• Journal of Plant Biology
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• 제23권2호
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• pp.45-48
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• 1980

Effects of habitat and substrate quality on decomposition rate of litters of Larix kaempferi and Quercus serrata were estimated in Kwangnung forest. The amount of organic matter under the canopy of Quercus serrata stand was higher than that under the canopy of Larix kaempferi. The loss constant of litters in the Larix kaempferi stand was higher than that in the Quercus serrata stand.

• The Korean Journal of Ecology
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• 제13권3호
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• pp.191-202
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• 1990

For the maximun yield of the forest trees in the forest management, the growth of annual ring area of the major forest trees was analysed in the four areas in South Korea. The time to the maximum productivity and the optimum cutting time for the maximum yield were estimated. The growth curve of annual ring area showed sigmoid like that of other organisms. Only the growth coefficient among the areas between Fraxinus rhynchophylla and Pinus koraiensis represented significance (5% level). The growth coefficient among forest trees between Pinus densiflora and Abies holophylla, Larix kaempferi and Carpinus laxiflora, Larix kaempferi and Quercus mongolica, Larix kaempferi and Quercus serrata, Larix kaempferi and Pinus koraiensis, and Larix kaempferi and Abies holophylla represented significance (5% level). Among eight forest trees, the time to maximum productivity (tm) of Larix kaempferi was the earliest (21.4 year), and Abies holophylla was the latest (91.9 year). The optimum cutting time for the maximum yield (tc) of L. kaempferi was the earliest (29.4 year) and that of A, holophylla was the latest (122.2 year) of all communities. The optimum cutting time for the maximum yield was 1.33 times as late as the time to the maximum productivity. If the growth of annual ring area as the forest tree for wood is regarded, L. kaempferi and P. densiflora are thought to be more economical than A. holophylla and P. koraiensis.

• Journal of the Korean Wood Science and Technology
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• 제43권2호
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• pp.196-205
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• 2015

The aim of this study was to evaluate the fuel characteristics of thermally treated wood chips of the Larix kaempferi C. As torrefaction temperature was increased ($200^{\circ}C$ to $300^{\circ}C$), the carbon content, calorific value, and mass loss of torrefied wood chips increased significantly. The torrefied wood chips were shown to have hydrophobic properties even when only treated by mild torrefaction. The energy required to grind torrefied wood chips was reduced by the torrefaction process. Different sizes of wood chips were used in this study; however, this produced almost no difference in the fuel characteristics of processed Larix kaempferi C, except in the distribution of ground wood particles. Similar results were observed when the wood chips were torrefied for different lengths of time (15 min to 60 min) at a constant temperature. Torrefaction was shown to have positive effects on the fuel characteristics of Larix kaempferi C, including improved energy density, storage, and grindability.

• 농업생명과학연구
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• 제45권1호
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• pp.9-14
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• 2011

Larix kaempferi is a tree with a major economic impact and is processed in large quantity every year in Korea. This study was carried out to collect basic data for the reasonable use of Larix kaempferi and to investigate the relation between anatomical properties and modulus of rupture (MOR) for heartwood and sapwood. As the length of earlywood tracheid and the radial wall thickness of earlywood tracheid and latewood tracheid increased, the modulus of rupture (MOR) increased, but decreased with increasing microfibril angle. Statistical analysis by the stepwise regression technique shows that the main factors affecting the modulus of rupture (MOR) of heartwood are the microfibril angle and the radial wall thickness of latewood tracheid, while those affecting MOR of sapwood are the length of earlywood tracheid and the microfibril angle.

• Journal of the Korean Wood Science and Technology
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• 제37권6호
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• pp.531-536
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• 2009

주요 국산 수종인 잣나무재와 일본잎갈나무재의 횡단면상 방사조직 밀도 및 접선단면상 복열방사조직 출현 빈도수에 대한 변이성을 조사하였다. 방사조직의 밀도는 잣나무재 4.6개/mm, 일본잎갈나무재 9.0개/mm로 일본잎갈나무재의 방사조직 밀도가 더 높게 나타났다. 또한, 방사조직 밀도는 수 부근에서 높았고, 수피 쪽으로 이행함에 따라 점차 감소하는 경향을 나타냈다. 한 연륜 내에서의 복열방사조직 출현 빈도수는 일본잎갈나무재가 잣나무재보다 높았다. 잣나무재의 복열방사조직은 복열의 수가 1세포고인 것(B+1)이, 일본잎갈나무재는 2세포고인 것(B+2)이 가장 많았다. 일반적으로 복열방사조직의 출현 빈도수는 조재부가 만재부보다 높았는데 일본잎갈나무재의 경우 복열의 수가 6~7세포고에 달하는 것(B+6~B+7)도 있었다. 본 연구 결과, 방사조직 밀도의 변이성은 성숙재와 미성숙재를 구분하는 기초 자료로뿐만 아니라 방사조직의 출현 빈도와 함께 두 수종을 식별하는 자료로도 활용될 수 있을 것으로 생각되었다.

