• 생물환경조절학회지
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• 제8권3호
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• pp.183-191
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• 1999

순환식 담액수경 상추재배에서 양액의 pH 변화는 미량원소 수준에 관계없이 생육 중기에 낮아지다가 생육후반에 회복되었는데 양액 내에 Humus첨가에 의해 양액의 pH 변화가 완만해졌다. 생육은 Humus첨가에 의해 양호한 경향을 나타냈고 미량원소수준이 높아질수록 저조하여 Cu · Zn농도 5ppm이상에서 황화현상 등의 피해가 발생하였으며, Humus 첨가에 의해 중금속에 의한 생체중 감소가 현저히 억제되었으며 과잉피해증상이 완화되는 경향을 나타내었다. 무기성분 흡수에서는 Zn은 흡수억제 효과가 없었으나 Cu원소의 흡수는 억제되어 중금속의 피해 우려시 Humus의 효과가 어느 정도 인정된다.

• 한국환경농학회지
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• 제24권4호
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• pp.364-369
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• 2005

우리나라 최남단에 위치한 제주도에 가장 많이 분포하고 있는 화산회 밭 토양과 비화산회 밭 토양에 가축분 퇴비를 0, 50, 100, 150 ton/ha 해당량을 시용한 후 토양 부식의 함량 변화를 조사하여 문제점을 살펴본 결과는 다음과 같다. 부식의 분포도는 화산회 토양은 대부분 A type이었으며 일부 밭토양에서 B type에 속하여 화산회 토양은 부식화가 진행되었음을 알 수 있었으며 비화산회 밭토양은 대부분 Rp, B type으로 존재하여 동일한 결과를 얻을 수 없었다. 질산태 질소 함량과 부식함량과의 관계는 화산회 토양은 $R^2=0.5263$, 비화산회 양은 $R^2=0.524$의 정의 상관관계를 나타내었다. 탄소의 함량과 부식 함량과의 관계는 화산회 토양은 $R^2=0.469$, 비화산회 밭 토양은 $R^2=0.550$의 정의 상관관계를 보이고 있다.

• 한국생물환경조절학회:학술대회논문집
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• 한국생물환경조절학회 1998년도 임시총회 및 학술논문발표요지
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• pp.88-91
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• 1998

최근 급속한 산업발달로 인하여 환경오염이 날로 심화되고 있으며, 특히 재배적인 측면에서 토양이나 수질의 중금속오염 문제가 크게 우려되고 있다. 이 중 Cu와 Zn은 식물체의 탄수화물이나 단백질 합성 및 여러 가지 효소 작용에 필수적인 원소이지만 그 양이 과다하면 철 결핍 증상과 비슷한 잎의 황화(chlorosis)현상을 일으킨다. 한편, humus내에 함유되어 있는 humic acid는 양액에 첨가하면 다가의 양이온과 결합하여 난용성 염을 형성하고 (중략)

• 생물환경조절학회지
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• 제8권3호
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• pp.172-182
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• 1999

수경재배에서 양액의 재활용이 상추의 생육이나 수량에 어떠한 영향을 미치는지 알아보고자 Control, 양액보충, EC조절, 양액검정보정, 양액검정보정＋humus첨가 등의 5처리를 두어 실험을 수행한 결과는 다음과 같다. 양액의 pH에서 양액검정보정구와 양액 검정보정.＋Humus참가구가 4차재배까지 7.0이하로 안정된 경향을 나타내었고, EC는 양액보충구가 재배횟수가 늘어날수록 현저히 떨어졌고 다른 처리는 대조구와 유사한 경향이었다. 생육 및 수량은 양액검정보정 처리가 양액내 무기이온들의 균형으로 대조구와 유사한 경향을 나타내었으며 양액보충구 및 EC조절구는 재배횟수가 늘어날수록 떨어지는 경향이었다. 양액의 무기성분중 N $O_3$-N와 N $H_4$-N는 재배후 처리에 관계없이 농도가 크게 떨어졌고 특히 Ca과 Mg은 모든 처리구에서 재배횟수에 관계없이 재배전에 비해 재배 후에 양액내에 축적되는 경향을 보였다. 상추엽중 무기성분함량은 T-N와 P$_2$ $O_{5}$ 의 경우 1차재배후 양액검정보정＋Humus 첨가구에서 다른 처리에 비해 함량이 적었고 재배횟수가 늘어날수록 처리간에 차이가 없었다. K과 Mg은 재배횟수나 처리간에 차이가 없었고, Ca의 경우 양액검 정보정＋Humus 첨가구에서 1차와 2차재배 후 다소 많았으나, 재배횟수가 늘어날수록 처리간에 차이가 없었다.

