fresh weight and dry weight appeared during the period from May to June. 2. The contribution rates to the growth of fresh and dry weight of needle leaves were 1.9% and 5.1% in light intensity, 3.6% and 3.2% in density and 83.7% and 75.6% in growth period, respectively. 3. For the three factors, shading, density and growth period, all the interactions between any two factors, and among the three factors in the fresh and dry weight growth of leaves per plant were significant.
무기적 환경요인이 잣나무 유묘의 (幼苗) 생육에 미치는 영향에 관한 연구 (Ⅶ - 이식상에서의 (移植床) 중량생장에 대한 피음처리 (被陰處理) 영향 -
김영채 ( Young Chai Kim ) 한국산림과학회 1988 한국산림과학회지 Vol.77 No.1
This research was performed to estimate the influence of relative light intensity, planting density, growth period on the growth of fresh and dry weight of the stem and branches, and root in the pretreatment transplanting bed. 1. The growth of fresh and dry weight of the stem and branches per seedling varied in the order of 63%$gt;100%$gt;37%$gt;19% in relative light intensity, and increased with decrease of planting density, and grew highly during the period from May to June. The contribution rates to the growth of fresh and dry weight of the stem and branches were 49.4% and 39.6% in shading treatment, and 4.3% and 6.4% in planting density, and 34.2% in growth period respectively. Of the three factors, that is, shading, density and period, all of the interactions between two factors, and among the three factors in the growth of fresh and dry weight of stem and branches were significant. The growth of fresh and dry weight of root per seedling increased with light intensity and decreased with increase of density. The best growth of root, showed during the period from May to June in fresh weight, but during the period from July and August in dry weight of root. For the three factors, that is, shading, density and growth period, all the interactions between any two factors, and among the three factors in the growth of fresh and dry weight of root were significant.
무기적 환경요인이 잣나무 유묘의 (幼苗) 생육에 미치는 영향에 관한 연구 (Ⅰ) - 파종상에 (播種床) 있어서의 피음처리 (被陰處理) 영향 -
김영채 ( Young Chai Kim ) 한국산림과학회 1986 한국산림과학회지 Vol.73 No.1
This study was carried out to investigate the influence of light intensity on the growth of Korean white pine (Pinus koraiensis) seedlings. The seedlings were grown under four different relative light intensities: 100%, 63%, 37%, and 19% of full sunlight by covering with saran screen on seed bed. The results obtained were summarized as follows; 1. The highest shoot elongation was found at 37% in relative light intensity (RLI) plot, and the best growth in root, seedling length and diameter increment appeared at 100% on RLI plot. Contribution rates of shading to growth in shoot elongation, root growth, seedling length, and diameter increment were 9.3%, 26.2%, 21.0%, and 48.7%, respectively. 2. The greatest number of one-year-old needle fascicle was found at 100% in RLI plot, whereas that of two-year-old needle fascicle appeared at 37% in RLI plot. The contribution rate of the light intensity to number of needle fascicle was 3.9% and factor of leaf age contributed to number of needle fascicle in 27.8%. The length of needles grown under different light intensities varied with needle ages. The longest length of new needles appeared at 37% in RLI plot, but old needles were not clear in influence of light intensity. The contribution rate to needle length by the light intensity was 2.5%. 3. The heaviest value of the fresh and dry weight of seedlings appeared at 100% of RLI plot then decreased with light intensity. The contribution rates to fresh ,and dry weight by the shading were 38% and 7.6% respectively. 4. The largest value of the dry weight of needles appeared at 100% of RLI plot and then decreased with light intensity. The contribution rates to dry weight of needles by the light intensity was 13.18%. 5. The values of T/R ratio increased with decreased light intensity and the contribution rate was 7.0%. 6. Positive correlation and linear regressions were recognized between dry weight of leaf and other factors (dry weight of shoot, root, seedling and diameter increment).
무기적 환경요인 잣나무 유묘의 (幼苗) 생육에 미치는 영향에 관한 연구 (Ⅸ) - 이식상에서의 (移植床) 묘중 생장 및 T / R 률 -
김영채 ( Young Chai Kim ) 한국산림과학회 1988 한국산림과학회지 Vol.77 No.4
This research was performed to estimate the degree of influence of relative light intensity and planting density on the weight growth in the trans-planting bed. The Piuns koraionsis seedlings treated for different degrees of shading on seed bed were planted in transplanting bed. 1. The seedling weight growth under 100% relative light intensity and 6×6 plot(36 individual) density showed the largest growth and the best growth was found during 26th of May 25 of June. 2. As the relative light intensity decrease and with planting density increased, the weighJt growth decreased. And the weight growth had a tendency to decrease after 26th of May-25th of June. 3. T/R ratio showed the highest value under 63% relative light intensity and 12×12 plot (224 individual) of planting density. The highest T/R ratio was found during 26th of July-25th August.
김영채 ( Young Chai Kim ),정동준 ( Dong Jun Chung ),김홍률 ( Hong Ryul Kim ) 한국농림기상학회 2002 한국농림기상학회지 Vol.4 No.4
Air pollution by acid pollutants is problematic in the whole world. Water acidification has already been deteriorating the forest ecosystem. This study was conducted to analyze the acidity and chemical composition of the open precipitation and throughfall at forests with various geographic locations in Korea. The results of this study are as follows; The open precipitation pH was lowest in Seochun. The throughfall pH showed some buffering capacity in only Quercus mongolica stands. In Pinus rigida(Shingal and Seochun) stands, there was little difference from the open precipitation. Chemical composition of the open precipitation for each sampling site showed that Ca^2+, NH^+_4 and SO^2-_4 concentrations had higher value than other ions, and except these ions, the small quantity of ions showed different properties to each site. Changes of ion concentrations in the throughfall showed a tendency to increase. Ion concentrations of the throughfall increased with washout and nutrient leaching from the trees. In conclusion, the influence was extended to the pure zone, and the frequency of acid rain is increasing. But, if the deposition of pollutants exceeds the capacity of purification, it would damage forest ecosystem. Further investigations are necessary to identify tolerant tree species to acid pollutants.
김영채(Young Chai Kim),손미정(Mee Jung Sohn),이옥재(Ok Jae Lee) 대한소화기학회 1995 대한소화기학회지 Vol.27 No.6
N/A Backgrounds/Aims: Although surgical procedures remain the principal method of treating pancreatic pseudocysts, it has recently been challenged. The objective of this study is to evaluate the outcomes of surgical and nonsurgical treatment, in order to recognize the necessity for changing guideline to treatment option of pancreatic pseudocysts. Methods: We analysed retrospectively clinical characteristics, classification, treatment modalities and its success, complication rate and mortality rate of 48 patients with pancreatic pseudocysts from January 1988 to Febrary 1994. Results: Acute pseudocysts were 34, chronic pseudocysts 14cases. According to D'Egidio and Schein, type I, II, or III pseudocysts were 30, 17 and ] cases, respectively. Percutaneous catheter drainage, surgical treatment and conservative treatment were applied in 45.8%, 25.0% and 29.2%, respectively and the success rates were 81.8%, 91.7% and 50.0%, respectively. The complication rate of percutaneous catheter drainage and surgical treatment were 36.9% and 33.0%, respectively, but the mortality rate was 0%. Conclusion: Percutaneous catheter drainage as well as surgical treatment were effective and safe in the treatment of pancreatic pseudocyst. Thus we recognized the necessity for considerating nonsurgical treatment based on classification of pseudocyst and changing guideline to treatment of pseudocyst. (Korean J Gastroenterol 1995;27:719 - 727)