• Journal of Ecology and Environment
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• 제42권3호
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• pp.128-138
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• 2018

Background: This study investigated the variation of soil organic carbon in four land cover types: natural and mixed forest, cultivated land, Eucalyptus plantation and open bush land. The study was conducted in the Birr watershed of the upper Blue Nile ('Abbay') river basin. Methods: The data was subjected to a two-way of ANOVA analysis using the general linear model (GLM) procedures of SAS. Pairwise comparison method was also used to assess the mean difference of the land uses and depth levels depending on soil properties. Total of 148 soil samples were collected from two depth layers: 0-10 and 10-20 cm. Results: The results showed that overall mean soil organic carbon stock was higher under natural and mixed forest land use compared with other land use types and at all depths ($29.62{\pm}1.95Mg\;C\;ha^{-1}$), which was 36.14, 28.36, and 27.63% more than in cultivated land, open bush land, and Eucalyptus plantation, respectively. This could be due to greater inputs of vegetation and reduced decomposition of organic matter. On the other hand, the lowest soil organic carbon stock under cultivated land could be due to reduced inputs of organic matter and frequent tillage which encouraged oxidation of organic matter. Conclusions: Hence, carbon concentrations and stocks under natural and mixed forest and Eucalyptus plantation were higher than other land use types suggesting that two management strategies for improving soil conditions in the watershed: to maintain and preserve the forest in order to maintain carbon storage in the future and to recover abandoned crop land and degraded lands by establishing tree plantations to avoid overharvesting in natural forests.

• 한국환경생태학회지
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• 제16권3호
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• pp.249-260
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• 2002

서울과 같은 대도시의 농경지는 인간의 간섭이 끊임없이 이루어지는 준자연지역으로 생산성보다는 도시의 생물다양성보존 및 경관다양성을 통한 일반시민의 자연체험이라는 측면에서 관리.보호될 필요가 있다. 그러나 도시지역의 농경지는 개발용지로 토지이용이 전환되어 급속히 감소하고 있다. 본 연구에서는 서울시를 대상으로 농경지 패취의 시간변화에 따른 토지이용변화를 살펴보고 서울시 비오톱유형도에 근거한 농경지 패취를 분석하여 서울지역 농경지의 경관생태학적 구조와 특성을 파악하고, 이러한 분석결과를 토대로 생물다양성 증진을 위한 농경지 관리모델을 구상하는데 그 목적이 있다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.417-419
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• 2003

Based on the Chinese resource and environment database, and using the Landsat TM and ETM data acquired in 1990 and 2000 respectively, the spatial-temporal characteristics of land use/cover changes in the Dongting lake area of central China was analyzed. The result showed that cultivated land decreased by 0.57% of total cultivated land. Built -up land and water area expanded, with an increase of 8.97% and 0.43% respectively. 94 percent of the cropland decreased was changed into water (mostly to fishpond) and built-up areas. Land-use changed most quickly in cities, and the slowest in the north and east of the study area.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2008년도 학술발표회 논문집
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• pp.1300-1304
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• 2008

The fact that soil loss causing to increase muddy water and devastate an ecosystem has been appearing upon a hot social and environmental issues which should be solved. Soil losses are occurring in most agricultural areas with rainfall-induced runoff. It makes hydraulic structure unstable, causing environmental and economical problems because muddy water destroys ecosystem and causes intake water deterioration. One of three severe muddy water source areas in Soyanggang-dam watershed is Jawoon-ri region, located in Hongcheon county. In this area, many cash-crops are planted at illegally cultivated agricultural fields, which were virgin forest areas. The purpose of this study is to estimate soil loss with current land uses (including illegal cash-crop cultivation) and soil loss reduction with land use conversion from illegal cultivation back to forest. In this study, the Sediment Assessment Tool for Effective Erosion Control (SATEEC) ArcView GIS system was utilized to assess soil erosion. If the illegally cultivated agricultural areas are converted back to forest, it is expected to 17.42% reduction in soil loss. At the Jawoon-ri region, illegally cultivated agricultural areas located at over 30% and 15% slopes take 47.48 ha (30.83%) and 103.64 ha (67.29%) of illegally cultivated agricultural fields respectively. If all illegally cultivated agricultural fields are converted back to forest, it is expected that 17.41% of soil erosion and sediment reduction, 10.86% reduction with forest conversion from 30% sloping illegally agricultural fields, and 16.15% reduction with forest conversion from 15% sloping illegally agricultural fields. Therefore, illegally cultivated agricultural fields located at these sloping areas need to be first converted back to forest to maximize reductions in soil loss reduction and muddy water outflow from the Jawoon-ri regions.

