자운영의 생육 및 성분에 미치는 지베레린의 영향

차종환 (Jong Whan Cha) 한국식물학회 1962 Journal of Plant Biology Vol.5 No.4

CHA, Jong Whan (Dept. of Biology, College of Education, Seoul National University.) Effect of gibberellin on the growth and internal components of Astragalus sinicus L. Kor. Jour. Bot. V(4) : 1-5, 1962. The effect of GA on the growth as well as on the internal components of the leaves of Astragalus sinicus L. under the soil culture was investigated. The result has indicated that small variation in the relative concentration of GA treated on the leaves shows a marked influence on the internal components of the plants. The increse of growth was associated with increasing intensity of GA. Chlorophyll and carotene contents in the leaves were depressed with increasing concentration of GA. It was noticed that the growth was promoted with the decrease of the contents of chlorophyll and carotene. In contrast the ascorbic acid in the leaves treated with GA decreased in proportion to the degree of the concentration of GA. Carotene content varied with chlorophyll, although the ratio of chlorophyll to carotene was not so high as the results obtained by Beck and Redman^(1). Chlorophyll and ascorbic acid values with respect to growth differed greatly during the two experimental periods. The chlorophyll content was found highly significant in this experiment. As the concentration of GA was increased, it was noticed that there was a reduction of anthocyanin, sucrose, and reducing sugar contents. The anthocyanin content was not so high in this study as in the results obtained from the corn by Jacob Straus^(6).

Na鹽處理에 依한 두 沙漠植物의 體內 陽, 陰이온 關係

車鍾煥(Jong Whan Cha) 한국토양비료학회 1973 한국토양비료학회지 Vol.6 No.3

두 沙漠植物에 미치는 Boron 의 영향

車鍾煥(Jong Whan Cha) 한국토양비료학회 1973 한국토양비료학회지 Vol.6 No.2

환경오염 방지를 위한 식물의 생태학적 연구 (3) - 도로변 식생과 중금속 함량 및 오염에 관한 연구

차종환 (Jong Whan Cha) 한국식물학회 1974 Journal of Plant Biology Vol.17 No.4

Some ecological attributes of perennial plants and Pb contamination were analyzed for study plots near an entrance of Nevada Test Site at Mercury Valley, Nye County, Nevada. The surface of the desert pavement soil was composed of stones(1 to 4㎝ diameter). The underside of each stone was coated with coarse and fine sand(about 90%). The profiles of soil were constituted with the A-horizon and C-horizon only. The soil pH at the plots ranges from 7.6 to 8.5, C/N was 13 and cation exchange capacity showed 15me/100g. Nine species and 42 number of individuals were found in all plots. Franseria dumosa and Larrea divaricata were dominant species. The discrete clumps of vegetation were consisted of 9 species of common perennials and these were covered about 25% on desert pavement, on the other words, bare area without vegetation was about 75%. The size and spacing of the plants was irregular. Community coefficient as comparison between shrub species in these study area and those in near the low elevation desert indicated a low degree of similarity. Density, cover and productivity in the study plots as compared with those in the nearest study areas in Mercury Valley showed a higher value. The soils in the studied area involved high heavy metal elements and heavy metal contents in the plant tissue was higher than those of its soil. The leaves of Lycium andersonii tended to accumulate more Zn and Mo than those of the other species. Larrea divaricata leaves accumulated very high levels of Fe and Ephedra nevadensis were generally high in Mn. Lead contamination was apparent in foliage of desert vegetation collected along-side the roadway, reflecting the variation in traffic volume. Lead contents greater than fifteen-fold of normal(low traffic) were found in plant foliage along-side the heavily traveled roadway. Lead content of old foliage by the heavily traveled roadway was as much as 129 ppm but that of new foliage 17 ppm only.

제주도 식물군락의 생태학적 연구 - 비자림 (榧子林) 및 문주란 자생지를 중심으로

차종환 (Jong Whan Cha) 한국식물학회 1970 Journal of Plant Biology Vol.13 No.1

This investigation was one of the series of ecological studies on the plant communities of Quelpart Island which was held in 1969. It was aimed at studying the ground vegetation of Torreya nucifera and the soil properties of the ground in which it grows. Observation of the flora in a place where wild growth of Crinum maritimum, soil properties and distribution of micro-organisms in a place where wild growth occurs, were also made. 1) A few kinds which have important values among the ground vegetation of Torreya nucifera forest are Liniope graminifolia, Convallaria keiskei, Sasa quelpaertensis, Carex kingiana, Pteridium aquilinum, Pyrola japonica, Hedera tobleri, etc. 2) While the studies of 25 Quadrats were being held, 29 species in A plot, 30 species in B plot, and 26 species in C plot have been found. 3) The kind which has the highest important valus among the species located in naked plot (outside of Torreya nucifera forest) is Zoysia japonica and 18 other kinds were found. 4) The soil fertility through all depths are found higher in the forest soil than in that of open places. 5) P_2O_5, K, and total exchangeable bases etc. have shown the difference of contents according to the depth and generally had lower value as much as it goes down. 6) The content of N was a lot higher than any other forest soil and P_2O_5, K and total exchangeable bases seemed to be a little lower. 7) The overall flora of Todo consists of 71 specics (9 species of wood plant and 62 species of herbs) added 27 kinds of non-reported species. 8) The mineral contents are the highest at a place of wind growth of Crinum maritimum which has much organic matter. The subsoil of this place is more fertile than surface soil. 9) The soil of Todo which is sandy soil, consists of shellfish shell and quartz, and has low fertility and alkali. 10) In the total occurrences of micro-organisms, bacteria was the greatest in number followed by actinomycete and fungi, in that order. 11) A survey of the soil depth and the ecological distributional pattern of microorganisms revealed that the number of micro-organisms is the greatest on the surface, gradually decreasing in proportion to the depth. 12) It was found that a comparatively greater number of micro-organisms occurred when the soil showed an adequate increase in water content.

