• 한국환경생태학회지
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• 제26권6호
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• pp.868-875
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• 2012

본 연구는 홍도원추리개체군을 식물사회학적 방법으로 분류하고, 식생과 환경과의 상관관계를 밝히고자 분포서열법을 사용하여 분석하였다. 홍도원추리개체군은 예덕나무 우점개체군, 산가막살나무 우점개체군, 애기며느리밥풀 우점개체군으로 분류되었다. 홍도원추리 개체군은 주로 한반도 남서해안 도서에 분포하고 해발고는 6~362m의 해안가의 낮은 사면과 섬의 능선의 평균 $36.7^{\circ}$의 경사지에 위치하고 있다. 토양의 이화학적 특성을 분석한 결과 유기물함량은 16.18~21.70%, 전질소함량 0.56~0.97%, 치환성 K $0.42{\sim}0.88cmol^+/kg$, 치환성 Ca $3.38{\sim}5.65cmol^+/kg$, 치환성 Mg $1.12{\sim}2.38cmol^+/kg$, 양이온치환용량 $25.93{\sim}41.45cmol^+/kg$이며, 토양 pH는 4.45~4.86인 것으로 조사되었다. 예덕나무 우점개체군은 사면경사가 급하고 양료 중 CEC와 전질소가 높은 지역에 분포하였고, 애기며느리밥풀 우점개체군은 사면경사가 중간이고 CEC와 전질소의 양료가 중간인 입지에 분포하였다. 그리고 산가막살나무 우점개체군은 사면경사가 완만하고, CEC와 전질소의 양료가 적은 입지에 분포하는 것으로 나타났다. 천연보호구역으로 지정된 홍도에 분포하는 홍도원추리개체군의 생육특성을 파악하고 개발로 인한 훼손으로부터 자생지의 보전을 위한 구체적인 대책 마련이 요구된다.

• 한국농공학회논문집
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• 제59권5호
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• pp.41-49
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• 2017

This study was aimed to investigate the influence of cation exchange capacity (CEC) and application amounts of zeolite on the stabilization of heavy metals (As, Ni, Pb, and Zn) in upland soils. The upland soils were sampled from field near mines located in Gyeonggi Province. The CEC of zeolite was treated at three different levels, ie, low, medium, and high, while zeolite was amended with soils at the ratio of 0.1 % and 0.5 % as to soil weight. A sequential extraction was performed for the soil sampled at 1, 2 4, and 8 week after zeolite was added to the soil. The concentrations of Pb and Zn appeared to be high in the sampled soils. The mobility of heavy metals obtained from sequential experiments was as follows: Pb > Zn > Ni >As. Addition of zeolite to contaminated soils effectively reduced exchangeable and carbonate fractions but increased organic and residual fraction, indicating that zeolite is effective for immobilizing heavy metals in soils. The influence of incubation time on the metal stabilization was rather pronounced as compared to the application amount and CEC of zeolite.

• 한국토양비료학회지
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• 제17권2호
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• pp.173-178
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• 1984

옥수수 수량(收量)과 토양(土壤)의 화학적특성(化學的特性)과의 상관관계(相關關係)를 검토(檢討)하여 옥수수 재배지토양(栽培地土壤)의 토양화학성(土壤化學性) 개량(改良) 기준(基準)을 설정(設定)할 목적(目的)으로 16개(個) 옥수수 시범재배포장(示範栽培圃場)을 대상(對象)으로 조사(調査)한 결과(結果)를 요약(要約)하면 다음과 같다. 1. 옥수수 수량(收量)과 토양화학성(土壤化學性)과의 상관관계(相關關係)에서 $pH\;r=0.706^{**}$, $Av.\;P_2O_5\;r=0.675^{**}$, $Ex.\;K\;r=0.697^{**}$, $Ex.\;Ca\;r=0.763^{**}$, $Ex.\;Mg\;r=0.626^{**}$, $CEC\;r=0.803^{**}$, $Av\;SiO_2\;r=0.670^{**}$, $B.S\;r=0.729^{**}$로 정(正)의 상관관계(相關關係)를 나타내었으나 유기물(有機物) 및 전질소함량(全窒素含量)과는 유의성(有意性)이 인정(認定)되지 않았다. 2. 옥수수에 대한 토양중(土壤中) 적정무잔성함량(適正無棧成含量)(1,000kg/10a생산기준(生産基準))은 pH5.6, Av $P_2O_5$, 327ppm, Ex. K0.39me/100g, Ex. Ca 5.5me/100g, Ex. Mg1.3me/100g, Ex. Al 0.44me/100g, CEC 11.5me/100g, Av. $SiO_2$, 116ppm. B.S 58%로 추정(准定)되었다. 3. 토양중(土壤中) 치환성(置換性)알루미늄함량(含量)은 옥수수 수량(收量)뿐만 아니라 토양산도(土壤酸度), 유효인산(有效燐酸), 치환성가리(置換性加理), 치환성석회함량(置換性石灰含量)과도 유의성(有意性)있는 부(負)의 상관관계(相關關係)를 나타내었다.

