Since a long time ago, people have constructed many reservoirs across the country to secure agricultural water as paddy farming-oriented agricultural culture developed. A reservoir was the only means of stably securing agricultural water because land ... Since a long time ago, people have constructed many reservoirs across the country to secure agricultural water as paddy farming-oriented agricultural culture developed. A reservoir was the only means of stably securing agricultural water because land capacity to retain water is low due to fast outflow, especially in case of Korea where about 70% of the national territory is covered with mountain areas, together with comparatively rough topography. The number of dams and reservoirs which are scattered around the country is 17,596 as of 2012, among which a fill dam accounts for 99%. In case of a fill dam, most of the dam body is made of natural materials, such as earth, gravels, and rock blocks, etc., and the fill dam is also divided into an earth dam and a rock fill dam, etc. according to component materials of a dam body. The downstream slope of a dam body, excluding a rock fill dam, has been constructed generally with the materials of semi-permeability, or permeability, so the slope is liable to be eroded by rain water because of poor fine-grained soil, or clay flour. Therefore, in case of the downstream slope of an earth dam, it’s necessary to install the required protection to prevent it from being eroded and damaged by precipitation, freezing injury and others, and to do sod-pitching work(lined sod, block-sod), and to sow seeds, etc. in the light of weather conditions suited for protection work(Ministry of Agriculture and Forestry, 2002). The plant habitat is determined by natural habitats, such as solar luminosity, soil moisture condition, locational condition, and climatic condition, etc. However, the turf, which was indiscriminately planted only for slope stabilization after constructing a reservoir according to standard specification without regard to ecological environment, was found to slowly change into the native grassland in line with neighboring natural vegetation, and later it made a transition to a plant community entirely different from good quality grassland, and actually became non-existent on the slope, showing an appearance of natural succession to regional dominant vegetation(Glavac, 1996). As for the evaluation standard of the vegetation state of a reservoir slope, this study decided the evaluation type by local defects specified in ‘Agricultural Production Infrastructure Precision Safety Diagnosis Business Detail Sub-procedures’ by the Korea Rural Community Corporation, and also decided evaluation scores and influence coefficient by dividing the evaluation contents into the best condition free of vegetation, a condition where there exists an annual plant on the slope, a condition where there exists a perennial plant on the slope, a condition where there exists shrub class on the slope , and a condition where there exist a perennial plant and shrub class on the slope. The researches on the vegetation on a reservoir slope is almost non-existent, whereas the researches on grassland, whose vegetation conditions are similar to those of a reservoir slope, have been carried out in comparatively many areas. Park, Keun-je and Spatz(1986) presented that there are many sorts of growing environmental conditions of grassland, among which the rapid change of soil moisture, such as surface water, or underground water, etc. is a major factor in changing a plant community. Also, Park, Keun-je and Spatz(2004) tested the similarity between different grassland plant communities according to the environmental condition of grassland (climate, soil, management method, etc.). An environment indicator organism is the one (mostly microbes, or plants) which is used as a scale of measuring an environmental condition of a specific region, and it is applied as a species which makes it possible to know the environmental condition, or a pollution level of the region; therefore, there might be in need of engineering technique development which takes account of the characteristic that the habitat characteristic of a plant appears differently according to natural inhabiting environment. The Korea Rural Community Corporation presented a plan for grasping a humidity-saturated condition of a dam body by confirming autogeny of wetland plants, such as reed, joint grass, butterbur, and Sphaerocarpus, etc., or existence or non-existence of an earthworm, or mole’s earth mound, but actually, this plan is deficient in engineering, objective judgment. This study is a basic research with the aim of developing the method of judging the leakage zone by grasping the habitat characteristic of surface marsh plant species, which inhabit the slope of a reservoir, in the light of the characteristic that inhabiting characteristics appear differently according to natural inhabiting environment. To this end, this study is intending to investigate slope vegetation using a quadrat technique at Sinheung reservoir located at Gwangsi-myeon, Yesan-gun, Chungnam, and to perform the analysis of importance value using relative frequency and relative coverage, etc. Also, this study intended to present the necessity of having to consider the eco-system of the relevant region in time of a reservoir slope afforestation for the time to come by suggesting that the reservoir slope vegetation after a stable period becomes similar to the regional vegetation by comparing this study result with the existing research which carried out the analysis of importance value of forest vegetation for Yesan Region. The major research results are as follows: 1. The total number of plant species appearing at 50 quadrats of the Sinheung reservoir slope was found to be 589, and this study couldn’t discover the turf planted on the slope at the time of reservoir completion in 1997. As a result of investigating the quadrat at Sinheung reservoir, it was found that 6~17 species per quadrat appeared. The representative dominant species by investigated quadrat were found to appear comparatively diversely including kudzu vine, indigo plant, joint grass, Runner reed, mugwort, clover, Shrubby sophora, sod, Daisy Fleabane, Sparganiil Rhizoma, rush, Flame grass, thick-stemmed bamboo while reflecting a seasonal appearance and a positional characteristic. 2. The number of appearances of major plant species was found to be 48 for joint grass , 46 for mugwort, 37 for Chinese yam, 36 for Daisy Fleabane, 31 for kudzu vine, 24 for wild soybean, 24 for Flame grass, 20 for Spiderwort, and 17 for Runner reed. The quadrat where water leak surface species including a rush, Eastern marsh fern, and Creeping rose-gold pussy willow appeared was found to be 7 spots, 9 spots and 4 sports respectively, and appearance frequence was found to be 14%, 18% and 5% respectively. 3. This study calculated the importance value blending relative frequency and relative coverage as shown in <Table 5> in a bid to grasp the ecological influence of plant species forming Sinheung reservoir. As for the overall importance value ratio of the composition species of Sinheung reservoir. joint grass was found to be 13.64% marking the highest, followed by kudzu vine (12.38%), mugwort(11.43%), Runner reed(5.48%), Daisy Fleabane(5.18%), Chinese yam(4.77%), and Flame grass(4.38%). 4. As a result of comparing the above importance value ratio with the existing research which investigated the importance value of natural vegetation at the forest in Yesan-gun, the natural vegetation at the forest was found to show a characteristic similar to the slope vegetation at the reservoir, except for dominant species-Fagaceae coppice, etc. To be concrete, the natural vegetation at the forest was found to show a characteristic similar to that of the birthplace of a forest fire while showing a trend contrary to an artificial forest, or a valley forest. Such an aspect is judged to be attributable to the fact that growth & development of forest trees and perennial plants, etc. are restricted as brush-cutting work has been done on the reservoir slope more than once a year, and reservoir slope vegetation is set as an evaluation standard in precision safety diagnosis. The reservoir slope vegetation is similar to the indicator species which appear in the regional forest vegetation, so there was a need to select afforestation species in the light of this in time of slope afforestation. As a result of the analysis of the importance value, this study grasped that there was an emergence characteristic similar to the vegetation at a birthplace of a forest fires because growth and development of forest trees, and perennial plants were restricted by annually implemented brush-cutting work, etc.; however, indigo plant and bush clover , etc. were found to show the characteristic differing from this. Consequently, this study was able to confirm that there is the necessity of having to create the Importance Value Table suited for reservoir slopes by region through a lot more data construction in the near future. ，韩语论文，韩语论文题目 |
