• Title/Summary/Keyword: Mountainous regions

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Cultural and Rainfall Factors Involved in Disease Development of Fusarium Wilt of Sweet Potato

  • Lee, Yong-Hwan;Cha, Kwang-Hong;Lee, Doo-Goo;Shim, Hyeong-Kwon;Ko, Sug-Ju;Park, In-Jin;Yang, Kwang-Yeol
    • The Plant Pathology Journal
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    • v.20 no.2
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    • pp.92-96
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    • 2004
  • Environmental factors such as soil moisture, land management, and weather conditions affecting Fusarium wilt of sweet potato were investigated in major sweet potato cultivation regions in Korea. Fusarium wilt occurred mainly in reclaimed terracing lands, which are flattened and located in hilly to mountainous areas at the base of the mountain, in early seasonal cultivation regions. Disease severity was lower in reclaimed fields with natural slope. The development of Fusarium wilt in the fields was highly correlated with precipitation during planting period (r=-0.96**). Fusarium wilt was more severe in fields with less than 20 cm of available soil depth than in fields with over 20 cm of available soil depth. Greenhouse studies were consistent with field studies that less soil moisture content caused severe Fusarium wilt of sweet potato. These results indicate that low rainfall and moisture of soil with low effective soil depth during planting period are important environmental factors influencing the development of Fusarium wilt.

The Assessment of Landslide Hazards in Gyeonggi Icheon area using GIS-based SINMAP Model Analysis (GIS기반의 SINMAP을 통한 경기도 이천지역의 산사태 위험도 분석)

  • Kwon, Ki-Bum;Lee, Hee-Chul;Chun, Jin-Soo
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.09a
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    • pp.782-789
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    • 2010
  • Landslides cause enormous economic losses and casualties. Korea has mountainous regions and heavy slopes in most parts of the land and has consistently built new roads and large-scale housing complexes according to its industrial and urban growth. As a result, the damage from landslides becomes greater every year. In this study, performed a GIS-based landslide hazard analysis by SINMAP(Stability Index MAPping) model in Gyeonggi Icheon area coupling with geomorphological and geological data. SINMAP model has its theoretical basis in the infinite plane slope stability model with wetness obtained from a topographically based steady state model of hydrology. To Gyeonggi Icheon area landslides hazards evaluated, these SINMAP model were analysed results while simultaneously referring to the stability index map, where lines distinguish the zones categorized into the different stability classes and a table giving summary statistics.

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A Study on the Improvement of Living Environment and Land Utilization - With an Emphasis on the Policies of less Favoured Areas and Environmentally Friendly Agriculture - (농산촌 정주환경 조성과 국토 활용 제고에 관한 연구 - 조건불리지역과 환경친화적 농업에 대한 지원정책을 중심으로 -)

  • 윤여창;유순호
    • Journal of Korean Society of Rural Planning
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    • v.1 no.2
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    • pp.103-121
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    • 1995
  • This study was carried out to identify the problems and policy alternatives for the improvement of living conditions and environmentally friendly agriculture. The results of surveys on the current situations of living conditions in the rural areas revealed that the main cause of depopulation in Korean rural villages was the lack of social infrastructure and income sources. The current government policies for agriculture geared mainly for improvement of international comparative competitiveness will result in the further disadvantage against the mountainous regions with marginal agricultural lands. Therefore, it is recommended that the agricultural policy should be complemented by the environmental and social policies in the less favoured areas. This can be justified by the fact that the demand for environmental public goods such as recreational opportunities in rural settings uncontaminated by the industrial wastes is growing.

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Evaluation of Raingauge Networks in the Soyanggang Dam River Basin (소양강댐 유역의 강우관측망 적정성 평가)

  • Kim, Jae-Bok;Bae, Young-Dae;Park, Bong-Jin;Kim, Jae-Han
    • Proceedings of the Korea Water Resources Association Conference
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    • 2007.05a
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    • pp.178-182
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    • 2007
  • In this study, we evaluated current raingauge network of Soyanggang dam region applying spatial-correlation analysis and Entropy theory to recommend an optimized raingauge network. In the process of analysis, correlation distance of raingauge stations is estimated and evaluated via spatial-correlation method and entropy method. From this correlation distances, respective influencing radii of each dataset and each methods is assessed. The result of correlation and entropy analysis has estimated correlation distance of 25.546km and influence radius of 7.206km, deducing a decrease of network density from $224.53km^2$ to $122.47km^2$ which satisfy the recommended minimum densities of $250km^2$ in mountainous regions(WMO, 1994) and an increase of basin coverage from 59.3% to 86.8%. As for the elevation analysis the relative evaluation ratio increased from 0.59(current) to 0.92(optimized) resulting an obvious improvement.