• 한국환경복원기술학회지
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• 제15권1호
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• pp.15-25
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• 2012

Arundinaria munsuensis population were classified into Lespedeza maximowiczii dominant population and Spiraea prunifolia for. simpliciflora dominant population in the habitat of Jiri Mt. In the study sites, soil organic matter, total nitrogen, available phosphorous, exchangeable K, exchangeable Ca, exchangeable Mg contained, cation exchange capacity, and soil pH were ranged from 14.52~16.13%, 0.57~0.59%, 5.57~10.24 (mg/kg), 0.44~0.49 ($cmol^+/kg$), 0.62~0.92 ($cmol^+/kg$), 0.31~0.32 ($cmol^+/kg$), 28.26~32.44 ($cmol^+/kg$) and 4.33~4.48 respectively. DCCA ordination analysis showed that Lespedeza maximowiczii dominant population dwells where pH, exchangeable Ca and exchangeable Mg content are high and Spiraea prunifolia for. simpliciflora dominant population is placed where CEC, total nitrogen and organic matter content are high.

• 한국환경농학회지
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• 제42권4호
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• pp.338-345
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• 2023

Bacillus spp. and Saccharomyces spp. are effective microorganisms that are applied as microbial fertilizers for crops in Korea. Mixed organic fertilizer (MOF) has been used in the Korean organic agriculture to supply nutrients to crops. This study was conducted to investigate the effects of MOF containing Bacillus amyloliquefaciens HSOB-7 and Saccharomyces cerevisiae HSOB-8 (MOFBS) on the soil chemical properties and growth of lettuce (Lactuca sativa). Growth factors of lettuce were higher after applying different formulation types of MOFBS, such as powder and pellet, than those of NF, and not significantly different than those of control (microbe-free MOF). Compared with the control, application of recommended amount of MOFBS (MOFBS 250 kg/10a, MOFBS treatment) and double the recommended amount (MOFBS 500 kg/10a, 2MOFBS treatment) did not significantly change the growth factors of lettuce. After the application of two formulation types or two different amounts of MOFBS, soil chemical properties such as electrical conductivity, organic matter (OM), exchangeable Ca, and cation exchangeable cation (CEC) increased. These results indicated that although the application of MOFBS improved soil fertility including OM and CEC, it did not significantly affect lettuce growth.

• 한국환경농학회지
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• 제42권1호
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• pp.1-7
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• 2023

Super absorbent polymers (SAPs) are hydrophilic molecules that can absorb large amounts of water. This study was conducted to investigate the enhancement of the physicochemical properties of sand soil blended with three SAPs imbibed with 100, 150, and 200-fold water. Three treatments were applied, namely, 100SAP, 150SAP, and 200SAP. The three SAPs were blended at concentrations of 0% (control), 3%, 5%, 7%, and 10% with sand. The pH, electrical conductivity, and cation exchangeable capacity (CEC) of soil blended with the three SAPs were pH 6.35-6.46, 0.09-0.65 dS/m, and 1.42-1.92 cmol_c/kg, respectively, and their capillary porosity, total porosity, and saturated hydraulic conductivity were 21.0-29.3%, 39.2-48.7%, and 272-470 mm/hr. CEC, capillary porosity, total porosity, and saturated hydraulic conductivity of soil were positively correlated with the ratio of the SAPs (p<0.01). These results indicate that blending sand soil with SAPs increased CEC, capillary porosity, and saturated hydraulic conductivity, thus improving the nutrient-retention capacity, water-retention capacity, and permeability of the soil.

