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낙동강하구에 있어서 지하수위에 따른 식물군락의 연속구조와 종이양성지수의 변화에 관한 연구
장남기,강병찬 ( Nam Kee Chang,Byung Chan Kang ) 한국축산학회 1977 한국축산학회지 Vol.19 No.6
Changes of the distribution of plant communities and species diversity on the gradient of the water table in the delta of the Nakdong-river were studied by means of the method of Curtis and Patten, and the index of Shannon and Wiever. The communities were arranged in a single dimensioned ordination on the basis of the importance values of the persistent species. Leading dominant species from the low, level to the high level of the water table gradient, were Phragmites longivalvis, Cyperus flaridus, Ischaemum anthephoroides var. eriostachyum, Imperata cylindrica var. Koenigii, and Oenothera Lamarckiana. These species form a continuum depending upon available soil moistrue. Species diversity, oragnic constituents, standing crops, available P and exchangeable Na contents of soils showed a good relationship with gradients of the water table.
환경구배에 (環境勾配) 따른 식물성 Plankton 의 정규분포반응에 (正規分布反應) 관한 연구
장남기,진창덕 ( Nam Kee Chang,Chang Deog Jin ) 한국하천호수학회 1977 생태와 환경 Vol.10 No.3·4
Characteristics of normal curve were studied as a basis of the growth rate for interpreting the response of phytoplankton on environmental gradients. The relationship between the growth rate and the environmental gradients is described as (수식) where w`, m, Wm, X, μ, and δ are the growth rate, the sort of environmental factors, the maximum growth rate, the values of environmental gradients, the mean value of environmental gradients and the standard deviation, respectively. The quantative relationships between the growth rate and pH, and nitrogen concentration in a batch culture of Chlorella vulgaris were, respectively, (수식) and (수식)
섬바디의 물질생산력 광합성 및 하고현상에 관한 생리생태학적연구
장남기,조기연 ( Nam Kee Chang,Ki Yeon Cho ) 한국축산학회 1977 한국축산학회지 Vol.19 No.6
This study was performed to find the effects of environmental factors on the seasonal changes of the matter production and of Dystaenia takesimana population in Seoul area in 1975. The peak value of standing crops of above-ground parts was 1,428.5 D.M. g/㎡ on October 27. The maximum productivity of above-ground parts was 55.21 D.M. g/㎡/day on July 38 to August 4 and that of under-ground parts was 26.72 D.M. g/㎡/day on July 18 to 28. The low productivities of above-ground parts were -17.47 D.M. g/㎡/day late in June and -48.42 D.M. g/㎡/day early and late in August. And those of under-ground parts were -31.9 D.M. g/㎡/day early in August and -14.5 D.M. g/㎡/day late in August. The range of optimum temperature of photosynthetic activity was from 17℃ to 19℃. The threshold of photosynthetic activity under the condition of relative maximum water holding capacity of 75% was 55㎎/dm²/hr. Summer decline phenomena of the matter production eras due to the high temperature and drought. This phenomena for Dystaenia takesimana was evidiently shown late in June and early sin August.
장남기,임문교,윤익석 ( Nam Kee Chang,Moon Kyo Lim,Ik Suk Yun ) 한국축산학회 1976 한국축산학회지 Vol.18 No.3
For the assessment of the gross metabolism in a grassland of Miscanthus sinensis in Maseoguri area, the assimilation and dissimilation of carbon in this grassland were investigated. T he results obtained in this study can be summarized as follows: 1. The photosynthetic rate at 300 ppm CO₂ and 30℃ was saturated with a light of about 50 klux in the field. 2. The photosynthetic rate at 50 klux and 30℃ was not saturated with a CO₂ concentration is the atmosphere. 3. The optimal temperature for photosynthesis was found to be approximately 35℃. 4. The leaves of Miscanthus sinensis which were located at the 5th and 6th nodes showed the maximum photosynthetic rates. 5. The peak productivity of the above-ground parts was 30.66g/㎡/day from July to August and that of the under-ground parts was 3.76g/㎡/day from August to September. 6. The time periods required for decomposition of 50%, 95% and 99% of initial organic carbon in the litter were 0.9, 4.0 and 6.7 years, respectively.