• 대한화학회지
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• 제19권4호
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• pp.258-268
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• 1975

유기폐물을 다량으로 배출하는 산업중에서 대표적인 제지·펄프공업, 식품공업을 선택하여 고형유기폐물과 폐수처리오니의 합리적인 자원화 방법으로서 이들물질의 비료적 가치 및 humus원으로서의 개발가치를 중심으로 이들 물질의 물리적 및 화학적 특성을 조사한 결과이다. 제지${\cdot}$펄프공업 유기고형폐물은 비료성분이 적고 lignin 함량이 높아 비료로서 보다는 humus화하여 토양개량제로서 개발하는 것이 합리적이다. 제혁공업 폐수처리오니는 비료로서 효과도 기대되어 산성토양 개량효과도 기대되나 다량으로 함유한 Cr 으로 인해 오염효과가 문제가 된다. 식품공업의 고형 유기폐물 또는 폐수처리오니는 비료로서 또는 미량요소 공급원으로서 가치가 인정되며 수용성 당류의 량이 높거나 C/N율이 20이하로 낮은 물질은 속성 humus화를 위한 첨가 재료로서의 가치도 인정된다.

• 환경영향평가
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• 제7권2호
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• pp.5-14
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• 1998

This study was performed to estimate interrelation between characteristics of sediment and nutrient releare from sediment in Dae-cheong lake. For the investigations, sediments were sampled in June and October 1997 at fish farms, embayment, and the main stream of Dae-cheong lake. Items for investigation are as follows; water content, weight loss on ignition(IG), porosity of sediment, Total Kjeldahl Nitrogen(TKN), content of element(H, N, C), nutrient release rate. Water content and porosity were measured to conjecture the physical trait and grain size. And weight loss on ignition was measured to determine the contents of organic substance. For the determination of nutrient release rate, $PO_4-P$ and $NH_4-N$ concentration of interstitial water and overlying water were measured. Release rate of nutrients which has direct influenced upon the water quality were 0.05-8.63mg-$P/m^2{\cdot}day$ and 4.99-36.56mg-$N/m^2{\cdot}day$. And it was found that release rate was measured higher in the 1st sampling than in the 2nd sampling. And for determination of the humus level of sediment, carbon and nitrogen content were measured by using elemental analyzer. Generally, C/N ratio is used to determine humus level of lake sediment. As a result of elemental analysis, C/N ratio was determined in the range of 7.64~11.55, so humus level of Dae-cheong lake sediment was estimated from mesohumic state to oligohumic state.

• The Korean Journal of Ecology
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• 제8권2호
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• pp.81-87
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• 1985

The vegetation on the north and south slopes of Kwanak mountain was assessed and recorded during thesummer of 1976. Recordings were made of 5*5m quadrats placed along the transects running parallel to the slopes. On the north slope, most of large trees such as Alnus sibirica, Sorbus alnifolia, Robinia pseudo-acacia and Pinus rigida make the crown and their mean DBH was conspicuously large, while the vegetation of south slope is dominated by dwarf Juniperus utilis, Pinus densiflora, Weigela florida var. glabra which are considered as a resistant species of dry site. The amount of humus, total nitrogen, soil water content and available phosphorous is higher on the north slope than the south one. However, the soil pH is higher on the south slope. It is assumed that the humus content is a main factor to make difference on the type of vegetation between the north and south slope.