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A Study on the Utilization of Irrigation Systems for Greenhouse Farming (시설농업을 위한 관개시설의 이용실태 조사분석)

  • Lee, Nam-Ho;Hwang, Han-Cheol;Nam, Sang-Woon;Hong, Seong-Gu;Jeon, Woo-Jeong
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.40 no.6
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    • pp.37-45
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    • 1998
  • A survey was conducted to get information on the utilization of irrigation systems for greenhoyses farming. Three regions were selected which represent geographical chatacteristics such as neighboring urban area, flat-field area, and mountainous area. The number of greenhouses farms interviewed was 432 in total. The contents of the survey consisted of general characteristics of greenhouse farmers, the size and location of greenhouses, cultuvated crops, irrigation method, irrigation scheduling, and irrigation automation. The analysis of the surveyed data showed that greenhouse farmers did not take technical assistances. Proper criteria or guidelines for selection and operation of irrigation systems were not available. Irrigation systems were operated by hand. Irrigation scheduling were executed by farmer's experience. Maintenance of irrigation systems in general were poor. Development of economically reasonable irrigation system is of importance.

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Geospatial Technologies for Landslide Inventory: Application and Analysis to Earthquake-Triggered Landslide of Sindhupalchowk, Nepal

  • Acharya, Tri Dev;Yang, In Tae;Lee, Dong Ha
    • Journal of Korean Society for Geospatial Information Science
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    • v.24 no.2
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    • pp.95-106
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    • 2016
  • Landslide is one of the natural hazards, triggered by rainfall or earthquake and it leads to damage and loss of properties and lives especially in hilly and mountainous regions. Inventory maps of the area is of much importance in order to understand the landslide phenomena in detail, conduct further studies on landslide, prepare susceptibility map and minimize risk. Inventory maps of landslides can be constructed by several methods, using multiple images through visual interpretation, using algorithms in multi-spectral or SAR images or verification from field investigation. The possible methods were explored for Sindhupalchowk district of Nepal, which was struck by massive earthquake on 2015 and landslide inventory was prepared. The inventory was analyzed for its frequency over elevation, slope aspect and dominant soil classes and also the information value for their occurrence probability.

Fundamental Study on the Items of Check and Evaluation at the Rockfall-worried Railroad Sites (선로연변 낙석우려개소 점검 및 평가항목에 대한 기초연구)

  • 박영곤;김현기;김경태;신민호
    • Proceedings of the KSR Conference
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    • 2001.05a
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    • pp.431-436
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    • 2001
  • Rockfall has long been a serious problem, especially derailment of train running on the track in mountainous regions. The purpose of this study is to suggest the reasonable items of check and evaluation to railroad rock slopes for safe maintenance and management of rockfall-worried railroad sites. Therefore, main and sub items were extracted from the survey of foreign and other authorities' cases and evaluation table (temporary) composed of items classified by important degree was suggested. To evaluate the availability and reasonability of items, statistical analysis based on field investigation namely SMR(Slope Mass Rating) and explanation values was carried.

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A Study on tHe Utilization of Irrigation Water for Greenhouse Farming (시설농업의 용수 이용실태 조사분석)

  • 이남호;황한철
    • Journal of Korean Society of Rural Planning
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    • v.4 no.2
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    • pp.96-102
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    • 1998
  • A field survey with interview was conducted to get information on the irrigation water usage for greenhouse farming. Three study regions were selected which represent geographical characteristics such as ,neighboring urban area, flat-field area, and mountainous area. Several items were investigated and analysed such as location of greenhouse, type of irrigation water resources, type of irrigation method used, way to decide intake facility size, farmers'satisfaction on intake facilities performance and water quality, and needs for water quality test. It was found that greenhouse farmers did not take an advantage of technical assistances. Proper criteria or guidelines for selection and operation of water intake facilities were not available.

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Application of GPS Surveying for Extracting Highway's Horizontal Alignment

  • Seo, Jeong-Hoon;Roh, Tae-Ho;Lee, Jong-Chool
    • Korean Journal of Geomatics
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    • v.2 no.1
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    • pp.1-6
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    • 2002
  • Korea is a small country with relatively large mountainous areas and has many difficulties from planning to completing one road. Maintaining a completed road presents even more difficulties. presently, in estimating design elements, the result varies according to the engineer and there are many cases that question the reliability of the results. Therefore, in this study, the alignment of highway was sampled using by the centerline path, the design elements of horizontal alignment were reduced by applying the Least Squares Method, and the accuracy was analyzed. By this method, IP, IA, R, $\Delta$R and A-parameter were also determined. By observing relatively long straight sections, the approximate values could be estimated, and particularly, the considerably accurate value of A-parameter was determined. This study, using the Least Squares Method, aims to contribute to the development of the alignment examination in frequent traffic accident regions.

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The complete chloroplast genome sequence of Rhododendron caucasicum (Ericaceae)

  • Myounghai KWAK;Rainer W. BUSSMANN
    • Korean Journal of Plant Taxonomy
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    • v.53 no.3
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    • pp.230-236
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    • 2023
  • Rhododendron caucasicum Pall. is a shrub distributed in the mountainous areas of the Caucasus from northeastern Türkiye towards the Caspian Sea. This study reports the first complete chloroplast genome sequence of R. caucasicum. The plastome is 199,487 base pairs (bp) long and exhibits a typical quadripartite structure comprising a large single-copy region of 107,645 bp, a small single-copy region of 2,598 bp, and a pair of identical inverted repeat regions of 44,622 bp each. It contains 143 genes, comprising 93 protein-coding genes, 42 tRNA genes, and eight rRNA genes. The large chloroplast genome size is likely due to the expansion of inverted repeats. A phylogenetic analysis of chloroplast genomes with other Rhododendron species supports previously recognized infrageneric relationship.