• 한국지반환경공학회 논문집
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• 제15권12호
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• pp.43-51
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• 2014

준설토 내 유기물질은 지반침하, 균열, 지지력 저하 및 내부마찰각 감소 등 지반공학적으로 많은 문제를 가지고 있는 반면 농업의 관점에서는 지반 내 유기물질이 함유되어 있을수록 양질의 토사로서 식생의 성장에 크게 기여한다. 따라서 본 논문에서는 유기질을 함유한 준설토를 재활용하여 고화토를 제작하였으며, 고화토의 유기질 함량(0 %, 10 %, 20 %, 30 %)에 따른 역학적 특성과 식생발아 특성과의 관계를 분석하였다. 유동성 시험, 일축압축 시험 및 압밀 시험 등 다양한 실내 시험을 통해 고화토의 역학적 특성을 알아보았으며, pH, 발아율 및 초장길이 측정을 통해 식생발아 특성을 알아보았다. 실험 결과 유기물 함량이 증가할수록 일축 압축강도는 감소하고 압축지수 및 팽창지수는 증가하는 것으로 나타났다. 반면 식생의 발아율 및 초장길이는 유기물 함량이 증가함에 따라 점차 증가하는 경향을 보였다.

• 한국습지학회지
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• 제9권3호
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• pp.1-12
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• 2007

본 연구에서는 양산 신불산 고층습원인 달포늪 퇴적물의 입도, 주상도 및 유기물함량을 분석하여 퇴적물 입도와 종류에 따른 유기물함량의 상관성을 규명하였다. 연구지역인 달포늪은 3개 습지로 구성되어 있으며, 습지면적은 약 $31,295m^2$ 이다. 달포늪 퇴적물의 입도분석은 7개 지점(습지A 3개, 습지B 3개 및 습지C 1개)에서 채취된 시료를 이용하였으며, 건식체분석과 피펫분석이 수행되었다. 입도분석 의하면 퇴적물 입도는 습지의 가장자리로 갈수록 크고, 습지A > 습지C > 습지B의 순으로 나타났다. 습지A와 습지B의 장축 및 단축과 습지C의 장축 방향에서 수평거리별 시추조사가 수행되었다. 습지A의 장축에서는 점토질 이탄층이 지표면하 심도 10~90cm 정도로 분포하고 있으며, 습지 중앙부인 수평거리 100 m 지점에서 지표면하 심도 90 cm로서 가장 두꺼웠다. 습지B에서는 점토질 이탄층의 지표면하 심도가 27 cm 이하로서 습지로서의 수명이 다해가고 있음을 알 수 있었다. 습지C는 규모가 적어 퇴적물의 조성이 단순하였으며, 점토질 이탄층이 지표면하 심도 10~34 cm 정도에 분포하고 있다. 달포늪에서 시추조사에 의해 채취된 퇴적물을 10 cm 간격으로 절단하여 유기물함량을 분석하였다. 습지A 퇴적물에서는 지표면하 심도 70 cm 정도까지 유기물함량이 40% 이상인 것으로 나타났으며, 습지C 퇴적물에서도 지표면하 심도 10 cm 정도까지는 습지A와 유사하였으나 지표면하 심도가 30 cm 이상인 깊이에서는 20% 이내의 유기물함량을 보였다. 습지B는 지표면하 부근에서의 유기물함량이 40% 정도로서 가장 낮게 나타났다. 3개 습지 모두 지표면에 근접한 점토질 이탄층에서의 유기물함량이 높게 나타났으며, 이는 점토질 이탄층의 입도가 세립질이며 또한 식생의 사체를 통해 유기물이 지속적으로 공급되기 때문이다. 달포늪 퇴적물의 유기물함량은 습지A > 습지C > 습지B의 순으로 나타났으며, 이는 퇴적물 내 점토질 이탄층의 형성 정도에 의한 것이다. 본 연구를 통해 달포늪 퇴적물의 유기물함량은 퇴적물의 입도와 상부 식생에 의해 지배되고 있음을 확인할 수 있었다.

