Wisconsin 주의 Red Pine 생태계의 Biomass 와 Net Primary Production 에 관한 연구

이수욱,Bockheim, J. G. 한국임학회 1983 한국산림과학회지 Vol.59 No.1

Wisconsin州의 酸性水河堆土에 生成된 Plainfield loamy sand (Typic Udipsamment)에 生長하고 있는 34年生 Red Pine (Pinus resinosa) 間伐造林地內에 있어서 Biomass와 Net Primary Production (NPP)을 推定하였다. 間伐林과 非間伐林間의 推定値를 比較하고 差異를 유발시키는 要因으로 樹幹의 比重과 Form Factor에 의한 영향을 계산하였다. 1) 34年生 Red Pine 間伐林의 Biomass와 NPP는 각각 97.3Mg/ha와 11.5Mg/ha/yr이었다. 2) 推定方程式을 比較해 볼 때 間伐林과 非間伐林間에는 樹木各部分別로 Biomass의 差異가 있었다. 3) 以上의 差異는, ① 樹幹 (樹皮 제외)의 比重 (Basic Specific Gravity)의 差異와, 間伐로 인한 Form Factor의 差異로 인하여 發生한 것이다.

재무분석가의 예측수정에 대한 연구

이수욱 광운대학교 기업경영연구소 1996 기업경영연구 Vol.4 No.-

鷄龍山 森林植生分布와 土壤水分과의 關係

南怡,李壽煜 忠南大學校 環境問題硏究所 1988 環境硏究 Vol.6 No.2

The result of studies on the relationship between the distribution of forest vegetation and soil moisture content in Mt. Gyeryong is as follows; 1. During the growing season forest soil moisture contents of each vegetation community was 42.6% in Quercus mongolica community, 31.7% in Pinus densiflora community, 25.9% in Quercus variabilis community, and 25.2% in Carpinus laxiflora community, respectively. 2. Accoridng to the amount of precipitation, the range of forest soil moisture fluctuation from wet period to dry period was 49.8∼25.1% in Quercus mongolica community and 32.7∼20.0% in Pinus densiflora community. 3. With to the increase of altitude, forest soil moisture content decreased from top soil to subsoil in each vegetation community but soil moisture contents between soil depths did not have statistical differences. 4. During dry season, forest soil moisture content had changed by the distribution of each forest vegetation community but soil moisture content by soil depth had statistical difference in only Pinus densiflora community.

Red Pine(Pinus resinosa Ait.) 間伐地의 Biomass와 Net Primary Production(NPP)에 關한 硏究

李壽煜 충남대학교 농업과학연구소 1983 農業技術硏究報告 Vol.10 No.2

Dimension analysis was used to estimate biomass and net primary production(NPP) in a 35-year-old red pine (Pinus resinosa Ait.) plantation in central Wisconsin, U. S. A.. Total aove ground biomass was estimated at 97.3Mg ha^-1. Organic matter was distributed in the red pine stand as follows : bolewood 67.8%, live branches 15.4%, foliage 8.4%, bole bark 6.1%. Net primary production was estimated at 11.5Mg ha^-1 yr^-1 and was distributed : bolewood 30.4%, foliage 25.2%, branches 36.5%, bole bark 2.6%. There were differences in total biomass and proportion of biomass components when using the three equations. These differences are due to : a) difference in bolewood specific gravity and b) the effect of thinning on the form factor.

