• Korean Journal of Soil Science and Fertilizer
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• v.43 no.6
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• pp.771-775
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• 2010

This study was carried out to investigate soil and environment characteristics of Schizandra Chinensis Baillon habitat as a part of establishment of conservation plan for important medicinal crop resources in Jangsu-gun, Jeollabuk-do. These habitats are mostly located on the slopes of mountains facing northwest at an altitude of 500 m to 700 m with angles of inclination ranging from 17.6 to 36.4%. Average yearly precipitation and temperature of Schizandra Chinensis Baillon habitat were 1,493.4 mm and $16.9^{\circ}C$, respectively. The number of plant species growing in Schizandra Chinensis Baillon habitat was found 55 species. Salix gracilistyla, Lespedeza bicolor, and Artemisia princeps var. were shown higher density and coverage. Chemical quality of Schizandra Chinensis Baillon habitats soils was relatively higher than artificial cultivation soil.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2003.09a
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• pp.128-131
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• 2003

To clarify the effect of soil property on the EK-Fenton remediation of the soil contaminated with phenanthrene, this research had been conducted. In the experiments using EPK kaolinite, the $H_2O$$_2$ stability and effect of phenanthrene treatment improved more than that in the experiments using Hadong clayey soil. The results signify that Fe oxide content and acid buffer capacity significantly affected the fate of $H_2O$$_2$ and phenanthrene during the EK-Fenton process.

• Journal of Korean Society of Environmental Engineers
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• v.39 no.6
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• pp.311-317
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• 2017

The aim of this study is to investigate the environmental properties of paddy soils depending on farming methods and seasonal variation. The paddy soils in 11 plots of conventional paddy and 24 plots of organic paddy were sampled and analyzed in four season of March, May, August, and October. The obtained data of soil properties were used for statistical analysis. Analysis of variance showed that only $NH_4-N$ and $P_2O_5$ were significantly different depending on farming methods. However, the differences of all soil properties depending on seasonal variation were strongly significant. Principal component analysis also presented that nitrogen and phosphorus concentration in soils were more significantly influenced by seasonal variation than farming method. Electric conductivity in soil was decreased from March to October. Amounts of soil organic matter in August and October were higher than that in March and May. T-N was decreased from March to October. $NH_4-N$ and $NO_3-N$ in the soil of both conventional and organic paddy were higher in May than other seasons. T-P concentration was found to be highest in August, but $P_2O_5$ concentration was lowest in August. It can be concluded that seasonal variation should be considered for analysis and comparison of soil environmental properties.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2005.04a
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• pp.336-339
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• 2005

포천지역의 포천천과 그 주변의 8개 소유역을 대상으로 2003년 8월부터 2004년 8월까지 하천 8개 지점과 기존 지하수 관정 66개소를 선정하여 수리지구화학 및 환경동위원소 연구를 실시하였다. 복합적인 토지이용과 관련하여 연구지역 수계에서는 오염물질 유입이 광역적으로 인지되었으며, 일부 지역에서는 지하수계로의 오염물질 유입이 강하게 나타나 인근 하천까지 영향을 줌이 확인되었다. 오염기원으로 해석되는 대표적인 무기이온종인 $NO_3,\;Cl,\;SO_4$의 존재비를 이용하여 연구 지역의 지표수와 충적 지하수를 크게 3개 수질 그룹으로 분류하였다. 이들 그룹들은 각각 특징적인 충진 특성과 용존 이온의 분포/거동 양상을 나타내는 것으로 해석된다. 본 논문에서는 세 유형의 지표수/충적 지하수 외에 암반 지하수를 포함하여 연구지역 자연수의 수리지구화학 진화 경로와 오염물질의 유입 및 거동 양상에 대하여 토의한다.

• Korean Journal of Soil Science and Fertilizer
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• v.14 no.3
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• pp.110-116
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• 1981

