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.

두 沙漠植物에 미치는 Boron 의 영향

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

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))

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).

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.

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.

건우기에 (乾雨期) 산림토양의 (山林土壤) 화학성분의 변화

차종환 (Jong Whan Cha) 한국식물학회 1964 Journal of Plant Biology Vol.7 No.2

Cha. Jong Whan (Dept. of Biology, Graduate School, Dong Kuk Univ.) The changes of chemical properties of forest soils in dry wet seasons. Kor. Jour. Bot. Ⅶ(2): 1-8, 1964. Soil selected for the present investigation was collected from a mountain of the Forestry Experiment Station of the vicinity of Seoul. The forest communities studied were three forest and a unplanted soils. The soil samplets were obtained from each forest type during dry and wet seasons. And these samples were collected from four horizons of all communities respective1y. It was showed that exchangeable hydrogen was increased by rainfall, and total exchangeable base decreased in the same way. The content of nitrogen is washed away by rainfall, especially ammonium nitrogen was highly significant between dry and wet season. On the contrary, organic matter and available phosphorus were of no significant difference between dry and wet seasons. The values of pH appeared a different response in dry and wet seasons according to the plant communities. The needle-leaved forest soils showed more acidity than the broad-leaved forest soils, and the least acidity in open places. All nutrients in soil studied gradually decreased down the profiles. According to statistical analyses of the soil components among all soil horizons, total exchangeable bases in wet season indicated only significant at 1%. Exchangeable hydrogen and organic matter of the soil in dry season was particularly very low with increased depth in the profile. The fertility level of most forested soils selected for the present investigation is low according to chemical tests for available nutrient elements.

각종지질의 임지에 (林地) 함유된 토양성분

차종환 (Jong Whan Cha) 한국식물학회 1964 Journal of Plant Biology Vol.7 No.3

CHA, Jong Whan(Graduate School, Dong Kook University) The Soil properties of woodland having different geological origins. Kor. Jour. Bot. Ⅶ (3):15-21, 1964. In this experiment, the chemical compenents of the soils were collected from different horizons in some forest soils and naked soils developed on granite, crystalline schist, and granite gneiss were ana1ized to be compared with each other. The developed degree of the surface soils showed some difference according to the different geological formation. The soil derived from granite gneiss was showed to have more water content, available nitrogen, exchange properties and weathered most. Much quantity of the organic matter, and of the available phosphorus was discovered in the soil derived from granite and found closely related to each other. The soil derived from the parent rock of granite showed highest acidity. The soil derived on crystalline schist was found to have the maximum quantity of the nitrate nitrogen and the least of the exchange properties. The only significant difference among the chemical properties of the three parent rock seems to be in the contents of the available phosphorus, nitrogen, water content, and organic matter in the Pinetum densiflorae, of the nitrogen, exchange properties, and pH in the Alnusetum japonicae, of the available phosphorus, nitrogen, total exchangeable base, and base saturation in the naked area, and of the nitrogen, base exhange capacity, and pH in all forest soils. The degree of the distribution of the nutrient in soil was found decreasing going from the surface soil down to the subsoil.

한국산 야생식용식물의 성분조사 (1) - 야생식물의 Vitamin C , Chlorophyll , 및 Carotene 함량조사

차종환 (Jong Whan Cha) 한국식물학회 1964 Journal of Plant Biology Vol.7 No.4

CHA, Jong Whan (Graduate School, Dong Kook University) A Study on certain chemical components of edible plants in Korea I. a study on Vitamin C, chlorophyll. and carotene contents of wild plants in Korea. Kor. Jour. Bot. Ⅶ (4): 1-8. 1964. This experiment was investigated from March 20 to September 20, 1960. It was investigated chlorophyll. carotene and ascorbic acid contents of edible plants in Korea, 64 with 132 species belonging to 62 families for the ascorbic acid and 116 species on the 64 families for the chlorophyll and carotene content. Carotene content varies with chlorophyll although the ratio of chlorophyll to carotene was not so high as that obtained by Beck and Redman (1). Where the chlorophyll content is abundant, it appears that the amounts of carotene and asrorbic acid are also pleny.

토양조건에 (土壤條件) 미치는 낙엽의 영향 (제2보) - 낙엽부패에 의한 토양성분 변화

차종환(Jong Whan Cha),장남기(Nam Kee Chang),임영득(Young Duek Rim) 한국식물학회 1969 Journal of Plant Biology Vol.12 No.1

In this experiment the litters of each five species of neadle-leaf trees and broad-leaf trees were laid on each pot soils, which had same soil conditions, is the green house and the soil fertility of each pots were determined after four years. Chemical properties among each pot soils under litters of needle-leaf trees showed remarkable different values in the pH, base exchange capacity, total exchangeable base, base saturation, organic matter, available phosphorus, exchangeable potassium and calcuim, and that of broad-leaf trees showed respectively significant difference. The content of chemical compenents, such as total exchangeable base, organic matter, total nitrogen, available phosphorus and exchangeable potassium, between pot soils under litters of the needle-leaf trees and the broad-leaf trees were significant at the 0.01 and 0.05 levels of the statistical probability. The fertility of soil under the influence of decayed fallen leaves is the highest value in the pots of broad-leaves and next to the pots of needle-leaves and the control pots the lowest. The pH value of the soil with various kinds of fallen leaves showed little difference among themselves, but it especially approached in the broad leaves plots gradually to neutral and the non-treated plot showed acidity. Lsepedeza bicolar and Castanea crenata are supposed to contribute to the fertility of soil. Pinus rigida showed excellent exchanged properties of soil. The leaves of Robinia paseudoacacia and Pinus koraiensis did not contribute much to the promotion of fertility of soil.