• 한국유기농업학회지
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• 제18권1호
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• pp.21-40
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• 2010

This work is described as an fresh effort to study environmental sustainable management in organic products retailing markets. Sustainable management means creating value for business, nature and society. The main point of this thesis is about the concept, the content and the target of environmental sustainable management, and the technical method and basis to achieve it. Also this thesis shows the strategy of sustainable management as well as the realization of sustainable development by carrying out organic agricultural production. The main content of sustainable management is that: - Rationalize the utilization of resource and energy. - Maximize economic benefit. - Minimize harm to humans and the environment. Examines business strategies that have successfully targeted markets, such as advertising, labeling, gaining consumer trust, partnerships, and diversifying operations. These included management skills, and marketing organic and other sustainably grown products to determine strategies for developing new markets for these products. Suggests that consumers are becoming more aware of the importance of environmentally sound methods for growing food, the health benefits of wholesome food, and are willing to pay more for these products.

• 한국식생활문화학회지
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• 제4권2호
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• pp.177-179
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• 1989

This study was carried out to investigate the compositions of free sugars, lipids, and nonvolatile organic acids in parts of omija. The major components of free sugars in each part of omija were fructose and glucose. The contents of those were similar in fruits and endocarps, however, the content of glucose was 1.5 times as much as that of fructose in seeds. The content of lipids in endocarps was 2.4 times as much as that in seeds, and major composition of lipids was neutral lipid. In the contents of nonvolatile organic acids, the content of citric acid that content was 61 to 68% depend on each part of sample was highest among other components, and that of malic acid being 25 to 30% was followed. The contents of nonvolatile organic acids of water extract were 74.5, 55.9, and 69.2% as high as those of original sample in fruits, endocarps, and seeds, respectively. The content of oxalic acid in seeds was lower than that of it in original sample.

• Environmental Engineering Research
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• 제18권4호
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• pp.259-265
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• 2013

This study was conducted June 2011 at Gamo Lagoon, after tsunami of March 2011, to estimate food sources and utilization. The results show that the tsunami affected the sediment properties by changing the physical environmental alterations. The fatty acids of the gut content of Nuttallia olivacea mostly comprised the same organic matter found in the sediment. Fatty acids in the tissues showed mainly diatoms, bacteria, and dinoflagellates. That is, most of the food sources (i.e., diatoms, bacteria, dinoflagellates, macroalgae, and terrestrial organic matter) probably pass through the digestive system unharmed; however, terrestrial organic matter, which is refractory to biochemical degradation, indicated a different assimilation trend between the gut content and the tissue. This result suggests that input of labile organic matter from the sediment may control selective metabolism in N. olivacea. From these results, although the physical environment of sediment characteristics by tsunami changed, the food utilization of N. olivacea suggested a better assimilation of selected components from the gut content, irrespective of physical alteration.

• 한국환경농학회:학술대회논문집
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• 한국환경농학회 2011년도 30주년 정기총회 및 국제심포지엄
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• pp.188-195
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• 2011

Red lateritic soils are typically low in total organic carbon (TOC) and available phosphorus (AP) content and continuous fertilization is required to obtain desired crop yield. In this experiment, cattle manure in three forms (air-dried, composted and vermicomposted) were applied to red lateritic soil to study their effect on TOC and AP content of soil and probable mechanism of P-solubilization as affected by these treatments were also studied. Vermicompost was the most effective to solubilize insoluble P in red lateritic soil (Alfisols) as compared to other organic amendments (air-dried cattle manure and compost). The highest SPA in vermicompost-treated soil attributed to the comparatively higher concentration of all the three SPA isozymes in these soils. The maximum P-solubilization in these soils might be attributed to the highest SPA and presence of several organic acids like citric, lactic and oxalic acids in vermicompost-treated soils. Since, vermicompost application also increased TOC, mineralizable N and exchangeable K content of soil, vermicompost could be considered as the most rational organic amendment to improve chemical properties of red lateritic soils.

• 한국환경농학회지
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• 제30권1호
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• pp.1-8
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• 2011

BACKGROUND: With increasing public awareness to environment-friendly agriculture, many efforts have been run to develop organic farming technologies in Korea as of late 90s. The objective of this study was to investigate the effects of different organic farming practices on soil chemical properties and water quality in paddy fields. METHODS AND RESULTS: Total nitrogen (TN) and total phosphorus (TP) were monitored for a two-year period (2006 to 2007) from the study organic paddy fields located in Wan-ju, Jeonbuk Province in Korea. TN and TP of organic paddy water were gradually increased for 2~3 weeks after organic manure application and then gradually decreased afterward. The overall variation of TP in the paddy fields was much greater than that of TN. The phosphorus content in organic paddy field appeared to increase with the organic farming period. CONCLUSION(s): This indicates that long-term organic farming is likely to cause phosphorus accumulation in soils and increase vulnerability to rainfall runoff. Thus, appropriate phosphorus management needs to be implemented, particularly, to reduce excessive phosphorus supply owing to nitrogen-based determination of organic manure application amount.