Soil surface charge which manipulates some important soil physico-chemical properties such as nutrient and water holding abilities, colloidal stability and soil erosion was investigated in wide range of soil pH, using soils developed originally from same volcanic ash deposit but under different rainfall condition in Hawaii. The results can be summarized as follows : 1. Ustollic Camorthid (Kawaihae soil) which was developed under the lowest rainfall (less than 500 mm/yr) revealed low Z.P.C. (4.5-5.0) and less dependence of net charge on concentration of indifferent electrolytes. 2. Typic Hydrandepts (Akaka and Hilo soils) which were developed under the high rainfall (3050-7600 mm/yr) showed the Z.P.C. in between 5.5-7.0 and high dependence of net charge on concentration of indifferent electroytes. 3. It was found by X-ray diffraction together with total chemical analysis that amorphous materials were dominant (above 6.0%) in Typic Hydrandepts while dehydrated halloy-site (1 : 1 clay minerals) was dominant (45-50%) in Ustollic Camorthid. 4. In spite of little difference in particle size distribution of the soils, the difference of specific surface area was remarkable showing the order of Akaka (289) > Hilo (268) > Kawaihae (93). 5. It was evident, taking account of apparent field pH values, 5.2 of Akaka, 5.5 of Hilo and 7.0 of Kawaihae soil, respectively, that Akaka, and Hilo soils would show either positive or near zero (+ or 0) of ${\Delta}pH$ while Kawaihae soil would exhibit negative (-) of ${\Delta}pH$ at natural field condition.

• Korean Journal of Soil Science and Fertilizer
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• v.43 no.6
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• pp.837-843
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• 2010

This research investigated classification of clay activity degree by different clay mineral components. Based on compositions of different clay and oxide minerals within 390 soil series in Korea, 7 soils were selected to analyze for CEC and specific surface area of clay minerals. As a result, soils were mainly composed with Chlorite originated from sandstone, Smectite originated from Andesite porphyry and combination of Allophane and Ferrihydrite originated from volcanic ash, if the ratio of CEC value to clay content (degree of clay activity) was greater than 0.7. If the degree of clay activity was ranged between 0.3 and 0.7, soils were composed mainly with Kaolin originated from anorthite. Soils with this ratio also was composted with combinations of Kaolin, Illite and Vermiculite originated with river deposits. When the degree of the activity was less than 0.3, soils were commonly red-yellowish color and composed with two different minerals. One type of composition was Kaolin originated from granite and granite gneiss and the soils contained Geothite and Hematite. The other type was composited mainly with Illite and Vermiculite minerals originated from granite. These soils contained Gibbsite, Geothite and Hematite. The degree of clay activity was highly related with CEC and specific surface area. The greater degree of the activity displayed greater values of clay CEC and specific surface area. It is not easy to measure actual quantity and compositions of clay minerals, while the degree of clay activity can be measured from routine soil analyses. As a conclusion, the degree of clay activity may be not just a simple but also powerful tool to estimate physical-chemical properties of soils and to evaluate the soil classification in Korean soils.

• Korean Journal of Soil Science and Fertilizer
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• v.31 no.1
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• pp.9-15
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• 1998

A survey was conducted to investigate the chemical properties of soils such as pH, electrical conductivity, total organic matter content, soluble nitrate, available phosphate and major exchangeable canons, in plastic film houses at 513 sites. All the parameters surveyed in the plastic film house were much higher than those of open field soils. Particularly conspicuous was the accumulation of available P, exchangeable K and the occurrence of nitrate at relatively high concentration in both top soil(0-20 cm) and sub-soil(20-40 cm). In 70-80% of cases, the contents of available P and exchangeable K in top soils, were found to be higher than optimum levels. There was positive linear correlation between the content of exchangeable rations, and nitrate and EC of soils. The correlation coefficient was greater in the order of nitrate-EC > Mg-nitrate > K-nitrate > Ca-nitrate. The successive cultivation of horticultural crops in the plastic houses tended result in the accumulation of available P, exchangeable K and total organic matter in the soil.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2020.12a
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• pp.70-70
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• 2020

