• Proceedings of the Korea Water Resources Association Conference
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• 2020.06a
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• pp.196-196
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• 2020

토양은 육상생태계에 있어 가장 많은 탄소를 저장하고 있으며, 대기 중 CO₂를 토양탄소로 전환하여 쉽게 방출되지 않고 토양 내에 저장하는 역할을 한다. 이렇듯 토양 유기탄소 배출관리는 기후변화에 있어 중요한 문제로 대두되고 있다. 하지만 토지이용의 변화와 무분별한 관리로 인하여 토양내에 저장되어 있는 토양 탄소배출이 지속적으로 증가 하고 있다. 따라서 토양탄소 배출로 인한 경제적 피해를 수치적으로 표현하는 가치평가가 필요하다. 현재 토양에 저장된 토양유기탄소 함량을 토양통별로 토양정보시스템에서 제공하고 있지만 국내 토양 토양탄소 저장량의 산정에 관한 연구는 미비한 실정이다. 따라서 본 연구에서는 토양 특성을 이용하여 토양 유기탄소 저장량을 산정하고, 산정된 토양 유기탄소 저장량과 정밀토양도를 이용하여 남한의 토양 유기탄소 가치평가를 실시하였다. 토양의 특성은 물리적 특성인 모래(Sand), 이토(Silt), 점토(Clay), 자갈(Gravel)함량과 화학적 특성인 유기물함량(Organic Matter)를 사용하였다. 토양 유기탄소저장량 산정의 검증을 위하여 전라남도 진도군의 토양유기탄소 저장량을 산정한 결과 486,696t으로, 선행연구와 유사한 결과를 나타내었다. 이러한 검증 결과를 바탕으로 남한의 토양 유기탄소 저장량을 산정한 결과 305.54Mt의 유기탄소가 저장된 것으로 나타났으며, 단위 면적당 유기탄소 저장량의 경우 3.11kg/㎡으로 나타났다. 또한 2019년 상반기 기준 평균 탄소거래권 가격(27,500원/톤)을 이용하여 우리나라 국토의 토양탄소 저장량 가치평가를 실시한 결과, 약 8조 4천억원의 경제적 가치가 있는 것으로 나타났다. 본 연구는 토양의 물리적·화학적 특성을 이용하여 토양의 유기탄소 저장량을 산정하였으며, 토양에 저장되어 있는 유기탄소의 가치평가를 수행하였다. 본 연구결과는 농업, 수문, 기후변화 등 다양한 분야에서 필요로 하는 기초자료로 활용될 수 있을 것으로 판단된다.

• Magazine of the Korean Society of Agricultural Engineers
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• v.39 no.6
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• pp.80-87
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• 1997

A series of tests was performed to determine a threshold concentration of water-soluble organic permeant(ethanol) for permeability to be increased in clay and to estimate long-term permeability behaviors, effects of overburden pressure and compaction conditions on permeability in clay. Results of study are as follows ; 1. A threshold concentration of water-soluble organic permeant(ethanol) in clay was about 7O~8O% and its dielectric constant was 40, and dielectric constant seems to be closely related with absolute permeability. 2. Permeability of long-term tests was more or less larger than that of short-term tests. 3. Overburden pressures applied for a long time elapsed have little effects on the restriction of permeability increase. 4. Since water content has no effects of compaction capability when it is compacted with OMC or wet side of OMC, its permeability is to be estimated as same level of dry side of OMC. 5. Clays matured in the humid chamber are increased in permeability 2 times larger than unmatured ones. Thixotropy, therefore, should be considered in the design procedures because field conditions of construction would be quite similar to this..

• Journal of the Mineralogical Society of Korea
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• v.26 no.2
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• pp.65-80
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• 2013

Sediment transport mechanism and distribution of organic sediments are elucidated by the study of particle size, mineralogy, organic matters and microfossils of the surface samples collected from seafloor adjacent Dokdo island. Shallow marine sediments are dominated by coarse- grained sediments including gravel and sand, and their sedimentation has mainly been controlled by traction. While the samples collected from oceanic zone are characterized by high contents of fine- grained sediments such as silt and mud in bulk sediments, and the changes of mineral compositions including clay minerals and feldspar, and the fine sediments have been deposited mainly by suspension. The change of organic sedimentary communities is detected between neritic and oceanic zone. Although marine organic matter is predominant in neritic zone, terrestrial organic matter is monopolized according to increasing water depth. This trend is associated with grain size of sediments. The results also suggest that high pollen concentrations in whole organic matters may played an important role in excessive organic carbon in sediment.

• Journal of the Korean Ceramic Society
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• v.41 no.1
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• pp.41-44
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• 2004

Hydrophilicity and hydrophobicity of pottery bodies can be controlled via chemical substitution of layered clay with hydrophilic and hydrophobic organics. In this study, organo-clay nanocomposites were prepared by ion-exchange of montmorillonite with dodecylamine and hexadecylamine, respectively. Substitution sites of organics and the interval changes of layered materials are characterized by FT-IR and WAXD and organics amounts loaded and water comtents contained by C/S analysis and TG-DSC. The organics were selectively intercalated so that increase layer interval from 12${\AA}\; to\;16{\AA}$. Organo-modified clay is changed to more hydrophobic comparing to clay itself.

