• Proceedings of the Korean Society for Rock Mechanics Conference
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• 1995.03a
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• pp.135-148
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• 1995

지하수의 부존특성을 결정해주는 주 요인으로는 강수량, 증발량, 유출량, 지형, 수계, 토양, 식생 그리고 토지이용 등 여러 가지가 있으나, 무엇보다도 중요한 요인은 지하수를 저류시킬 수 있는 분포암석의 종류와 그 암석의 수문지질학적 특성이다. 우리나라는 퇴적암으로부터 화산암에 이르기까지 퍽 다양한 종류의 암석이 전국토를 형성하고 있어 지하수의 부존특성도 이러한 분포암석에 따라 특징지어진다. (중략)

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2004.04a
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• pp.177-180
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• 2004

계면활성제를 이용한 오염된 토양을 복원하는데 있어 계면활성제의 회수하는 방법의 하나로 한외여과 방식의 타당성을 검토하였다. 계면활성제의 종류, 전해질과 첨가제로서의 알코올 및 휴믹 물질과 점토질에 의한 상대 플럭스의 변화와 투과액의 계면활성제의 농도 변화를 살펴보았다. 계면활성제의 경우 임계미셀농도 낮을수록 투과액의 농도가 낮았으며, 기타 첨가물은 농도에 비례하여 상대 플럭스가 감소하는 경향을 보였다.

• Journal of Korean Society of Forest Science
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• v.107 no.1
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• pp.50-58
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• 2018

The purpose of this study was to investigate the effects of Aruncus dioicus on annual soil erosion reduction effect. Based on the measured soil erosion data, the cover factor of RUSLE was calculated. Comparing calculated the cover factor and Chewings fescue cover factor for soil erosion reduction, It found that cover crop Aruncus dioicus of reducing soil erosion was effective. The amount of soil erosion according to the type of Aruncus dioicus covering was 2.22 Mg/ha, Chewings fescue was 1.85 Mg/ha, 10.60 Mg/ha was produced in the Bare ground. Cover factor of Aruncus dioicus was $0.09{\pm}0.03$ according to the type of covering, Chewings fescue was $0.08{\pm}0.03$, Bare ground was $0.35{\pm}0.10$. Weeds control Bare ground was $0.83{\pm}0.14$. The results of the variance analysis of the cover factor for each covering were different according to the cover type. As a result of the classification of the same group through post - analysis, it was found that the Aruncus dioicus and Chewings fescue were similar to each other. Therefore, the Aruncus dioicus was effective to reduce the soil erosion to the extent that it was comparable to the Chewings fescue.

• Korean Journal of Soil Science and Fertilizer
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• v.34 no.2
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• pp.129-133
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• 2001

This studies was carried out to investigate the effects of long term application of organic matters for 21 years from 1979 to 1999. The organic matters were applicated 5 ton $ha^{-1}$ as rice straw and 10 ton $ha^{-1}$ as compost. The used soil was paddy soil of Junbuk series. The obtained results are as follows: For 21 years, the changes of organic matter content of sail was from 22g $kg^{-1}$ to 21g $kg^{-1}$ in the plot of no organic application, but from 25g $kg^{-1}$ to 29gkg^(-1) in the plot of organic matter application. The changes of cation excange capacity of soil were lower gradually in the plot of non-appilcation of organic matter, but were not changed in the plots of rice straw and compost appilcation. The changes of rice yield were highly decreased after 10 years in the plot of no organic matter application, but rice yield were not highly changed in the plot of organic matter application. As conclusion, sussesive application of organic matters is improving physico-chemical properties of soil and is increasing rice yield.

• Research in Plant Disease
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• v.12 no.2
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• pp.108-114
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• 2006

This study was conducted to elucidate the interactions among soil microorganisms in a special field where one, two or three of N, P, K fertilizers were continuously not applied for 29 years. Crop yield (barley, soybean), soil chemical properties and microflora and microfauna including nematodes, nematophagous fungi, actinomycetes, bacteria, and fungi were examined for two years. Tylenchorhynchus sp. was the most important plant-parasitic nematode (range $11{\sim}642/300 cm^3$ soil) followed by Pratylenchus sp. and Helicotylenchus sp. Among nematophagous fungi, Monacrosporium spp. was the most frequently found followed by Harposporium sp. and Cystopage sp. In general, plots treated with phosphate fertilizer yielded more, had more nematodes, bacteria and actinomycetes. In contrast, total fungal population densities including nematophagous fungi, Cystopage sp. and Harposporium sp. were in reverse; they were more abundant in the plots with lower phosphate contents. Phosphate and pH are positively correlated and two most important determining factors for the population density of soil organisms under investigation. According to correlation analysis, Ca, Mg, and $SiO_2$ contents in soil and population densities of Tylenchorhynchus sp., saprophitic nematodes, actinomycetes, and bacteria were positively correlated with pH, but were negatively correlated with fungal population densities. We hope that the study will add an additional knowledges to understand our mysterious underworld.

• Journal of Korea Water Resources Association
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• v.55 no.10
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• pp.823-833
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• 2022

This study aims to improve the runoff modeling accuracy of a basin using Hydrological Simulation Program-FORTRAN (HSPF) model by considering nonhomogeneous characteristics of a basin. By entering classified values according to the various types of land cover and soil to the parameters in HSPF-roughness coefficient (NSUR), infiltration (INFILT), and evapotranspiration (LZETP)- the heterogeneity of the Yongdam Dam basin was reflected in the model. The results were analyzed and compared with the one where the parameters were set as a single value throughout the basin. The flow rate and water quality simulation results showed improved results when classified parameters were used by land cover and soil type than when single values were used. The parameterization changed not only the flow rate, but also the composition ratio of each hydrologic components such as surface runoff, baseflow, and evapotranspiration, which shows the impact of the value set to a parameter on the entire hydrological process. This implies the importance of considering the heterogeneous characteristics of the land cover and soil of the basin when setting the parameters in a model.