造景樹木의 大氣汚染物質에 대한 防禦機能 : SOD 活性을 중심으로 Superoxide dismutase Activity

金明姬,李壽煜 中部大學校 農業開發硏究所 1993 農業開發硏究論文集 Vol.2 No.-

造景樹木들의 大氣汚染物質들에 대한 感受性 및 抵抗性을 규명하기 위해서 野外調査와 室內實驗을 통하여 葉內 硫黃含量과 superoxide dismutase (SOD) 含量을 測定 分析하였다. 全 樹種에서 葉內 硫黃含量과 SOD 活性間에 正의 相關을 나타내었다. 植物體가 汚染物質에 대하여 自體防禦를 위하여 初期에는 酵素活性을 增大시키지만, 植物體의 收容限界를 넘을 때는 오히려 酵素의 失活과 함께 植物體가 被害를 받았다. 闊葉樹는 大氣汚染物質의 淨化能力이 큰 반면 針葉樹는 汚染物質에 대한 防禦能力이 크게 나타났다. 葉內 SOD 活性은 非汚染 地域과 汚染地域間에 差異가 뚜렷하였는데, SOD 活性은 闊葉樹에 비하여 針葉樹에서 높게 나타났으며, 소나무보다는 잣나무에서 活性이 높았으며, 튜립나무는 은행나무와 양버즘나무보다 낮은 것으로 나타나 SOD 活性이 높은것이 大氣汚染物質에 대한 耐性이 强함을 알 수 있다. This study was conducted to determine the toxic effects of air pollutants on landscaping trees, Pinus densiflora, Pinus koraiensis, Ginkgo biloba, Liriodendron tulipifera, Platanus occidentalis and their resistance to the pollutant toxicity in urban and industrial regions of Seoul and Taejon, Korea. Total sulfur contents and superoxide dismutase (SOD) activity were analysed in tree foliage of Pinus densiflora, Pinus koraiensis, Ginkgo biloba, Liriodendron tulipifera, Platanus occidentalis. In all species total sulfur content and SOD activity had a positive correlation. Air pollutants accumulated in tree tissues were supposed to enhance the enzyme activity like SOD providing with the resistance mechanisms. Trees under the air pollution stress increased enzyme activity to develop internal self-resistance against pollutants, but after a critical point enzyme activity decreased gradually and resulting in injury after all. Deciduous trees had greater filtration capacity than conifers and coniferous trees showed greater resistance against air pollutants than deciduous species. Foliage SOD activity was higher in polluted area than in unpolluted area for most species. Coniferous species and mature trees had higher SOD activity than deciduous seedlings. Especially Pinus koraiensis, Ginkgo biloba and Platanus occidentalis han higher SOD activity than other species. The tree species with the high SOD activity showed strong resistance against air pollutants. Changes of SOD activity was different between species and in most species SOD seemed to participate in resistance mechanism.

성과평가와 보상체계

이수욱 광운대학교 기업경영연구소 1997 기업경영연구 Vol.5 No.-

農科大學 扶餘 演習林의 植生調査

李壽煜,金智文,宋鎬京 충남대학교 농업과학연구소 1977 農業技術硏究報告 Vol.4 No.2

The experimental forest of Chungnam National University is located in Naryung-Ri, Eunsan-Myen, Buyeo-Gun, Chungcheongnamdo. The climax vegetations of Quercus species grown in central temperate zone are supposed to be destroyed before pure pine stands as a semi-climax vegetation are established on the southern aspect and along the ridges. Variability of vegetations is rather high and dominant species are such as Pinus densiflora, Quercus acutissima, Quercus variabilis, Quercus aliena, Quercus serrata, Lindera erythrocarpa, Platycarya strobilacea, and so on. There are 203 woody plants and 128 herbal plants. According to the use of vegetations they can be classified as follows; 60 familia and 154 species for edible source, 63 familia and 143 species for medicinal, 51 familia and 140 species for forage, 32 familia and 78 species for ornamental, and 12 familia and 27 species for timber source.

차세대 인터넷 도입을 위한 경계 라우터의 성능분석에 관한 연구

이수욱,황성호,임해진 三陟大學校 2004 論文集 Vol.37 No.-

The IPv6(Internet Protocol version 6), a next generation internet protocol. was standardized to solve the problems of the IPv4(Intemet Protocol version 4). However. the IPv4 could not be actually converted to the IPv6 at one time. Therefore. the transition mechanism is thought to be very much important to be compatible with the IPv4 naturally and convert to the IPv6 network gradually. Despite of the development of various kinds of the transition mechanism, the IPv6 network was not expanded. The research was mainly made not for current system environment but for technical purposes. This paper investigated the performances through the transition mechanism and examined proper ways being applicable to current environment.

