http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
송승달,고재기 ( Seung Dal Song,Jae Kee Koh ) 한국하천호수학회 1978 생태와 환경 Vol.11 No.3·4
The dynamics of physico-chemical and hydro-biological characteristics were examined on the 4 stations of Shinchuen water system in Taegu from March to September in 1978. The ranges of concentration variations of water environmental matters were as follows: 5.7∼9.40 for pH, 0.59∼12.4 ppm for DO, 0.7∼36.9 ppm for BOD, 5.01∼114 ppm for COD, 0.007∼2.2 ppm for PO₄, 10∼135 ppm for Cl^-, 0.03-20.4 ppm for NH₄^+, 0.17∼8.90 ppm for NO₂^-, 7.4∼222 ppm for NO₃^-, 8.01∼80.1 ppm for Ca^(++), 22∼214 ppm for Alkalinity and 0.003∼0.275 ppm for Surfactants. To demonstrate total loads of important pollutants, the flow rates of the stream were multiplied by the respective concentrations of the matters. The estimations of the maximum loads by Taegu population were 18.2, 69.9, 0.50, 86.7 and 0.241g per person per day, respectively for BOD, CUD, PO₄, Cl^- and Surfactants. Dominant populations in the upper clean stream were phytoplanktons of Chlorella sp., Spirogyra sp. and fishes of Moroco oxycephalus, Misgurnus mizolephis. But more tolerant populations Oscillaloria sp., Phormidium sp., Nitzschia sp., Navicular sp. and Vorticella sp. dominated in the lower polluted stream.
송승달 (Seung Dal Song) 한국식물학회 1975 Journal of Plant Biology Vol.18 No.3
The nitrogen economy and primary production of a Helianthus annuus Man-churian population were studied with special reference to the pattern of seasonal changes of vertical distributions of dry matter and nitrogen quantities, and its quantitative significance was discussed in relation to the pattern of the plant poulation growth, distribution ratios among organs, and turnover rates of dry matter and nitrogen. The population was established in plant density of 11.1 plant/㎡ at the experimdntal field of Kyungpook National University, Daegu. During the period of population development(April-September, 1973), the annual inflow rates and outflow rates of dry matter and nitrogen were 5560 gDM/㎡ year and 89 gN/㎡/year, respectively. The distribution ratios of dry matter and nitrogen to leaves were 28% and 45%, to stems 48% and 18%, to roots 13% and 5%, and to flowers and seeds 11% and 32%, respectively. The maximum turnover rates of inflow of dry matter and nitrogen were attained in May-June, and were 216%/month and 210%/month, respectively. The amount of nitrogen demand was 52gN/㎡/year(58%) for the foliage growth, 13 gN/㎡/year(15%)for the stem growth, 20 gN/㎡/year(23%) for the reproductive organs, and 4 gN/㎡/year(4%) for the growth of the underground parts. The amount of nitrogen supply by the nitrogen with-drawn from senescing leaves and stems was 25 gN/㎡/year(28%) and the amount of nitrogen absorption by the root from the environmental soil was 64 gN/㎡/year(72%). The ratio of the a mount of produced dry matter to that of assimilated nitrogen during a year was calculated for this annual plant population as 60, which can be used as the nitrogen utility index.
보리수나무 유식물의 생장과 질소고정 활성에 대한 환경요인의 영향
송승달(Seung Dal Song),박태규(Tae Gyu Park),안정선(Chung Sun An),김준호(Joon Ho Kim) 한국식물학회 1994 Journal of Plant Biology Vol.37 No.3
Effects of environmental factors of light, temperature, nitrogen sources and water stress were analyzed quantitatively on the nodule formation and nitrogen fixation activity of autumn olive plant (Elaeagnus umbellata Thunb.) during the seedling growth. Seedlings showed the maximum nitrogenase activity of 72.5 μM C_2H_4·g fr wt nodule^1·h^1 in the early nodulation stage. The relative growth rate and T/R ratio changed from 1.60%·d^1 and 1.12 in the earlier stage to 3.75%·d^1 and 2.31 in the later stage, respectively. Light conditions of 20-25, 10-15 and 4-6% resulted in decreases of 41, 54 and 71% of the nitrogenase activity, respectively. Nodules incubated in 15, 20, 25 and 30℃ showed the activities of 5.4, 24.7, 51.6 and 58.5 μM C_2H_4·g fr wt nodule^1·h^1, respectively. Pretreatment with low temperature (15℃) followed incubation at 30℃ attained higher nitrogenase activity (66.5μM C_2H_4·g fr wt nodule^1·h^1) than that with higher temperature (35℃). The oxygen pressure above 16kPa is necessary for saturation of the nodule activity, but the activity was inhibited severely by physical impact such as the exision or isolation of nodules from the root. The relative activities of early nodules grown in pH 5.5, 6.5 and 8.0 were 89, 100 and 40% and those grown in 1 and 3 mM of NO_3 and NH_4 were 6, 1 and 68, 50%, respectively. Watering levels of 20, 50 and 100 mL during the seedling growth resulted in 35, 120 and 8 ㎎ of nodule formation and 33.6, 58.4 and 8.4 μM C_2H_4·g fr wt nodule^-1·h^-1 of the nitrogenase activity, respectively. Water stress with 86% decrease of soil water content caused temporary wilting point of leaf and a complete disappearance of nitrogenase activity of nodules, though the water content and transpiration rate in plant were reduced to 90 and 53%, respectively.
아연환경구배에 (亞鉛環境勾配) 의한 녹조류개체군생장의 생태학적 특성
송승달 (Seung Dal Song) 한국식물학회 1977 Journal of Plant Biology Vol.20 No.3
The maximum relative growth rate of algae treated with Zinc was shown as follows: 15,8,6,3 and -5% per day for the rather sensitive Chlorella sp. populations, or 14,7,5 and 4% per day for the Pleurococcus sp. populations, and 22,20,13,9 and 7% per day for the more resistant Scenedesmus spinosus populations, respectively for the culture medium with 0,1,5,10 and 20 ppm of Zinc treatment. With mixed cultures of Chlorella sp. and Scenedesmus spinosus populations, the growth of the Chlorella sp. population overcame that of the S. spinosus population from the cultures treated with relatively low concentration of Zinc. On teh contrary, the population growth of the latter resistant species overcame that of the former sensitive species when the concentration of Zinc was above 5 ppm Zn of the medium. This paper describes the results of further investigations of the effects evaluated by direct cell counts method, optical density comparisons, oxygen production and consumption determination and the measurements of the fate of Zinc treated in the solutions.