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송승달 경북대학교 환경과학연구소 2000 環境科學硏究所論文集 Vol.14 No.1
We visited the Sahara and the Great Man-Made River Project in Libya to investigate the desert ecosystem and the adaptation characteristics of arid organisms from November 25 to December 5, 1996. The Sahara is the principal desert area of Africa, occurring approximately between latitudes 17 and 30 and longitudes 10 and 33 E. The precipitation across the area is very sparse and very irregular in time, space, and amount. For convenience the zone within the annual average precipitation 20 mm isohyte is considered as the Sahara, although this isohyte is very poorly defined and the concept of annual precipitation can be misleading for deserts. Moisture within the Sahara is provided by the very intermittent precipitation, dew, and localized groundwater discharge. Apart from the latter, the moisture amounts are extremely small, but together with groundwater contributions, a surprisingly diverse flora and fauna are present locally. The flora of the Sahara, in common with other desert flora, exhibits remarkable capacities to maintain effective water balances under extreme and impersistent drought conditions. The most primitive forms of flora are lichens and algae that occur extensively and depend principally upon rainfall and dew when other moisture sources are not available. Ephemeral plants that have a life cycle restricted only to wet periods also typify the Sahara. Succulent species are Eupfzorbia and Caralluma. The xerophytes are small plant forms that can occur throughout the Sahara in any advantageous microtopographic setting conducive to moisture accumulation. In areas close to incised wadi beds the presence of a higher overall moisture content in the ground is identified by increases in the density of small plants such as Panicum turgidum, Pergularia tomentosa, and Retenma raetam.
송승달,김의수 경북대학교 환경과학연구소 1994 環境科學硏究所論文集 Vol.8 No.1
Atmospheric pollutions of SO2, NOD, 0, etc. resulted in destruction of natural ecosystem by precipitaiton of acidic substances as well as other toxic photochemical interact substances. Aluminum gradients were applied to several plants and animal species to clerify the toxic effects of soluble Al+ion on seed germination, root growth and tissue chemistry. Aluminum concentrations above 10-M resulted in strong inhibition of seed germination and root growth of Raphanus sativus L., Brassica pekinensis L., Perilla frutescens var. ,raponica Hara, Zea mat's L. and Owa saciva L. Root elongation of Allium scorodprasum L. was inhibited 55% at 10-M of Aluminum concentration. Abdominal injection of Aluminum (17g/kg) caused 100% death of Mus musculus L. within 2 hours. The tissue chemical examinations of testis and liver of Mus musculus L. showed significant changes in the Aluminum (1.7g/kg) application, but no difference in the Aluminum (0.17g/kg) application and control plot.
이경진,송승달 경북대학교 환경과학연구소 1994 環境科學硏究所論文集 Vol.8 No.1
The seasonal changes of symbiotic nitrogen-fixation activity and environmental factors of autumn olive (Elaeagnus umbellata Thunb.), which is an important constituent species of temperate vegetation and a non-leguminous root nodule plant interacting with Frankia sp., were quantitatively analyzed in the natural vegetations during the growing period from April through November 1992 and 1993. Site 1'showed wetter condition than Site 2 in soil environments of habitat. The light conditions of Site 1 was partially shade, while Site 2 was sunny area. Soil pH of investigated area was weak acid ranging from 4 to 6.7. The nitrogenase activity showed two peaks in spring (58.6umole-CZH,-gfw-'-hr-') and autumn (47.8~emole-C,J-I,-gfw-'-hr-') but a significant drop in summer and nothing in winter. The plant grown in Site 1 showed higher chlorophyll contents than that in Site 2 and showed seasonal changes in the range of 16^-74 u g chl cm-. The maximum water content in each plant organ was 65.3, 321. 8, 365.3 and 697.7% respectively for stem, root, leaf and nodule. The optimum for nitrogen fixation activity was attained by 30 C, pH 7, 12Kpa of oxygen partial pressure, 2cm of nodule size and root attached conditions in the rhizosphere. The nitrogenase activity treated with salt and nitrogen sources for 30 minutes showed distiguisled decreases and nothing in 0.1 and 1M respectively.
정원우,이우봉 경북대학교 환경과학연구소 2000 環境科學硏究所論文集 Vol.14 No.1
The environmental effect of economic development bring the chemical contaminants in human life. The toxicological of environmental hormons face the feminization of nature. In terms of in this point, our eco-centered ethics have time to change the mind about nature. The middle school program of education with environment should be action oriented program between knowledge and attitude, which means from knowledge to action. The aim of open class education with environment program must consist of structural system model(fact concept generalization), pedagogy(explanation participation) and evaluation(criticism prediction).
주성현,조진화 경북대학교 환경과학연구소 1995 環境科學硏究所論文集 Vol.9 No.1
The purpose of this study is to investigate the ecological response and the c hange of soil properties resulted from the control of environment factors, light int ensity water soil pH and it is to investigate the species and soil in the studie d site in which Phytolacca americana is dominant. The results were summarized as following. 1. Species composition in studied area in which Phytolacca americana is dominant is that tree species layer consist of Robinla pseudo-acacia, shrub layer consist of Quercus serrata, Ulmus davidiana, Ailanthus altissima, and herb layer consist of Erigeron annuus, Mlscanthus sinerJSis var. purpurascens, Spodiopogon cotulifer. Bidens bipinnata, Taraxacum, and so on. 2. When the simulated acid rain treated with different pH levels, pH changes did not showed distinctly. The greatest changes rate were found in the subjects treated with non soil water stress and pH 3.0. Available Phosphorus subjected to treatments had the greatest value in pH 3.0 treatment and non soil water stress. 3. An increasing rates of root weight were the highest in both non water stress and pH 3.0.