• 한국환경복원기술학회지
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• 제13권6호
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• pp.173-184
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• 2010

This study was conducted to establish a management plan for the Sangrim Woodlands restoration by analyzing the vegetation survey and the site characteristics of the Sangrim Woodlands Natural Monument (Natural Monument 154) in Hamyang-Gun, Gyoungsangnam-Do, Korea. According to the vegetation analysis, the species diversity by the location of Sangrim was higher near forest (1.000) than near urban (0.358) areas. Although forest occupied 53% of the Sangrim woodlands area, it is still insufficient, requiring to transform arable land, lawn, or house areas to the forest within the woodlands. Soil bulk density was increased in access areas frequently used by public, while it was decreased in closed areas. Soil hardness at 0-10 cm soil depth was generally improved in the closed areas, while became worse in the public access areas compared with the soil hardness in 2004.

• 원예과학기술지
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• 제18권1호
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• pp.39-50
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• 2000

Asia has 60% of the world population and only about 34.5% of the world arable land. However, Asians traditionally consume very large amount of horticultural produce and depend heavily on vegetables for the sources of horticultural food crop. The vegetable production in Asia is highly intensive and multiple and successive cropping are routinely practiced. Concomitant with the rapid economic growth in many east Asian countries, the demands for high-quality horticultural crop have been drastically increased among many Asians and their interest in high-quality products, outstanding cultivars, machinery and equipment, production technology has been sharply increased in recent years. It is therefore believed that establishing and maintaining closer and regular relations among scientists and societies could provide an excellent momentum for promotion of horticulture on a global basis and both the ISHS and the ASHS could play decisive roles for this kind of promotion.

• Current Research on Agriculture and Life Sciences
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• 제14권
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• pp.37-47
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• 1996

The main objectives of this studies are to present the most desirable rice processing complex model system in a given our situations by comparision and analyzing the major factors and, also recommend the future prospect of the rice processing complex in Korea. There are 3 different rice processing complex models in Korea. Those are concrete bin, flat type steel bin and square bin. These systems have a lot of differences and have their own characteristics such as capital requirement, efficiency, storage capacity and quality controls. The major problems of the existing rice processing centers in Korea are high fixed cost and the unbalnced systems. Following is summary to solve this problems: 1. Development of the large scale harvester and high speed continuous dryer. 2. Quality inspective system of bulk grain and large scale temporary storage facilities. 3. Large size readjustment of arable land. 4. Select the convenient location of rice processing center and formulation of well equipment facilities.

• 식물분류학회지
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• 제53권3호
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• pp.222-229
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• 2023

Ipomoea heptaphylla Sweet and Murdannia nudiflora (L.) Brenan have been discovered on arable land on Jejudo Island, Korea. Ipomoea heptaphylla can easily be distinguished from other Korean Ipomoea species by certain distinctive features, which include thin and coiled long pedicels, small corollas, and, most importantly, palmatisect leaves with five to seven lobes. Murdannia nudiflora is characterized by the absence of a rhizome, the presence of caducous bracteoles, by its bearing of more than one flower, and by its fruits with two seeds per valve and foveolate-reticulate seeds, distinguishing it from M. keisak. In this study, we report the plants I. heptaphylla and M. nudiflora and provide their morphological descriptions, photographs, distribution, and keys.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2020년도 춘계학술대회
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• pp.15-15
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• 2020

Commelina caroliniana Water, was founded in Jongdal-ri (Gujwa-eup, Jeju Island) for the first time, is widely distributed arable land near the coast and roads. C. caroliniana belongs to Commelinaceae and native to Bangladesh, India. This species can be distinguished from its allied species in Korea by several characters as followings: apex acuminate and obovate shape spathes, flowers have blue 3 petals, maroon spot on the antherode, fruit with 5 seeds in 3 ovaries. C. caroliniana is well known for its strong fertility, which can outcompate native grasses and further negatively effect on the grassland ecosystem. The species has already introduced and widely distributed across much of southeastern US and some of Asian countries. Considering the case of C. caroliniana's diffusion capacity and influence on the ecosystem, management system for prevent their spreading are required through monitoring. Given the great potential of spread found in C. caroliniana, continuous monitoring may be required.

• 대한원격탐사학회지
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• 제22권6호
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• pp.553-563
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• 2006

본 연구의 목적은 MODIS 다중시기영상과 선형분광혼합화소분석(Linear Spectral Mixture Analysis : LSMA)을 이용하여 한반도의 토지피복도를 작성하는 것이다. 다양한 공간해상도와 광역적인 촬영스케일의 MODIS 영상에 LSMA를 이용하여 토지피복분류기 정확도의 향상과 한반도 생물계절적인 특성을 분석하고자 하였다. LSMA는 하나의 화소를 단일의 지표물로 가정하여 영상을 처리하는 기존의 기법과 달리 대상지의 토지피복 특성을 가장 잘 반영하는 순수한 물체의 화소값(Endmember)을 선택하여 자연환경요소들의 하나하나를 분리하는 기법이다. 본 연구에서 MODIS 다중시기 영상에 LSMA를 적용한 결과 남, 북한의 농경지 및 산림지역에 대한 서로 다른 생물계절적인 특성을 파악 할 수 있었으며, 이러한 결과 영상을 ISODATA 무감독분류기법을 통해서 대분류와 중분류하였다. 대분류에서는 79.94%의 전체 정확도를 보였으며, 농업지역은 85.45%, 산림지역은 88.12%로 다른 분류군들에 비해서 가장 높은 정확도를 보였다. 중분류에서는 산림지역과, 농업지역을 더욱 세분화하여 분류하였다. 전체정확도는 82.09%였으며, 활엽수림 86.96%, 논 85.38%로 분류군중 가장 높은 정확도를 나타냈다.