대기오염 및 산성우가 (酸性雨) 삼림생태계의 토양산도 (土壤酸度) 및 양료분포에 (養料分布) 미치는 영향

이수욱,민일식 ( Soo Wook Lee,Ill Sik Min ) 한국산림과학회 1989 한국산림과학회지 Vol.78 No.1

Four regions have been selected and surveyed to investigate the effects of air pollution and acid deposition on forest ecosystem. They were Seoul as urban region, Yeochon and Ulsan as industrialized region, and Kangwondo as uncontaminated region. Soil pH and the distribution of elements were analyzed in process of time for three years as well as by distance from pollution sources. In general, forest soils acidified in process of time from pollution sources to suburban areas. Hydrogen ion concentration in forest soils increased in 1988 as much as 60% of that in previous year. Average soil pH values in coniferous forest were 4.45 in Seoul, 4.54 in Yeochon, 4.81 in Ulsan, and 6.03 in Kangwondo. Forest soil pH increased with the distance from pollution sources to suburban areas at constant rate within short ranges (up to 30 ㎞) and at decreasing rate within long ranges (up to 200 ㎞). On the contrary, sulfur content in soils decreased every year except in Yeochon region. Base saturation of forest soils in polluted regions were all below 20% level compared with 70% in Kangwondo region. Active aluminum content in soils increased with the soil acidification at the highest rate in Yeochon, and the next in Ulsan and Seoul, Heavy metal content such as copper and zinc in tree tissues were the lowest in Kangwondo region, and the next in Yeochon, Seoul and Ulsan.

都市에서 發生되는 大氣汚染物質이 森林生態界에 미치는 局所的 影響

張寬淳,李壽煜 忠南大學校 環境問題硏究所 1987 環境硏究 Vol.5 No.2

本 調査는 各種 産業施設과 都市人口, 交通量이 密集되어 있는 大田市 地域에서 發生하는 汚染物質이 森林에 미치는 影響을 局所的으로, 季節的으로 分析하여 다음과 같은 結論을 얻었다. 1. 大田市에서 發生되는 大氣汚染物質의 影響은 大都市 中心部로부터 거리가 멀어짐에 따라 減少하였다. 2. 酸性雨(Acid Precipitation)의 影響에 의한 土壤 pH는 季節別로 여름보다 겨울이 낮았다. 3. 大都市에서 工團地域의 固定汚染源과 車輛運行이 빈번한 移動汚染源을 中心으로 排出되는 汚染物質이 森林土壤의 表土pH에 미치는 季節別 影響은 그 類型이 8月에 이르러 다르게 나타났다. 4. 固定汚染源이 集中的으로 排出되는 工團地域에서 土壤汚染의 擴散은 거리에 따라 뚜렷이 減少했다. 그 擴散率 Model은 Y=3.75+0.0013X와 같다. 5. 移動汚染源 地域에 있어서 土壤汚染의 擴散은 季節別 距離別로 뚜렷하며 8月에 현지히 增加했다. 그 擴散率 Model은 Y=4.54+0.00015X와 같다. The experiment has been made to find out the local effects of air pollutants from urban area on forest ecosystem. According to the distance from city center, 5 sample locations were selected. The influence of air pollutants from urban area decreased with increasing distance from city center. The soil pH by acid precipitation was lower in the winter than in the summer. The seasonal fluctuations of top-soil pH by industrial and traffic influences had a different pattern in August. The dispersion rate of soil contamination from industrial area significantly decreased according to the distance from pollution source (Y=3.75+0.0013X). The dispersion of soil contamination by heavy traffic showed significant seasonal changes and the most significant increase was in August(Y=4.54+0.00015X).