진화 개념구조가 반영된 중학교 생물프로그램이 학생의 생명관에 미치는 효과
권혜련(Hye Ryun Kwon),김정석(Jung Seok Kim),장남기(Nam Kee Chang) 한국과학교육학회 2001 한국과학교육학회지 Vol.21 No.2
This study was designed to test the hypothesis that the biological conceptual structure reflected in secondary textbooks influence students` views of living things and based on that supposition to evaluate the effects of evolution oriented biology program on their viewpoints. The evolution oriented biology program has been developed with understanding biological phenomena through narrative explanation of singular events of major importance for the history of life. On the other hand the traditional program is to understand biological phenomena through explanation of structures and functions of living things. It was supposed that the evolution oriented biology program is more effective when it is instructed according to historical sequence. The agreement on evolutionary properties of living things were increased significantly by the evolution oriented biology program conducted according to historical sequence. But the agreement on origin and nature of living things was not changed. The biological achievement was not different among groups of each different program.
장남기 (Nam Kee Chang) 한국식물학회 1968 Journal of Plant Biology Vol.11 No.3
Determination of the pH value and analyses of the available phosphorus of some soils under the forest and grassland Kwang-nung have been examined to study the relationship between the soil pH and available phosphorus. The results might be summarized as follows: 1) The available phosphorus decrease steadily as the pH goes up to 5.2. However, at the pH 5.2∼6.3, it shows an increase and decreases again as the rise above pH 6.3. 2) There is a significant difference in the amounts of the soil phosphate among the areas sampled. 3) The statistical analysis of the data obtained shows that soil phosphate is limiting factor governing the distribution of natural vegetal pattern.
금속광체상에 (金屬鑛體上) 나타나는 식물에 관한 생리생태학적 연구 - 1. 아연광지대의 지표종과 식생
장남기(Nam Kee Chang),목창수(Chang Soo Mok) 한국식물학회 1977 Journal of Plant Biology Vol.20 No.1
During the period of 1975-76, a survey was carried out to find out zinc indicators in the natural vegetation in Korea. The symptoms of chlorosis were observed in flowering plants in the areas of zinc outcrop of Wolgok-A, Seokgok-9, and Sowolgok. Although 28 species were found to be chlorotic, the total quantity of chlorotic foliage observed was small. Reasons for chlorosis in the areas of zinc ore deposits is considered as effects of zinc, lead, copper and calcium ions. Sedum sp. and Dianthus sinensis were confined to soil containing more than exchangeable zinc of 30 ppm and to accumulation in the plants contained at least 1,300-14,000 ppm of zinc. Therefore Sedum sp. and Dianthus sinensis might be used as zinc indicators in Korea.
벼 유식물 뿌리에서 질산환원효소의 (窒酸還元酵素) 활성과 질산염의 흡수
장남기(Nam Kee Chang),정구흥(Gu Hung Jung) 한국식물학회 1981 Journal of Plant Biology Vol.24 No.3
The nitrate reductase activity (NRA) and nitrate uptake were studied in roots of rice seedling (Oryza sativa L. IR-667). The exponentially increasing curves of NRA and nitrate uptake suggested an induction by the external nitrate. NRA and nitrate, uptake were, repressed in phosphate buffer solution (pH7.0). The in vivo NRA with NO^-_3 was increased under the presence of ammonium ion but nitrate uptake was inhibited. As compared with the roots of intact rice, the excised roots generally showed low values of in vivo NRA. Seedlings taking up nitrate for 17 hr had a storage pool which supplied nitrate to nitrate reduction site.
장남기(Nam Kee Chang),윤익석(Ik Suk Tun),김병태(Byeong Tai Kim) 한국식물학회 1968 Journal of Plant Biology Vol.11 No.4
The vascular flora of grasslands in Mt. Kumhak, Moonheri, Sungilkyo and Kosukjong area located at Chulwon were composed of 54, 57, 45, and 39 species, the most impotant of which were Arundinella hirta and Miscanthus purpurascens. These two species contributed greatly to the standing crop of live material was in excess of 142g/㎡ throughout the growing season. The peak standing crop of 332.4g/㎡ was reached in July under flooded conditions largely as a result of the growth of Miscanthus Purpurascens and Arundinella hirta. The net production of organic matter occurred largely throughout the growing season. The net productivity of the vascular component of community was in excess of 27.3g/㎡ for one growing season.