참나무류 4개 수종(신갈나무, 굴참나무, 상수리나무, 떡갈나무)의 맹아발생력 및 맹아생장량

이돈구 서울대학교 농업개발연구소 2000 농업생명과학연구 Vol.4 No.-

This study was carried out to compare sprouting and sprout growth after the stumps of four Quercus spesies (Q. mongolica, Q. variabilis, Q. actuissima and Q. dentata) were cut at 20cm from the soil surface in 1996 and 2000 at Mt. Taehwa, Kwangju-Gun, Kyonggi-Do, Korea. The results obtained were as follows: (1) Q. mongolica showed most vigorous sprouting and followed by Q. variabilis, Q. dentate, and Q. acutissima. (2) The sprouting ability was more vigorous when cut in winter to early spring than that in summer. (3) The initial diameter growth of the sprouts for 2 years after cutting was the highest in Q. acutissima and followed by Q. dentata, Q. mongolica and Q. varivabilis, but the growth for 5 years after cutting was Q. variabilis > Q. mongolica > Q. dentate > Q. acutissima (4) The height growth of sprouts for 2 years after cutting was the highest in Q. acutissima and followed by Q. mongolica, Q. dentata and Q. variabilis, but the growth for 5 years after cutting was Q. variabilis > Q. mongolica > Q. dentata > Q. acutissima. (5) Tending is needed if the stands of Q. variabilis and Q. acutissima are regenerated successfully by sprouting. (6) The sprouting ability of Quercus species decreased with increasing stump diameter, while its diameter growth seemed to increase.

조림작업에 의한 산림생태계의 물질순환 및 생물다양성 변화

이돈구 서울대학교 농업개발연구소 1999 농업생명과학연구 Vol.3 No.-

This study was conducted to investigate how the application of silvicultural treatments in the forest ecosystem would influence the population of birds and mammals among the various forests at Suwon and Kwangju-Gun, Kyonggi-Do. In the site where thinning was executed recently, the number of bird species and their density were lower than the site where thinning was executed five years ago. However, as recent-thinning area has been compared by new thinning technique which has the shrub layer and valley region of the forest, the number of observed birds was higher in recent thinning area. Thinning seemed to affect stand growth, especially diameter growth of overstory trees. The stands of P. koraiensis, which were thinned or understory-controlled showed relatively good growth compared to other stands. Silvicultural treatments, such as thinning or understory vegetation-controlled, resulted in weight loss of litter in the forest floor, indicating that the treatments helped store more nutrients in the above ground biomass rather than on forest floor.

몇 소나무類의 葉綠素 含量의 月別 變化

李慶學,金甲泰,朱洸영,曺炅眞,李敦求 서울大學校 農科大學 1985 서울대농학연구지 Vol.10 No.2

植物體는 生存 또는 生長을 위해 光合成作用을 하며, 綠色植物은 이를 위한 色素로서 葉綠體를 가지고 있다. 따라서 이의 含量은 生長能力이나 各種 stress에 대한 生理的 活成變化를 나타내는 指標로 이용되는데 이에 對한 硏究報告는 基礎的 資料로서의 重要性에도 불구하고 林木 특히 소나무類에 있어서는 극히 드물었다. 이에 서울大學交 農科大學 構內에 있는 소나무類 5樹種에 對한 針葉單位生重量當 葉綠素含量을 月別測定한 結果 樹種間의 含量差異는 뚜렷하니지 않았으나 測定時期間에는 差異를 보였다. 總葉綠素의 含量變化는 葉綠素 a의 含量變化에 起因하며 이는 여름철에는 높고 겨울철에는 낮았다. 또한 最大値는 2年生 針葉을 7, 8月에 測定했을 때 나타났다. 이러한 結果를 綜合해 볼 때 소나무類의 生理的 生活은 葉綠素 a와 密接한 關係를 갖고 있는 것으로 思料된다. To obtain the fundamental data about the chlorophyll contents of some conifers, monthly measurements of them per unit fresh weight(g) of needles were performed. The results were summarized as follows. 1. Difference of total chlorophyll contents between measuring times in a species was clear but not between species. Total chlorophyll content in summer showed high value and that in winter did low value. 2. In general, the total chlorophyll contents of the conifers showed the highest values in two-year-old needles, measured in July or August. 3. Monthly change of total chlorophyll contents was mainly due to that of the contents of chlorophyll a, and the contents of chlorophyll b was not varied greatly with measuring times. 4. It seems that the physiological activity of needles was closely related with the contents of chlorophyll a.