• Korean Journal of Soil Science and Fertilizer
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• v.42 no.4
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• pp.307-316
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• 2009

Soil microbial activity and diversity are affected by organic sources applied to improve soil quality and fluctuate seasonally. We investigated the effects of municipal compost (MC), poultry litter (PL), and cover crops of spring oats and red clover (RC) on soil enzyme activities, and soil bacterial community-level physiological profiling (CLPP) in a Mexico silt loam in North Central Missouri, USA. Temporal patterns of these parameters were observed by periodic five soil sampling from spring to fall over a two year period. MC increased soil dehydrogenase (DH) activity consistently beginning about three months after MC application; fluorescein diacetate (FDA) hydrolytic activity significantly began to increase by the September of the first year but fluctuated during the following period. DH activity responded more directly to the amount or properties of organic residues in soils while FDA hydrolysis and CLPP were generally influenced by composition of organic sources, and enzyme activities and CLPP showed seasonal variation, which depended on organic sources and soil moisture. MC and cover crops may be useful organic sources for enhancing general soil microbial activity and altering soil microbial diversity, respectively. Because microbial activities and diversity are dynamic and subject to seasonal changes, the effects of organic amendments on these parameters should be investigated frequently during a growing season.

• Journal of the Korean Wood Science and Technology
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• v.33 no.6 s.134
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• pp.87-94
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• 2005

This study was carried out to investigate the effect of soil types and soil properties on wood preservative leaching. Radiata pine (Pinus radiata Don.) sapwood stakes, which had been treated with 2.0%(w/v) CCA, were leached for 12 weeks by a common laboratory method in four different soils and for 14 days by the AWPA standard leaching method in water. The physical and chemical properties of the four soils were determined, and the percent leaching of the individual component of CCA was correlated with the various soil properties. The data show that leaching of preservative chemicals from treated wood exposed to soil is influenced by the type of soil. The preservative leaching was greater when wood was exposed to water than when the wood was in contact with water-saturated soil. The greatest chromium, copper and arsenic leaching from CCA-treated stakes were observed in the sandy loam, loam, and sand, respectively, and the least amount of leaching of CCA components occurred in the silty loam. The leaching of preservative components from treated wood is extremely complex and appears to be influenced differently by the soil properties. The extent of copper leaching from CCA treated wood appears to be related to exchangeable Mg and sum of bases. There is a reasonably good relationship between chromium leaching and exchangeable Mg, and between arsenic leaching and exchangeable K, soil Ni, Mn, Fe, Cr, or Cu content. Since this study was conducted based on laboratory leaching method using small cross-sectional dimensions; thus, data obtained from this experiment should not be used to predict leaching characteristics from commercial-size wood used in real situation. Accordingly, further studies are necessary using outdoor ground-contact leaching.

• Korean Journal of Organic Agriculture
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• v.15 no.2
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• pp.219-228
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• 2007

강원도 고랭지는 채소 재배지로 그 이용 면적이 매년 급속히 증가하고 있다. 금한 경사와 집중적으로 발생하는 장마철의 폭우는 토양 유실은 물론이고 토양 비옥도의 심각한 저하를 초래할 위험이 경작의 강도와 범위가 넓어짐에 따라 더욱더 증가하고 있다. 또한 험한 지형에 따른 기계화 영농의 어려움과 이에 수반하는 노동력의 낭비로 문제점을 제기한다. 채소 작물 재배를 위해 많이 사용하는 요소 비료, 황산암모늄 비료와 함께 특별히 수지(resin)를 피막 처리한 복합비료를 가지고 배추의 생장과 토양에 미치는 영향을 조사하였다. 수지 피막처리는 각각 7, 10, 15%의 비율로 혼합했다. 배추의 수량은 실험에 사용된 비료간에 큰 차이가 없었다. 요소와 황산암모늄은 기본 시비와 함께 2차례 추비를 하였고 수지 피막 복합 비료는 단 한번 초기에 시비하였다. 따라서 이 경우 노동력 절감과 토양 환경 교란의 최소화를 달성할 수 있었으므로 완효성의 수지 피막 처리 비료가 바람직한 것으로 나타났다. 토양에 미치는 효과는 비료의 종류간에 별다른 차이가 없었으나 인산$(P_2O_5)$의 토양내 축적 현상이 t지 피막 처리 복합 비료 시용 구에서 뚜렷하게 조사되었다. 일반적으로 화학 비료의 시용은 토양 반응(pH)의 저하를 초래하였다.

• Korean Journal of Microbiology
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• v.35 no.1
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• pp.65-71
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• 1999

This study was carried out utilzing ability of sole carbon sources in soil microbial communities used by Biolog GN microplate. Cluster analysis showed that soil microbial cornmuties were categorized into three groups as forest, non-forest soil and naked soil of microbial group. Soil microbial commutites in a forest soil of Qirercus mongoIica was divided into another group microbial communites in Qirercus dendata vegetation soil and Pinus dnzsqlora vegetation soil by Multidimensional scaling(MDS). Generally, sole carbon utilzing abilties were higher in order of polymer, amino acids and carboxylic acids, but it was lower in amides substrates carbon group. From the result: it was supposed that metabolic diversity of microbial communities was corresponded to vegetation succession.