• 한국농림기상학회지
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• 제8권4호
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• pp.242-249
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• 2006

육상생태계에 나타날 수 있는 기후변화의 영향을 평가하기 위해 생태계모형의 사용이 보편화되고 있다. 작물생육모형의 경우 포장단위로 적용할 수 있으므로 기후변화정보만 적절한 공간단위로 제공된다면 경관규모에서 상세한 공간변화를 예측할 수 있다. 경기북부지역은 청정환경과 함께 고품질 콩 재배에 알맞는 기후지대이지만 기후변화에 의해 이 지역 내 콩 재배단지가 어떤 영향을 받을지 궁금하다. 향후 100년간(2011-2100) 예상되는 기후조건에서 선발된 10ha 이상 규모의 342개 단지를 대상으로 CROPGRO-Soybean에 의해 조중만생 콩 품종의 생육을 모의하였다. 이를 위해 3개 기후학적 평년(2011-2040, 2041-2070, 2071-2100)에 대해 월별 30m 격자형 기후변화 자료로부터 각 재배단지의 일 최고 및 최저 기온, 강수량, 강수일수, 일사량을 추출하고, 각 평년별로 일기상자료를 통계학적 방법에 의해 무작위로 30년치씩 생성하였다. 미래 3개 평년의 기상자료에 의해 생육모형을 구동하여 342개 재배단지의 생장, 발육, 수량특성을 모의한 결과 온난화가 진행될수록 콩의 개화기와 성숙기가 단축되며, 전체적인 생육기간은 $7{\sim}9$일 정도 줄어들었다. 수량은 조중생종의 경우 온난화에 따라 $1{\sim}15%$ 정도 감소하였는데 반해 만생종은 증가 후 감소하였다. 그 결과 현존하는 재배구역의 남북간 생산성 차이가 미래에는 크게 감소하거나 품종에 따라 역전되는 현상이 기대된다.

• 한국지역지리학회지
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• 제3권2호
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• pp.37-87
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• 1997

만경강유역을 하나의 연장선상에 놓고 연구한 결과, 그 공간상에서 역사와 더불어 형성발달해온 시공연속체를 확인할 수 있었다. 만경강상류에서 하류 하구연안에 이르는 면장공간상에서의 개간과정은 여말에서 부터 시작되어 오늘에 이른 것으로 볼 수 있다. [기원지-지향지] 지향가설에서 본 개간과정에서 개간의 기원지는 만경강상류 산간계곡의 지류곡지 개간을 효시로 하여 기원지가 이루어지고, 조선조 중기까지는 수방대책의 발달과 더불어 하천 중류까지 진출하고, 하천 본류에 대한 하류지역의 계간은 하천의 규모와 유수량의 증가로 인한 하안의 홍수와 범람을 극복할 수 있는 인공제방을 축조할 수 있는 기술수준에 이른 1920년대에 들어서야 본격화되고, 그후 연이어 하구연안의 간석지 개간도 시행되어 개간의 개척첨단이 이들 지향지인 해안간석지일대에 형성되는 것을 볼 수 있다. 시간의 흐름과 더불어 각 시기마다 공간의 변화도 수반되어 시공연속체가 발달하는 것을 볼 수 있다. 취락의 경우 개간과정에 따라 산간계곡 산록일대에서는 주변입지적 집촌, 하천중류와 하류에서는 중앙입지적 집촌, 하천하구 간석지에서는 중앙입지적 열촌형태가 우세하게 나타났다.

• 한국토양비료학회지
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• 제46권5호
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• pp.333-342
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• 2013

Soil compaction is affected by soil texture, organic matter (OM), strength (ST) and soil moisture, which is difficult to understand the degree and effects of related factors. The purpose of the study is to assess the impact of them on the compaction with bulk density (BD). The analysis was conducted with data collected from national-wide monitoring sites including 105 upland soils, 246 orchard soils, and 408 paddy soils between 2009 and 2012. The distributions of soil physical properties were measured. The correlation and multi linear regression analysis were performed between soil physical properties using SAS. The regression equation of BD(y) includes ST, gravitational water contents (GWC), and OM as variables commonly, having additional factors, clay content and sand content in paddy soil and upland soil for only subsoil (p<0.001). Our results show that the BD could be explained about 40~50% by various physical properties. The regression was mainly determined by ST in orchard and upland soil and by the GWC in paddy soil. To mitigate soil compaction, it is important to maintain the proper level of OM in upland soil and to consider the moisture condition with soil texture in paddy soil when making work plan. Furthermore, it would be recommended the management criteria classified by soil texture for the paddy soils.

• Carbon letters
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• 제26권
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• pp.66-73
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• 2018

We assessed the effects of combining bio-char with straw residue mulching on the loss of soil soluble nutrients and citrus yield in sloping land. The two-year study showed that straw residue mulching (ST) and bio-char application combined with straw residue (ST+BC) can significantly reduce soil soluble nutrient loss when compared with the control treatment (CK). The comparative volume of the soil surface runoff after each of the treatments was as follows: CK > ST > ST + BC. Compared with the CK, the runoff volume of the ST was reduced by 13.6 % and 8.5 % in 2014 and 2015, respectively. Compared with the CK, combining bio-char with the ST application reduced the loss of soluble nitrogen and improved the soil total nitrogen content reaching a significant level in 2015. It dramatically increased the soil organic matter content over the two year period (36.3% in 2014, 50.6% in 2015) as well as the carbon/nitrogen ratio (C/N) (16.6% in 2014 and 39.3% in 2015). Straw mulching combined with bio-char showed a trend for increasing the citrus yield.