• Korean Journal of Plant Resources
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• v.13 no.2
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• pp.140-146
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• 2000

This study was conducted to determine the effect of cutting type, growth regulators and propagation media on the rooting and root growth of Roea davurica $P_{ALL}$. Three type of cutting, hardwood, half-softwood, softwood cutting and root cutting of Rosa davurica $P_{ALL}$, were used to study the rooting ability. There was no rooting in hardwood cutting while root cutting was appeared 100% of callus formation and rooting. The optimum conditions of softwood cutting for rooting were IAA 100ppm and rooton-F at vermiculite+perlite. The rate of rooting in treatment of rooton-F ranged from 10 to 60%, but such a good effect was not appeared in other growth regulators, IAA, NAA and IBA.

• Proceedings of the Korean Society for Applied Microbiology Conference
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• 1976.10a
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• pp.186.3-187
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• 1976

섬유소단세포단백의 공업적 생산을 위하여 실험적인 결과를 토대로하여 Jar Fermentor에 의한 scale up 실험을 하였고, pilot plant scale의 발효조를 이용하여 대량생산 실험을 하였는 바 그 결과를 발표하고자 한다. 1. 배양중 생성되는 유기산을 중화하기 위하여 주입되는 암모니아의 소비량과 균체농도는 배양종반을 제외하고는 거의 비례하였으며 암모니아소비량으로 균체생육 정도를 간접적으로 판단할 수 있었다.(중략)

• Proceedings of the Korean Society of Rheology Conference
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• 2003.05a
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• pp.159-162
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• 2003

No Abstract, See Full Text

• Asian Journal of Turfgrass Science
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• v.25 no.1
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• pp.69-72
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• 2011

Soil aggregate is a vigorous procedure including soil physical, chemical, and biological processes. Pore space created by binding these particles together improves retention and exchange of air and water. Various researches have reported that the benefits of organic polymers that may increase aggregate stability. The purpose of the study was to determine if a liquid organic polymer mixture has any influence on perennial ryegrass quality or soil aggregation. $Turf2Max^{(R)}$ was applied to two soils as a source of liquid organic polymer. Fine-loamy soil from local Iowa topsoil with 4.0% organic matter was screened and dried. Commercial baseball infield clay, $QuickDry^{(R)}$, was used as the second soil There were three rates of liquid organic polymer (0, 2, and 4%). there was no visual improvement in turf grass color, quality, or growth by using organic polymer. It is possible that aggregate stability increases with use of organic polymer. The aggregate stability study needs to be repeated in the greenhouse and then substantiated under field conditions for these preliminary observations.

• Journal of the Korean earth science society
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• v.33 no.4
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• pp.320-328
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• 2012

To investigate geomorphic development of alluvial plains and climatic environment change during the late Holocene carbon dating, soil organic carbon analysis and humus analysis of sediments from alluvial plain of Hampyeongcheon basin were performed. The lowest peat layer was formed under warm and humid climates, which is considered to correspond to the Atlantic period in the Holocene. Yellowish brown sandy clay layer was deposited in the natural levee, which we think were deposited in the generally warm and dry climates. The carbon dating age is 1,879-1,532 BC, and this period correspond to the Sub-boreal period in the Holocene. Light brown clay layer is assumed to have been deposited in transitional environment from the natural levee to the back marsh. The climatic environment was warm and humid, which is considered as transitional period from the Sub-boreal to the Sub-Atlantic in the Holocene. Light yellowish brown and light brown clay layer of the upper part are regarded as sediments of the back marsh. Light yellowish brown clay layer was deposited in the cold and dry climates, which is considered to correspond to the Sub-Atlantic period in the Holocene. Light brown clay layer was deposited in the warm and dry climates. The carbon dating age is 211-427 AD, this period corresponds to the Post Roman Warm Period in the Holocene.

• The Journal of Engineering Geology
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• v.16 no.4 s.50
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• pp.403-409
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• 2006

This study was performed to assess the clay impact on alga growth which was a primary producer, in view of food chain in ecosystem. As clay minerals caused turbidity, a low sedimentation, high adsorption capacity with organic matter, adsorption - desorption effect with ionic chemicals, clay minerals were supposed to have a significant effect on the aquatic system. In study we tried to turn out NOAEL (No-observed-adverse-effect-level) of clay materials on the algae growth inhibition using such as kaolinite, sericite and montmorillonite. This study was indicated. (1) In both of kaolinite and sericite, the $72hr-EC_{50}$ of them shows 2,752 mg/L and 2,775 mg/L, respectively. (2) On the other hand, in the case of montmorillonite, the $72hr-EC_{50}$ is not shown a significant difference to that of control samples. (3) It can be explained that is also a very important parameter in an alga growth. Because an alga growth was increased when the permeability of W visible radiation was increased in all clay cases. (4) It is demonstrated alga growth was affected by the characteristics of clay materials. Hence we can assess the $\ulcorner$water environmental risk assessment caused clay materials$\lrcorner$ using the alga growth inhibition level indirectly.