• 한국잡초학회지
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• 제7권3호
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• pp.265-279
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• 1987

울릉도(鬱陵島)의 농경지(農耕地)와 농촌지주변(農村地周邊)에 발생(發生)하는 하계잡초(夏季雜草)를 조사(調査)하여 얻어진 결과(結果)를 요약(要約)해보면 다음과 같다. 1. 잡초(雜草) 42과(科) 140종(種)이 조사(調査)되었다. 2. 농경지(農耕地) 및 비농경지(非農耕地)에 우점(優占)하는 잡초종(雜草種)은 바랭이, 쇠비름, 여뀌, 씌뜨기, 쑥, 닭의장풀, 강아지풀 순(順)이며 특(特)히 농경지(農耕地)에 쇠뜨기가 많이 발생(發生)하였다. 3. 농경지(農耕地)에서는 26과(科) 60종(種)의 잡초(雜草)가 조사(調査)되었고 여뀌와 방동사니군락(群落)로 형성(形成)되어 있었다. 4. 악초재배지(樂草載培地)는 26과(科) 60종(種)의 잡초(雜草)가 조사(調査)되었고 여뀌, 비름, 큰방가지똥군락(群落)으로 구성(構成)되었고 여뀌와 비름군락(群落)사이에 비름과 별꽃이 추이대(推移帶)로서 군락변천과정(群落變遷過程)에 있었다. 5. 농경지주변(農耕地周邊)에서는 40과(科) 116종(種)의 잡초(雜草)가 조사(調査)되었고 개망초, 쇠비름 및 괭이밥군락(群落)이 형성(形成)되어 있었다. 6. 계곡(溪谷)에서는 34과(科) 94종(種)의 잡초(雜草)가 조사(調査)되었고 큰 방가지똥과 질경이군락(群落)으로 구성(構成)되어 있었다.

• 한국환경과학회지
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• 제15권11호
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• pp.1077-1086
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• 2006

This study aims at analyzing relationships between land use and habitat types of winter wildbirds to provide basic understanding of ecosystem for preservation and restoration of urban ecosystem in the future. The research area is Hanam City. Researches on land use types showed Hanam City had 79.1% of greenspace and openspace, but intensive urban development has been taking place in greenspace that is adjacent to urban districts. This has brought the problems of lack of greenspace in urban districts and damages to cultivated areas and grassland. A total of 61 and 8,642 populations of winter wildbird species were observed in research areas. Paradoxornis webbiann(16.91), Passer montanus(11.93), Pica pica(6.88) were dominant species. When they were divided according to habitat types, 20 species of interior species, 8 species of interior-edge generalist species, 12 species of edge species and 3 species of urban species were observed. When which land use type was mostly served as wildbirds habitats was examined, urban species(3 species and 290 populations) was a dominant species in urban districts while in greenspace and openspaece, water species(19species and 3,075 populations) including winter migratory birds was. Among greenspace and openspaece, edge species was dominant in forest while urban species was a dominant species in cultivated areas. This shows there is a need to improve diversity of wildbirds through restoration of cultivated areas in the central part of Hanam City.

• 한국작물학회지
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• 제64권2호
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• pp.109-126
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• 2019