가변 유닛셀의 조립형 디자인을 기반으로 한 온도 감응형 열메타물질

차종환(Jonghwan Cha),강성구(Sunggu Kang),서경범(Kyungbeom Seo),이호원(Howon Lee),최원준(Wonjoon Choi) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.5

傾斜地 葡萄園에 關한 硏究(Ⅱ)

車鍾煥(Cha Jong Whan),金鼎濟(Kim Jung Jai),정현식(Chung Hyun Shick) 한국원예학회 1970 Horticulture, Environment, and Biotechnology Vol.8 No.-

재배식물의 생육 및 성분에 미치는 지베레린의 영향

차종환 (Jong Whan Cha) 한국식물학회 1962 Journal of Plant Biology Vol.5 No.3

CHA, Jong Whan (Dept. of Biology, Coll. of Education, Seoul National Univ.) Effect of Gibberelline on the growth and internal components of selected vegetable plants. Kor. Jour. Bot. V(3):11-20, 1962. The effect of GA on the growth as well as on the internal components of the leaves of ordinary vegetable plants under the soil culture was investigated. A relatively small difference in GA concentration applied showed a marked influence on the growth and constituents of the plants observed. The increase of growth was related to a highly significaat digree with the intensity of GA. Chlorophyll and carotene content in the leaves were significantly with increasing concentration of GA, except for some plants. The growth in all examined plants did not correspond to the contents of chlorophyll and carotene. In contrast the ascorbic acid in the leaves treated with GA detreased in proportion to the GA concentrations. Chlorophyll and ascorbic acid values differed greatly during the two experiments and the difference was proved significant. Carotene content varied with chlorophyll although the ratio of chlorophyll to carotene was not so high as that obtained by Beck and Redman^(3))

각종임토에 관한 화학성분의 비교

차종환 (Jong Whan Cha) 한국식물학회 1963 Journal of Plant Biology Vol.6 No.3

CHA, Jong Whan (Coll. of Education, Seoul National Univ.) A comparison of chemical properties of some forest soils. Kor. Jour. Bot. VI (3):1-5, 1963. Determination of the chemical properties in some forest soils and the naked soil developed on granite in the mountains of the vicinity of Seoul, Korea are presented in this study. The soil under the broad leaved forests has a higher nutrient indicated by available nitrogen, nitrate nitrogen, and phosphorus contents, compared with that under the needle leaved forests. On the contrary the [content of organic matter and base exchange capacity in the needle forest soils is higher than in the broad leaved forest soils. The significant difference between two horizons of each soil appeared only to be in the content of the available phosphorus, and that of [the needle and the broad leaved forest soils, and the naked soils was the nitrate nitrogen and organic matter content among the several chemical properties.

토양 및 재배식물에 미치는 연탄회의 영향

차종환 (Jong Whan Cha) 한국식물학회 1964 Journal of Plant Biology Vol.7 No.1

Cha, Jong Whan (Dept. of Biology, Graduate School, dong Univ.) The influences of briquette ashes on the chemical properties of soils and the growth of sepected vegetable plants. Kor. Jour. Bot. Ⅶ(1):5-10, 1964. The effects of briquette ashes on the growth of vegetable(cabbge, lettue, spinach and radish) and their fresh weight under the culture of the soil mixed with the briquette ashes, and on the chemical properties of the soil were investigated. The growth rate of these plants and chemical properties of the soil has shown some influence due to different concentration of briquette ashes added to the soil. The increase of growth in cabbage and lettuce was remarkably found by the plot treated with 1/50 concentration of briquette ashes. The fresh weight of vegetable plants was increased with high concentration of briquette ashes, but if the concentration of briquette ashes was too high, it was rather depressed. Chemical properties in the soil after cultivation of the plants were more depressed than before cultivation. In contrast the available nitrogen content in the soil after cultivation was more increased than before cultivation of the plants. The reduction of available nitrogen and nitrogen was associated with the increasing intensity of briquette ashes, but available phosphorus content was increased with high concentration of briquette ashes, though its content was not so high as the results obtained by Han (8). The values of total exchangeable base and pH in the soils treated with briquette ashes were increased with a high degree of the concentration of ashes. The value of pH was not significant, and pH value of lime plots was higher than that of briquette ashes. The average value of the water content did not show any difference, and the difference of the content of organic matter in the soil in which different vegetables grew into the plots reached to the significance of a 5% level.