• 한국산림과학회지
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• 제109권3호
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• pp.313-324
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• 2020

본 연구는 일본잎갈나무림과 침활혼효림의 입지환경이 산양삼 종묘의 초기 생육에 미치는 영향을 구명하기 위해 수행하였다. 일본잎갈나무림과 침활혼효림에 시험포지를 조성하고, 입지환경과 산양삼 종묘의 생육특성을 조사하였다. 입지환경 중에서 토양 유기물, 전질소, 양이온치환용량과 같은 토양특성은 일본잎갈나무림에 비해 침활혼효림에서 높게 나타났고, 산양삼 종묘의 생육특성 또한 일본잎갈나무림에 비해 침활혼효림에서 유의적으로 높게 나타났다. 시험포지 내 수종 비율, 토양특성, 산양삼 종묘 생육특성 간의 상관관계를 분석한 결과, 토양특성과 생육특성은 활엽수림의 비율과 유의적인 정의 상관관계를 보였고, 토양특성 중에서 유기물, 전질소, 양이온치환용량이 산양삼의 생육과 유의적인 정의 상관관계를 보였다. 본 연구에서는 일본잎갈나무림과 침활혼효림의 입지환경 중에서 임상과 토양특성이 산양삼 종묘 생육특성과 유의미한 상관관계를 보이는 것을 구명할 수 있었고, 본 연구의 결과를 바탕으로 향후 산양삼의 최적 재배지를 선정하는데 기초적인 자료로서 도움을 줄 수 있을 것으로 사료된다.

• Journal of the Korean Wood Science and Technology
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• 제34권1호
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• pp.1-6
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• 2006

국내에 가장 많이 조림된 수종이고 중요한 국산 목재자원인 잣나무와 일본잎갈나무 두 수종의 재질특성을 구명하기 위하여 수지구와 에피델리얼세포의 수간내 변이성을 조사하였다. 그 결과, 두 수종 간에 수직수지구의 수와 그 수의 방사방향 변이성에 차이가 있었다. 일본잎갈나무의 수평수지구의 직경 및 에피델리얼세포 수도 방사방향으로 변이성을 나타냈다. 즉 미성숙재부와 성숙재부간에 수지구와 에피델리얼 세포의 출현특성이 차이가 있었다. 결론적으로, 잣나무와 일본잎갈나무에 있어서 수지구와 에피델리얼세포의 출현특성을 성숙재부와 미성숙재부로 구분하는 재질지표로 이용할 수 있을 것으로 생각하였다.

• 한국가구학회지
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• 제28권1호
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• pp.88-93
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• 2017

A study was carried out to observe the 1% aqueous safranine solution flow speed in longitudinal and radial directions of softwood Larix kaempferi (Lamb.)Carriere, diffuse-porous wood Betula davurica Pall.. and ring-porouswood Castanea crenata S.etZ. In radial direction, ray cells and in longitudinal direction, tracheids, vessel and wood fiber were considered for the measurement of liquid penetration speed at less than 12% moisture contents (MC). The length, lumen diameter, pit diameter, end wall pit diameter and the numbers of end wall pits determined for the flow rate. The liquid flow in the those cells was captured via video and the capillary flow rate in the ones were measured. Vessel in hardwood species and tracheids in softwood was found to facilitate prime role in longitudinal penetration. Anatomical features like the length and diameter, end-wall pit numbers of ray parenchyma were found also responsible fluid flow differences. On the other hand, vessel and fiber structure affected the longitudinal flow of liquids. Therefore, the average liquid penetration depth in longitudinal tracheids of Larix kaempferi was found the highest among all cells considered in Betula davurica and Castanea crenata, In radial direction, ray parenchyma of Larix kaempferi was found the highest depth and the one of Betula davurica was the lowest. The solution was penetrated lowest depth in the wood fiber of Castanea crenata. The large vessel of Castanea crenata was found the lowest depth among the vessels. The solutin was penetrated to the wood fiber of Betula davurica higher than the one of Castanea crenata.

• 한국가구학회지
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• 제27권4호
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• pp.302-308
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• 2016

It has been known that acetylation improves the dimensional stability of wood. Liquid phase acetylation is more popular than gas-phase acetylation for the effectiveness of weight gain of wood. In this study the specimens of domestic red and Korean pines are acetylated in liquid phase and their physical properties, such as density, bending strength, anti-hygroscopicity etc., are analyzed. Acetylation increases the average weights and volume of larch specimens by 11.4% and 3.4%, respectively, and their average oven-dry densities are increased by $0.03g/cm^3$. Acetylation does not influence on Modulus of Rupture (MOR) and Modulus of Elasticity (MOE). The average Percentage Reduction in Hygroscopicity (PRH) and average Percentage Reduction in Water soaking (PRW) of larch specimens are respectively 20.2% and 20.8%. Thus it can be concluded that acetylation improves the dimensional stability of larch specimens.

• Journal of Forest and Environmental Science
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• 제31권3호
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• pp.202-206
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• 2015

Site index curves were developed for Larix kaempferi and Pinus koraiensis in Gangwon and North Gyeongsang provinces in Korea. For the development of site index, Schumacher and Chapman-Richards model were applied using the data collected from 2012 to 2014. Base age was set to 40 years for Larix kaempferi and Pinus koraiensis in site index of this study. Coefficient of determination and root mean square error of site index models were provided by species, and the models were compared with the previous studies to check the suitability. Overall, site index models developed in this study fitted in the current data well. Thus, the site indexes are considered to be properly used in Gangwon and North Gyeongsang provinces.