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.

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.

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.

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.

Effects of Coppicing on the Growth and Distribution of Hybrid Poplar Roots

Lee, Don-Koo 서울大學校 農業生命科學大學 附屬樹木園 1994 서울大學校 樹木園 硏究報告 Vol.- No.14

맹아유도(coppicing)는 두 지역의 잡종 포플러 식재지에서 모든 클론과 모든 식재밀도에서 뿌리 생장을 현저히 감소시켰다. 총뿌리 무게를 비교해 볼 때 lowa 식재지가 Wisconsin 식재지보다 훨씬 컸다. 가장 낮은 식재 밀도(ha 당 5000그루)에서 뿌리의 무게가 가장 컸다. 클론 5323호가 맹아유도하기 전에는 뿌리의 무게 생장이 가장 우수했으나 맹아유도 후에는 클론 5377호가 가장 우수했다. 표본을 추출(core sampling)하여 얻은 결과로 볼 때, 뿌리의 무게는 지표층(상층)토양과 나무 줄기 주위에 가장 많이 집중되어 있었다. 이 연구에서 토양층을 보다 효과적으로 이용할 수 있다는 점에서 뿌리 뻗음이 다른 특성을 가진 클론을 같이 혼식하는 것을 추천한다. Coppicing markedly reduced root growth for clones and densities of hybrid poplar at two locations. Larger total root weight was shown for the Iowa plot than for the Wisconsin plot. The lowest density yielded the larger root weight. Clone NC-5323 produced the largest total root weight before coppicing, whereas clone NC-5377 produced the largest after coppicing. Results obtained by core sampling indicated that most root weight was concentrated in the top soil and near the tree stem. Mixed planting of clones having different rooting habits is suggested for better utilization of soil horizons.

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.

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.-

필리핀 마킬링산지역 초지에서 인공조림이 수종의 구성과 미세기후에 미치는 영향

( Don Koo Lee ),( Yong Kwon Lee ),( Su Young Woo ),( Emmanuel Rodantes G. Abraham ),( Youn Ho Jang ),( Amelita C. Luna ) 한국임학회 2004 한국임학회 학술발표논문집 Vol.2004 No.-