• 대한환경공학회지
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• 제32권2호
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• pp.155-164
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• 2010

고기구이 스모크와 같은 바이오매스 소각에서 발생하는 스모크는 도시의 미세먼지중 유기성 탄소물질을 구성하는 주요 오염원이다. 미세먼지의 오염원 기여도를 산출하기 위한 화학수지모델(Chemical Mass Balance:CMB)에서는 배출원 오염물분포자료(Source Profile)가 필수이다. 바이오매스를 비롯한 고기구이 스모크의 오염물분포자료를 작성하기 위하여 유기성 지표물질들을 분석하였다. 고기구이에서 발생한 스모크를 PM10 채취기로 채취하여 용매추출, 유도체화반응, 중수소가 함유된 표준물질을 투입하여 Gas chromatography/Mass Spectrometry(GC/MS)로 팔미트산, 스테아르산, 올레인산과 같은 지방산과 콜레스테롤, 다환방향족탄화수소를 측정하였으며, 동시에 PM10 필터시료의 유기성(OC) 및 원소성 탄소(EC)를 OCEC 분석기에 의하여 측정하였다. 쇠고기구이 스모크로부터 채취한 PM10시료의 OC에서 콜레스테롤, 총포화지방산, 불포화지방산의 함량은 0.056 wt%, 2.727 wt%, 0.278 wt%이며, 돼지고기 구이 스모크로부터 채취한 PM10시료의 OC에서는 0.062 wt%, 2.022 wt%, 0.438 wt%를 차지하고 있었다. 쇠고기와 돼지고기 구이 스모크 OC에서 총 PAH화합물의 함량은 0.116 wt%와 0.044 wt% 이었는데, 그중에 단일 화합물로서 benzo(a)pyrene은 0.0071 wt%와 0.0023 wt%이었다. 콜레스테롤을 기준으로 각 지표물질의 무게 비율은 외국에서 발표된 고기구이 배출원 오염물분포자료와 거의 일치하여 유기성 에어로솔의 오염원 기여도를 산출하는 배출원 오염물분포자료로서 사용할 수 있음이 확인되었다.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2001년도 총회 및 춘계학술발표회
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• pp.140-143
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• 2001

The packed column experiments were conducted with commercial Jumunjin sand(SOM content : 0.01 %) and a field soil(SOM content : 0.08 %) in order to understand the effects of water content and soil organic matter(SOM) on the transport of gaseous ozone in unsaturated soil contaminated with phenanthrene. Water content and SOM content were artificially controlled. As water content increased, earlier breakthrough was observed in the beginning of BTC of ozone, because direct contact of gaseous ozone with SOM and phenanthrene was prevented by water film formed between soil particles and gaseous ozone. The total removal of phenanthrene in Jumunjin sand was not affected by water content which was more than 99% at different water content(4.4, 8, 17.3%). However, the removal in field soil at water content 6.5 % and 20 % was 98% and 80 %.

• Journal of Ginseng Research
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• 제9권1호
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• pp.36-41
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• 1985

The study was conducted to investigate the changes of soil physico-chemical properties between soils of preplanting fields and 2 years old ginseng fields, and compare the missing plant rate among the 2 years 016 ginseng fields. 1, The missing plant rate of 2 years old ginseng was high in sand loam while low in clay loam soil texture, soil porosity and NO3-N were remarkably increased in 2 years old ginseng field than preplanting soil, as the clay content was increased, soil porosity seemed to be increased but exchangeable nitrogen decreased. 2. The preplanting soil management methods did not significantly influenced on the missing plant rate and soil porosity in 2 years old ginseng fields, However NO3-N content and Fusarium density seemed to be decreased as the plow frequency was increased, exchangeable nitrogen content, whereas, seemed to be increased with more organic matter. 3. Differences of clay content (below 15% and above 20% of clay content) was significantly influenced on soil porosity, bulk density, total nitrogen, organic matter and P2O5 content. 4, Missing rate showed negative correlation with clay, soil moisture, and organic matter content but positive corelation with NO3-N in 2 years old ginseng fields.