• The Korean Journal of Ecology
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• 제8권3호
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• pp.171-176
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• 1985

The structure of natural vegetation and soil condition in bog area of Woopo, Changnyeung, South Korea were observed. The vegetations in the investigated area could be classified into two groups; a typical bog vegetation with dominant species of Eleocharis mamillats, Acorus calamus and Persicaria hostatosagittata and the transitional vegetation of three neighboring areas. Interspecific correlation in the investigated area was very close. In the typical bog vegetatiion regions (region II, III, V, VI, VII, VIII and X) soil pH, field moisture capacity, available P content and exchangeable K were moderate. But, In the transitiional area I, with the highest humus content, field moisture capacity and exchangeable K Salix gracilistyla was dominant. In the region IV with the lowest humus and a ailable P content and with high soil pH Geophyta was a major component species. Also Acorus region IX with the lowest content of exchangeable K Therophyta was dominant and plant species was diverse due to weak water influence. The vegetation structure of the region IX was most different from that of the whole vegetation.

• Environmental Sciences Bulletin of The Korean Environmental Sciences Society
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• 제2권2호
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• pp.169-179
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• 1998

This paper was performed to estimate interrelations between humus level of sediments and nutrient release from sediments in Dae-cheong reservoir. For investigations, sediments were sampled in June and October, in 1997 at fish farms, embayment, and the main stream of Dae-cheong reservoir. Items for investigation are as follows; water content, weight loss on ignition(IG), porosities of sediments, contents of element such as hydrogen, nitrogen, carbon, and nutrient release rates. Water contents and porosities were measured to conjecture the physical trait and grain size trait. Weight loss on ignition was measured to determine the contents of organic substance. For determination of the humus level of sediments, carbon and nitrogen contents were measured by elemental analyzer. As a result of elemental analysis, C/N ratio was determined in the range of $3.0\~13.1$. From the elemental analysis, humus level of Dae-cheong reservoir sediment was estimated from mesohumic state to oligotrophic state. For the determination of nutrient release rate, $PO_4-P$ and $NH_4-N$ concentrations of interstitial water and overlying water were measured. By using the concentration difference between interstitial water and overlying water and using the Fick's diffusion law, the release rates of phosphorus and nitrogen from the sediment samples were calculated. Release rates of nutrients which directly influence to the water quality were $0.05\~8.63mgP/m^2day$ and $4.99\~36.56mgP/m^2day$. It was found that release rate was measured higher in the 1st sampling period than in the 2nd sampling period. For the determination of phosphorus content in sediment, TPs were measured in 807\~1542{\mu}g/g$ in the 1st samling period and $677\~5238{\mu}g/g$ in the End samling period. Phosphorus release rate and phosphorus content were not interrelated each other.

• 한국토양비료학회지
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• 제8권3호
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• pp.113-119
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• 1975

Volcanic Ash Soils are widely distributed in Jeju island, and constitute the important upland soils which are either presently being cultivated or are suitable for reclaiming. The characteristics of Volcanic Ash Soils according to data made available by previous studies in Jeju and the outside of the country are as following: The most conspicuous mineralogical property is the presence of amorphous mineral colloids. The colloids have large and highly reactive surface to which the common physical and chemical properties are related. Soils are low in bulk density and higher both in porosity and permeability. Accumulation of humus in the upper part of soil is found in great quantity. Cation exchange capacity is high mainly due to high humus content, but the absorbing intensity of ammonium and potassium is weaker than that of crystalline clays. The phosphate absorption coefficient is extremely high and deficiency of minor element may occur both crops and animals. Soils are densely populated with actinomycetes and anaerobic bacteria. Nitrification and activity of urease are distinctly stronger than that of non-Volcanic Ash Soils.