• 한국토양비료학회지
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• 제42권Spc호
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• pp.33-39
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• 2009

논토양에서 지속가능한 농업생산 및 환경보호를 위한 양분관리는 토양의 화학반응들에 따른 지표들을 활용하는 것이다. 이 연구는 동일비료 영년시험 결과와 2000년부터 2002년까지 수행된 논토양 유형별 질소수준 시험 결과 등을 토대로 하여, 논토양의 화학작용 및 이와 관련된 양분공급력 지표들을 조사하였다. 논토양의 화학작용은 영양성분의 흡탈착 및 유기물질의 분해를 통한 수소, 전자, 이산화탄소의 생성작용과 이들 물질에 의한 화학작용 등으로 구성되었다. 이러한 토양의 화학작용을 고려한 양분공급력 지표들은 다음과 같았다. 질소의 공급력 지표는 토양유기물 또는 토양단백질이었으며, 인산의 공급력 지표는 유효인산함량이었고, 칼륨의 공급력 지표는 양이온교환용량과 치환성 양이온함량이었다. 한국에서는 논토양의 시비 추천식은 이러한 양분공급력 지표들을 사용하여 설정한 것으로 나타나 환경을 보전하면서 농업생산을 지속적으로 유지할 수 있는 것으로 판단된다.

• 한국환경복원기술학회지
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• 제13권3호
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• pp.84-93
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• 2010

This study was carried out to analyze the vegetation properties, soil characteristics and ordination of Leontice microrhyncha population in South Korea. The Leontice microrhyncha population was classified into Quercus mongolica dominant population, Morus bombycis dominant population, Fraxinus mandshurica population and Leontice microrhyncha typical dominant. The Leontice microrhyncha population was located at an elevation of 633m to 1,336m in Korea. In the study sites, soil organic matter, total nitrogen, available phosphate, exchangeable potassium, exchangeable calcium, exchangeable magnesium, cation exchange capacity and soil pH were 8.40~10.58%, 0.42~0.61%, 14.15~25.07mg/kg, 0.44~0.59cmol$^+$/kg, 2.35~6.33cmol$^+$/kg, 0.35~0.98cmol$^+$/kg, 26.04~33.48cmol$^+$/kg and 4.69~5.32 respectively. Morus bombycis dominant population was found in the low elevation and gentle sloped area that has high percentage of phosphoric acid and less percentage of total nitrogen, exchangeable calcium, exchangeable magnesium than other dominant population. Fraxinus mandshurica dominant population and Leontice microrhyncha typical population were found in the comparatively high elevation area that has low percentage of phosphoric acid and high percentage of total nitrogen, exchangeable calcium, exchangeable magnesium. Quercus mongolica dominant population was found in the medium elevation area that has medium percentage of total nitrogen, exchangeable calcium, exchangeable magnesium.

• 한국환경복원기술학회지
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• 제13권1호
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• pp.24-31
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• 2010

This study was carried out to analyze vegetation and soil characteristic, and ordination of Scrophularia takesimensis population, Ulleung Island. The Scrophularia takesimensis population was classified into Aster spathulifolius for. oharai dominant population, Vitis amurensis dominant population and Scrophularia takesimensis typical population. The Scrophularia takesimensis population was located in elevation of 1m to 6m, in Ulleung Island. In the study sites, soil organic matter, nitrogen, available phosphorous, exchangeable potassium, exchangeable calcium, exchangeable magnesium and exchangeable sodium concentration, and cation exchange capacity, and soil pH were 9.1~19.1%, 0.19~0.52%, 87.1~196.7mg/kg, 2.0~2.8cmol+/kg, 5.4~5.9cmol+/kg, 5.9~8.8cmol+/kg, 4.4~4.8cmol+/kg, 20.3~26.7cmol+/kg, and 6.8~8.0, respectively. The Vitis amurensis dominant population was mainly found in the high percentage of total nitrogen, organic matter, CEC in comparison with Aster spathulifolius for. oharai dominant population.

• 한국재료학회지
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• 제14권3호
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• pp.229-234
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• 2004

All the applications of natural zeolites make use of one or more of their physical and chemical properties: adsorption, ion-exchange and related molecular sieve properties, dehydration and rehydration, and siliceous composition. Accordingly, the applications of zeolite have been carried out in the various aspects because of its large cation exchange capacity and adsorption properties. In this paper, the adsorption effect of heavy metal ions in wastewater on zeolite mineral by batch adsorption process is studied. The amounts of adsorbed ions were variable by original pH and ionic concentration, especially original pH of solution had an important effect on the adsorption. In case of low pH solution, e.g. below 3.0, clinoptilolite adsorbed $Pb^{2+}$ ,$ Cd ^{2+ }$ , $Cu^{2+}$ and $Zn^{ 2+}$ , but mordenite almost did not adsorb except $Pb^{2+}$ . Under the same conditions, these ions were more adsorbed on clinoptilolite than on mordenite mineral. The velocity of adsorption was relatively fast and it was confirmed by shaking test that the equilibrium of adsorption could be attained in about one hour. The species of exchangeable cation of zeolite had an effect on its removing ability and zeolite of the sodium-exchanged type was the best.