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상수리나무에 대(對)한 모래밭버섯균(菌)과 알버섯균(菌)의 접종효과(接種效果)
이천용,이원규,Lee, Chun-Yong,Lee, Won-Kyu 한국토양비료학회 1987 한국토양비료학회지 Vol.20 No.1
상수리나무에 대한 모래밭버섯균(Pt)와 알버섯균(Rr)의 접종효과(接種效果) 및 적정(適正) Pt 접종량(接種量)을 구명(究明)코저 토양소독(土壤消毒)을 실시(實施)하고 균근균(菌根菌)을 접종(接種)한 결과(結果)는 다음과 같다. 1. 균근형성율(菌根形成率)은 생장(生長) 2년차(年次)에 Pt가 최고(最高) 42%, Rr이 36%로 비교적 낮았으나 1년차(年次)에는 높았을 것으로 생각된다. 2. 상수리나무묘목(苗木)의 생장(生長)은 토양소독구(土壤消毒區)에서 우세하였으며 특히 Pt 배량접종구(倍量接種區)가 가장 좋았다. 3. Rr 접종구(接種區)는 Pt 접종구(接種區)와 비슷한 생장(生長)을 하여 Rr 균(菌)의 접종효과(接種效果)가 나타났다. 4. 토양소독후(土壤消毒後) 균접종(菌接種)으로 지하부(地下部) 중량(重量)이 크게 증가(增加)하였으며 따라서 조림후(造林後) 활착율증대(活着率增大)가 기대된다. 그러나 토양무소독구(土壤無消毒區)에서는 균접종효과(菌接種效果)가 뚜렷하지 않았음. 5. 엽내양분함량(葉內養分含量)은 N과 $P_2O_5$에서 처리간(處理間)의 차(差)없이 상당히 높았고 $K_2O$와 CaO는 토양소독접종구(土壤消毒接種區)가 높아 균접종(菌接種)에 의한 양분흡수(養分吸收) 효과(效果)가 인정(認定)되었다. Quercus acutissima seedlings were grown for two years in fumigated or non-fumigated in nursery soil in a medium with and without vegetative inoculum of the ectomycorrhizal fungi, Pisolitlius tinctorius (Pt) and Rhizopogon rubescens (Rr). Mycorrhizal formation were 42% in fumigated Pt inoculation and 36% in fumigated Rr inoculation. $2.16{\ell}\;per\;m^2$ of Pt vegetative inoculum in fumigated soil stimulated the seedling height (98%), root collar diameter (132%) and weight (420%). And Rr inoculation in fumigated soil increased the seedling height (44%), root collar diameter (23%) and weight (157%) compared with non-treated plot. There was no effect of Pt and Rr inoculation on the growth in non-fumigated soil. Nitrogen and $P_2O_5$ contents in foliage were not different by the treatment but $K_2O$ and Ca in fumigated soil were higher than non-fumigated soil.
이천용,이원규,박승걸,김갑성,오민영 ( Chun Yong Lee,Won Kyu Lee,Seung Kul Park,Kap Sung Kim,Min Young Oh ) 한국산림과학회 1987 한국산림과학회지 Vol.76 No.3
This study was carried out to examine the proper site fur Pinus rigida × P. taeda. The 91 sample plots (20×10m) were selected from the plantations located in middle part of Korea. Soil, environmental and climatic factors were investigated and regressed on the growth of Pinus rigida × taeda. ① The factory which influenced strongly on tire growth were temperature, elevation, soil moisture, physiographic position, slope, soil depth, wind protection, soil compactness and soil organic matter contents in order. ② The most effective factors among them mere temperature, elevation, soil moisture and physiographic position. ③General conditions of proper site for planting the hybrid pine were above-8℃ in mean minimum temperature in January, below 200m in elevation, moderate soil moisture, and valley or flat area in physiogtaphic position.
이천용,박봉우 ( Chun Yong Lee,Bong Woo Park ) 한국산림과학회 1988 한국산림과학회지 Vol.77 No.1
Decrease of the planting area reduced fertilized area of forest. To accomplish the aims of natural regeneration, mini-rotation plantation, diminishing the rotation length, maintaining healthy forest and production of good quality timber, forest fertilization should be continued. In order to improve the deteriorate situation, slow-release fertilizer applied on top soil needs to be developed and aerial application will give diminished cost. Fertilization with tending before tree felling in forest will increase the effect of fertilizer more, Proper quantity of fertilizer by tree species and soil fertility should be found out in the future, Street trees, environmental forest near city and ornamental trees in the residential areas could be also included in this field.
이천용 ( Chun Yong Lee ) 한국산림과학회 1983 한국산림과학회지 Vol.60 No.1
This survey was carried out in Schneegattern Forest District which is located 40 ㎞ northeast of Salzburg, Austria. The purpose of interpretation with two sampling methods, stratified sampling and unstratified sampling, on B & W infrared photos, with a scale of 1:10,000 was to know coniferous stand volumn and to reduce the cost, Forest stands were classified into 4 groups; those were non-forest, young stands, beech, coniferous stands. Coniferous and beech stands were devided into age classes I (41-80 years), II (above 81 years). After this delineation sample points were designated on the orthophoto map whose data were transferred from the aerial photos. The volumn data were calculated from DBH using relascope in the field and the results were as follows. 1) Coniferous stand volumn per hactare was 470±31.9㎥ 2) The diameter distribution of C₁ was binomial, but C₂ showed normal distribution. 3) The stratified sampling method was better than unstratified sampling method.