15年生 잣나무 林分에서의 樹冠部位別 葉綠素含量의 季節的 變異

金甲泰,李敦求 서울大學校 農科大學 1986 서울대농학연구지 Vol.11 No.1

The variations in needle chlorophyll contents were examined among needle ages, during the growing season, and among the crown heights of 15-year-old Pinus koraiensis growing at Usandong, Wonju, Kangwon-do. Measurement was done from June 1985 to March 1986. The results obtained are as follows: 1. The differences in needle chlorophyll contents were significant among needle ages during the growing season whereas those were not significant among the crown heights. 2. The change in total chlorophyll contents was mainly influenced by the contents of chlorophyll a. 3. The content of chlorophyll b increased with increasing needle age. 4. The highest chlorophyll contents were observed from the needles located at the middle portion of the crown height.

Growth Response of Alnus hirsuta Seedlings after Artificial Inoculation with VA - mycorrhizal Fungi

Don Koo Lee,Kwang Yeong Joo 한국임학회 1986 한국임학회 정기학술발표논문집 Vol.1986 No.-

This study was to examine the growth of Alnus hirsuta seedlings after artificial inoculation with two kind of VA-mycorrhizal fungi, Glomus mosseae and Gigaspora sp., under three different soil textures, sandy soil, loamy soil (sandy: clay = 1 : 1, v/v), and clay soil The seedlings inoculated with Glomus showed the increased leaf area, leaf number height growth, photosynthetic activity, and nutrient absorption. The dry weight was 4.5 or 4.7 times heigher than that of control in sandy soil and clay soil, respectively. However, the growth in loamy soil response was not greater than the control. The nutrients absorption was increased by Glomus inoculation. The growth and nutrient absorption were not improved by Gigaspora inoculation, indicating that the mycorrhizal association between Alnus and Gigaspora was poor. The differences in nutrient concentration were not significant between mycorrhizal and non-mycorrhizal seedlings in all soil textures. Glomus showed high inoculum rate and increased the Alnus growth. Whereas Gigaspora showed poor hyphal development and did not affect the growth of Alnus. The results obtained in this study indicated that careful selection of best strain of VA-mycorrhizal. fungi and proper soil texture are recommended to improve the growth of Alnus seedlings.

Effects of Frankia Ar I3 on the growth and biomass production of Alnus seedlings at low light intensity

Don Koo Lee 한국임학회 1986 한국임학회 정기학술발표논문집 Vol.1986 No.-

Five species of Alnus seedlings (A. hirsuta, A. inokumae and A. firms from Korea, A. incana from Sweden and A. glutinosa from Norway) were compared to examine growth, nitrogen productivity, net photosynthesis rate and nitrogen fixation at regulated addition rate of nutrients and under low light intensity. Inoculated seedlings produced more biomass than uninoculated seedlings, and it was especially true In leaf biomass production. More dry matter and nitrogen were distributed to leaves than other plant parts, and it was apparent for inoculated seedlings. A. glutinosa, A. incana and A. hirsuta were better in nitrogen productivity than A. inokumae and A. firms both when inoculated and uninoculated. A. incana, A. glutinosa and A. hirsuta were also better in net photosynthesis rate than A. inokumae and A. firms both for inoculated and uninoculated seedlings. For nitrogen fixation, however, A. hirsuta and A. inokumae were the best among five species.

Water Use Efficiency in Five Different Species of One-year-old Seedlings Grown in a Field Nursery in Mongolia

Lee, Don-Koo,Park, Yeong-Dae,Batkhuu, Nyam-Osor Korea Association For Quaternary Research 2003 제사기학회지 Vol.17 No.2