참취(Aster scaber)는 국화과에 속하는 여러해살이식물로 취나물로 분류되어 전국에서 재배되고 있으며 최근 성인병 예방 효과와 무공해 건강식품으로 연중 소비가 증대되고 있으며, 주로 시설재배 작형으로 많이 재배하고 있다. 참취 시설재배지는 양분의 과다투입에 의한 염류집적과 잦은 관수로 물리성이 악화 되어 참취의 생육이 저하되어 수량이 감소하여 통상 3년 마다 종묘 갱신이 이루어지고 있다. 본 연구는 토양개량제 처리에 따른 토양 물리화학성과 참취의 생육에 미치는 영향을 검토하여 참취 시설재배 농가에 활용할 수 있는 방안을 개발하고자 시험을 수행하였다. 2018년 4월부터 2020년 11월까지 전라북도 농업기술원 허브산채시험장에서 참취 시설재배를 대상으로 무처리, 볏짚, 왕겨숯, 야자섬유 등을 10a당 1,000kg 처리하여 시기별 토양 이화학성, 생육특성을 조사하였다. 자재 처리 후 토양물리성의 변화는 볏짚 시용에서 가장 낮은 용적밀도 1.35g/cm³와 가장 높은 공극률 49.04%을 보였다. 토양 삼상 중 고상은 왕겨숯에서 52.82%로, 액상은 왕겨숯에서 30.28%로, 기상은 볏짚에서 22.45%로 가장 높았다. 토양 화학적 특성을 조사한 결과 모든 처리구에서 토양유기물 함량은 증가하였고, 유효인산은 함량은 440~487mg/kg로 낮아지는 경향을 보였다. 칼륨은 0.77~0.88cmol_c/kg로 낮아졌고, 칼슘과 11.56~14.09cmol_c/kg, 마그네슘은 2.93~3.22cmol_c/kg로 증가하였다. 생육특성은 볏짚 처리구에서 초장 26.4cm, 엽장 8.7cm, 엽폭 6.7cm, 줄기수 7.2주로 다른 처리구에 비해 좋은 생육이 좋았으며, 수량 또한 볏짚 처리구에서 1,554.3kg/10a로 가장 높았다. 지하부 생육특성은 볏짚 처리구에서 근중 83.7g/주, 근장 28.2cm, 근직경mm로 다른 처리구에 비해 생육이 양호하였다. 참취 다년재배지 정신 전 볏짚을 시용함으로써 토양의 유기물함량 증가와 용적밀도 감소, 공극율 증가 등 토양의 물리화학성을 개선하여 참취 수량성 증대효과가 있는 것으로 판단된다.

• Journal of the Korean Geotechnical Society
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• v.40 no.1
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• pp.39-46
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• 2024

Artificial recharge systems have been employed to solve drought problems due to global climate change. Despite the increased usage, the applications of artificial recharge systems are limited by clogging problems, which reduce recharge rates. In this study, the soil texture and mineral characteristics of alluvial soil in a planned artificial recharge system area were investigated to evaluate the possibility of chemical clogging during the injection of stream water. The primary minerals contained in the clastic particles are quartz, K-feldspar, plagioclase, and biotite, and the secondary minerals filling the pore space are illite, kaolinite and Fe-oxide. The fact that carbonate and sulfate are observed as secondary minerals in the pore space suggests that chemical clogging has not occurred by the interaction between the groundwater and surface water in the study area. Thus, monitoring soil properties, e.g., the formation and growth of secondary minerals in the pore space, is required to investigate the possibility of chemical clogging in artificial recharge systems.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2002.09a
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• pp.331-334
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• 2002

탄산수내 REEs의 함량과 거동특성을 알아보기 위해 암석시료, 탄산수 및 침전물에 대한 REEs 분석을 실시하였다. 탄산수가 산출되는 인접지에서 채취한 암석시료들은 물의 유형에 따라 큰 농도변화를 보여주지 않으며, 대체적으로 LREEs가 부화된 특성을 보여주고 있다. 유형에 따른 탄산수의 REEs 농도변화는 서로 상이한데, Na-HCO$_3$ 유형은 강한 HREE의 부화를 보여주지만, Ca-HCO$_3$ 유형은 HREE의 부화를 보여주지 않고 감소하는 경향을 보이며, 화학적으로 중간 유형에 속하는 Ca-Na-HCO$_3$ 유형 탄산수는 Eu을 제외하고는 전체적으로 flat한 분포를 보여준다. 탄산수에서 침전된 침전물과 침전물을 제거한 물의 REE의 유형은 침전물이 발생되기 전의 탄산수와 유사한 경향을 보이지만, 침전물의 발생으로 인한 특징적이고 강한 anomalies를 보여준다. 침전된 침전물의 REEs 특성은 침전물이 발생되기 전의 원 탄산수와 거의 유사한 분포특성을 보여준다. 반면에 침전물을 제거한 탄산수에서는 탄산염침전물의 침전과 연관되어 매우 강한 Eu anomalies를 보여주며, 대체적으로 HREE가 부화된 특성을 보여주었다. 탄산수내 가장 우세한 REE 종은 CO$_3$$^{2-}$ 종이며, CO$_3$$^{2-}$ 복합체 때문에 REEs의 분별작용 (HREE의 부화)이 일어나는 것으로 판단되 었다.