산림토양내 질소의 양료화와 (養料化) 질산화에 관한 연구 : ion 교환수지의 처리 방법에 따른 질소의 흡수율 변화
이천용(Chun Yong Lee),David D . Myrold(David D . Myrold) 한국산림과학회 1990 한국산림과학회지 Vol.79 No.3
Soil N mineralization and nitrification can be measured conveniently using mixed bed (canon and anion) exchange resin bags. However, appropriate use of these resin bags requires pretreatment to avoid colorimetric interference and standardize N ion adsorption. Three pretreatments were evaluated : control (untreated), 2 M NaCl with a distilled water rinse, and 4 M NaCl. The 4 M NaCl treatment was effective at removing background levels of NH₄^+ and NO₃^-, but adsorbed low amounts (about 40%) of inorganic N from standard solutions. Untreated resin bags adsorbed a constant, higher amount of NO₃^- (60%), but did not remove background levels of NH₄^+. The 2 M NaCl treatment followed by a distilled water rinse performed best : it removed background NH₄^+ and adsorbed a constant amount of both NH₄^+ (70%) and NO₃^- (60%). Because the ion exchange resin is fairly expensive, we also tested if the resin bags could be reused. Resin bags were either loaded with NH₄^+ and ~i0- in the laboratory or incubated in soil in the field, desorbed with the 2 M NaCl treatment, and then loaded with standard NH₄^+ and NO₃^- solutions. Lab loaded resin bags adsorbed about 60% of inorganic N then loaded with 2.5 or 5.0 ㎎ N 1^(-1) and 70% when loaded at 10 or 20㎎ N 1^(-1), whereas reused field incubated bags showed the opposite adsorption efficiency. These results demonstrate that resin bags can give reproducible results, but care must be taken to evaluate the effect of pretreatment and potential for reuse.
고강력 폴리아크릴로니트릴 섬유의 열처리에 의한 미세구조변화(II)
방윤혁,이천용,조현혹,Bang, Yun-Hyuk,Lee, Chun-Yong,Cho, Hyun-Hok 한국섬유공학회 1995 한국섬유공학회지 Vol.32 No.5
The properties of carbon fibers made fiom PAN are controlled by the heat treatment conditions. The length changes during heat treatment of high strenffh homo-PAN and co-PAN(acrylonitrile/acrylamide : 9812wt%) fibers in nitrogen atmosphere were measured by monitoring the elongation-shrinkage behavior under variable loading from 0.02 to 0.1g/d. A few structure parameters such as aromaticity index and crystalline orientation etc. were determined for the fibers heat-treated by linear heating to 27$0^{\circ}C$. The onset temperature of the chemical shrinkage during heat treatment coincided with the one of the exothermic peak of DSC thermoyams. When PAN fibers are heated under variable loads, the fiber length changes by various ways, namely physcial shrinkage, balance-elongation and chemical shrinkage. The co-PAN fibers tend to shrink more readily than homo-PAN fibers in that the onset of chemical shrinkage of co-PAN is shified to lower temperature. The total shrinkage of PAN fibers decreased with increasing load.
모래밭 버섯 포자접종량과 (胞子接種量) 시비량에 (施肥量) 따른 소나무 화분파종묘의 (花盆播種苗) 생장촉진효과
구창덕,이원규,이천용,박승걸 ( Chang Duck Koo,Won Kyu Lee,Chun Yong Lee,Seung Kull Park ) 한국산림과학회 1986 한국산림과학회지 Vol.72 No.1
The effect of different inoculation amounts of Pisolithus tinctorius (Pt) spores and fertilizers on the growth of Pinus densiflora seedlings grown in fumigated or nonfumigated soils were tested in the: polyethylene pots. To infest the pot soil with Pt spores, the mixture of the spores with sterilized nursery soil was used after seeding. Eighteen months after inoculation, mycorrhizal formation was 42-70% in fumigated plus Korean-Pt inoculated pots, 60-70% in fumigated plus U.S.-Pt inoculated pots, and less than 1% in non-fumigated, Korean Pt inoculated pots. Growth enhancement effect of Pt spore inoculation was shown on only fumigated soil and the inoculation increased the seedlings height (8-38%), stem diameter (9-40%)and dry weight (6-73%). Especially 0.4g per pot application rate increased the height (30-31%), stem diameter (.23-28%) and dry weight (56-69%), while the 0.2g U.S. Pt spore per pot rate increased 26-38, 17-20 and 58-60%, for height, stem diameter, and dry weight respectively. At 1X fertilizer application rate (urea 2g, fused superphoshate 4g, and potassium chloride lg per pot), the 0.4g per pot rate resulted in more dry weight by 18% than that at 1; 2X rate. The result indicated that there is a need for further research on inoculating nonfumigated soil with Pt and that appropriate application rates of fertilizers and Pt spores are 1X and 0.2-0.4g per pot on fumigated soil, respectively.