This study was conducted to examine the water use efficiency (WUE) in five species of one-year-old seedlings grown in a field nursery in Mongolia. Larix sibirica and Pinus sylvestris are the most dominant coniferous species while Ulmus pumila is an important deciduous species known well-adapted in harsh conditions such as in semi-arid forests and Gobi desert regions. Caragana arborescens (Siberian pea shrub) and Hippophae rhamnoides are N-fixing shrubs in Mongolia. Thirty one-year-old seedlings were sampled from each of the five species (a total of 150 samples) and measured for net photosynthetic rate (Pn) and transpiration rate (E). The Pn and E were used to calculate and compare the WUE of each species. Pn differed significantly among the five species (p < 0.05). However, there was no significant difference in Pn between L. sibirica and H. rhamnoides (p > 0.05). C. arborescens showed the highest Pn whereas U. pumila did the poorest. E differed significantly among the five species (p < 0.05). L. sibirica and U. pumila showed considerably lower E than other species. Thus, WUE values of coniferous species such as L. sibirica and P. sylvestris were significantly greater than deciduous or shrub species such as U. pumila, C. arborescens and H. rhamnoides (p < 0.01). It may result that conifers showed relatively high water use efficiency than deciduous or shrub trees due to their lower transpiration rates, which resulted in morphological and physiological characteristics of their leaves. This may indicate that L. sibirica and P. sylvestris can be widely used for rehabilitation works in Mongolia attributed to their dominant distributions but also their high drought-resistance properties.

SAMPLING AND ESTIMATION OF HYBRID POPLAR LEAF SURFACE AREAS

Lee, Don Koo,Lee, Kyeong Hack 한국임학회 1984 한국산림과학회지 Vol.65 No.1

Two sampling procedures were compared to examine the effectiveness of the variable, leaf length times leaf width, in estimating total leaf surface areas of Populus alba × Populus glandulosa F₁ clones. The variable appeared reliable for estimating the leaf surface area. Stratified random sampling proved efficient for the estimation of the areas of both fast-growing and less fast-growing clones. For better estimation of leaf surface areas, more samples should be allocated to long branches than either main stem or short branches during the early growing season. During the late growing season, however, those should be allocated more to main stem and long branches because of many leaves retained. Leaf surface areas per leaf did not show clonal differences for both one - and two-year-old trees, but those per tree did clonal differences.

학술연구 발표논문집 : 포스터 발표 ; 상주대학교 애일당 안 : 필리핀 마킬링산에서 교목성 치수의 생장과 분포

( Don Koo Lee ),( Yong Kwon Lee ),( Su Young Woo ),( Kwan Ho Bae ),( Yeon Sook Choung ),( Do Soon Cho ),( Youn Ho Jang ),( Marilyn Sabalvaro ) 한국임학회 2003 한국임학회 정기학술발표논문집 Vol.2003 No.-

Insulin-Inducible SMILE Inhibits Hepatic Gluconeogenesis

Lee, Ji-Min,Seo, Woo-Young,Han, Hye-Sook,Oh, Kyoung-Jin,Lee, Yong-Soo,Kim, Don-Kyu,Choi, Seri,Choi, Byeong Hun,Harris, Robert A.,Lee, Chul-Ho,Koo, Seung-Hoi,Choi, Hueng-Sik American Diabetes Association 2016 Diabetes Vol.65 No.1

<P>The role of a glucagon/cAMP-dependent protein kinase-inducible coactivator PGC-1 signaling pathway is well characterized in hepatic gluconeogenesis. However, an opposing protein kinase B (PKB)/Akt-inducible corepressor signaling pathway is unknown. A previous report has demonstrated that small heterodimer partner-interacting leucine zipper protein (SMILE) regulates the nuclear receptors and transcriptional factors that control hepatic gluconeogenesis. Here, we show that hepatic SMILE expression was induced by feeding in normal mice but not in db/db and high-fat diet (HFD)-fed mice. Interestingly, SMILE expression was induced by insulin in mouse primary hepatocyte and liver. Hepatic SMILE expression was not altered by refeeding in liver-specific insulin receptor knockout (LIRKO) or PKB beta-deficient (PKB beta(-/-)) mice. At the molecular level, SMILE inhibited hepatocyte nuclear factor 4-mediated transcriptional activity via direct competition with PGC-1 alpha. Moreover, ablation of SMILE augmented gluconeogenesis and increased blood glucose levels in mice. Conversely, overexpression of SMILE reduced hepatic gluconeogenic gene expression and ameliorated hyperglycemia and glucose intolerance in db/db and HFD-fed mice. Therefore, SMILE is an insulin-inducible corepressor that suppresses hepatic gluconeogenesis. Small molecules that enhance SMILE expression would have potential for treating hyperglycemia in diabetes.</P>