새만금 간척지에서 적응 가능한 잡곡자원을 선발하기 위하여 조, 기장, 수수 등 3종의 잡곡 유전자원 84종을 수집하였다. 수집 자원을 간척지에서 재배하면서 적응성을 검정한 결과 수수의 간척지 적응성이 가장 우수하였다. 대표적인 생육 요소인 초장의 간척지/일반지 비율을 측정한 결과 수수가 0.82로 간척지에서도 일반지에 비하여 크게 떨어지지 않는 생육상황을 보이는 것으로 확인되었고 기장은 0.61, 조는 0.51 순이었다. 수수자원 중 우수한 간척지 적응성을 가진 유전자원으로 까만수수, 사탕대죽, 남풍찰 3종이 선발되었다. 사탕대죽은 간척지 수량 229.4 kg/10a로 간척지/일반지 수량 비율이 89.3%이었으며 까만수수는 227.4 kg/10a로 간척지/일반지 수량 비율 87.8%를 나타내었고 남풍찰은 간척지에서의 수량이 일반지 수량의 86.0%인 239.6 kg/10a로 우수한 간척지 적응성 자원으로 선발되었다. 선발자원의 내염성 정도를 구명하기 위하여 포트에서 천일염을 사용하여 염농도를 1.0%까지 처리하고 지상부 및 지하부 생육과 광합성 능력 등을 검정한 결과 사탕대죽, 남풍찰, 까만수수 모두 높은 내염 정도를 가진 것으로 확인되었으며 가장 강한 내염성을 가진 수수 자원은 사탕대죽이었다. 간척지 생산 수수 자원의 기능성 향상을 확인하기 위하여 폴리페놀과 플라보노이드 함량 그리고 유해 활성산소 제거능을 확인하였고 ${\alpha}$-glicosidase 억제 활성을 통하여 항당뇨 활성을 분석하였다. 기능성 분석 항목 모두에서 간척지 재배 생산물의 기능성이 일반지 생산물에 비하여 향상되는 것을 확인되었는데 항산화 성분인 폴리페놀은 간척지 재배 시 함량 증가율 범위가 2%~26%이었으며, 플라보노이드 함량은 8.5%~55.6%로 함량이 증가하였다. DPPH 소거능도 간척지 재배시 16.7%p~47.0%p 증가하여 유해 활성산소 제거능력도 향상되는 것을 알 수 있었다. ${\alpha}$-glicosidase 억제 활성도 선발자원별로 18.4%p~19.9%p 높아서 항당뇨 활성도 간척지 재배에서 증가하였다.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1993년도 Proceedings of International Conference for Agricultural Machinery and Process Engineering
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• pp.87-97
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• 1993

China has a big population(22% of the world) and small cultivated land( only 7% of the world). Agriculture is very important and it has solved the problem of people's eating and wearing, and now it is creating favourable conditions for the state modernization and people's comparatively well-off. Farm mechanization plays an role in agriculture and has primarily developed. But the development is complicated since the big rural labour force and the small per capita cultivated land. The development and features of farm mechanization in China was summarized and the future task and its countermeasure was discussed in this paper.

• 한국작물학회지
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• 제28권3호
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• pp.358-367
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• 1983

본 시험은 녹두재배기술의 기초자료를 얻기 위하여 녹두의 지상부 형질, 수량구성요소, 수량 및 종실성분 변화를 구명코자 숙전 및 개간전에 질소, 인산, 가리의 시비량을 달리하여 시험하였던 바 그 결과를 요약하면 다음과 같다. 1. 경태는 토양류형에 관계없이 식물체 중앙부인 제5절간 > 기부절간 > 상위부위인 제9절간 순으로 굵었으며 특히 제5절간은 3요소시용과 상관이 있었다. 2. 식물체 상위 4개 절위의 엽병각은 숙전에서보다 개간전에서 증대되었다. 3. LAI는 어는 생육시기에서나 숙전에서 높았다. 특히 3요소 시용 및 3요소＋퇴비시용구에서 높았으며 개간전에서는 인산의 효과가 현저하였다. 4. 개화후 20일의 LAI가 클수록 건물중 및 종실수량은 많아졌으며 NAR은 낮아졌다. 5. 숙전에서는 가리시용, 개간전에서는 인산시용에 의한 주당협수의 증가로 종실수량이 증가하였다. 6. 종실성분중 유지함량과 단백질함량과의 부의 상관이 있었다. 7. 종실수량에 크게 영향하는 것은 개체당 협수로서 협수와 종실수량과는 정의 상관이 인정되었다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.18-20
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• 2003

Land cover change detection is one of the most important trends in which remote sensing data could be used to assist strategists and the planners to decide the best land use policy. Two images of NOAA-AVHRR and SPOT vegetation acquired in November 1992 and 2002 were used to assess the changes of Agricultural lands in Egypt. A supervised classification together with two change images derived from classification result and NDVI were used to evaluate the trend and form of the change. It was found that agricultural areas increased by about 14.3 % during the study period in particular around the River Nile Delta and near the Northern Lakes of Egypt. The new cultivated lands were extracted mainly from the desert and from the salt marches areas. At the same time, parts of the agricultural lands were turned into non-cultivated land because of the urban expansion and soil degradation.