• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2006.04a
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• pp.293-296
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• 2006

본 연구에서는 Landsat 7 ETM+위성영상을 이용하여 제주도의 표면온도분포를 구하여 제주도의 식생 분포와 비교해 보았다. 계산결과 온도분포는 제주의 남쪽지역이 북쪽보다 약$3^{\circ}C$정도 높게 나타났으며, 이러한 온도분포로 인하여 제주도의 남쪽에는 활엽수가 북쪽보다 침엽수가 대체적으로 많이 분포하였으며, 나무의 성장과 관련된 나무목의 둘레가 대체적으로 굵게은 것으로 나타났다. 이러한 경향으로 보아 제주도의 경우 같은 고도의 남쪽과 북쪽의 온도분포가 다르게 나타나며, 이러한 영향으로 인해 한라산 식생분포특성이 달라지는 것으로 판단되었다.

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.608-612
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• 2006

산지사면에서의 토양침식량은 실제 유역을 빠져나가는 토사유출량과 같지 않다. 이는 토사가 이동하는 과정에서 지형적인 요인 등에 의해 퇴적되거나, 가중되는 유수에 의해 더 많은 토양이 침식될 수 있기 때문이다. 토사유출률(SDR)은 유역의 크기뿐만 아니라 지형, 기후, 토양, 식생피복, 토지이용도 등에 관계된다. 본 연구에서는 기후 특성인 강우크기에 따른 토사유출률의 변화를 분석하고자 하였다. 산불 이후 5년 동안 산지 소유역의 시험유역을 운영하여 유출 및 토사유출량을 실측하여 자료를 구축하였고, 이 유역에 산지지역의 토양침식 모형인 SEMMA을 적용하여 토양침식량을 산정하고 유역출구로 이송한 실제 토사유출량과 비교하였다. 5년 동안 SDR은 전반적으로 감소하고, 강우량, 강우강도, 강우에너지와 같은 강우사상의 크기에 따라 증가한다. SDR은 2001년에서 2002년까지 대부분 1.0 이상이고, 2005년에는 1.0을 초과하지 않으며, 강우특성 뿐만 아니라 식생피복, 산불시간경과 등의 인자에 의존한다.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2010.06a
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• pp.117-118
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• 2010

위성 주사 및 촬영자료는 지표면의 반사광을 다중분광 형태로 주사하여 기록된다. 그리나 각 밴드에 기록된 지표복사체의 반사치는 피복체의 분광특성만을 나타내기 보다는 태양고도 및 방위, 그리고 지형 등에 따른 방향성 영향이 포함되기 때문에 산림의 관리 및 이용을 위한 기초자료로 식생지수를 추정할 때에 오차의 범위를 넘어 오류가 발생한다. 따라서 동일 방향성 조건의 수종에 따른 고유 정규식생지수(Normalized Difference Vegetation Index, 이하 NDVI) 값을 구하기 위해서는 지형효과에 대한 보정이 필요하다. 본 연구에서는 QuickBird 다중분광(MS)자료 기반의 NDVI값을 사면향별로 분석하여 산림 NDVI의 방향성을 증명하였다.

• Journal of Korean Society on Water Environment
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• v.24 no.4
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• pp.499-503
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• 2008

In order to control the non-point source pollution, a vegetative filter strips (VFS) was set up and the site-monitoring was performed. The objective of this study is to investigate the influence of the plant coverage on treatment efficiency of total nitrogen (T-N) and total phosphorus (T-P) using vegetative filter strips. According to the results, it seemed that the treatment efficiencies of T-N and T-P were closely related with the plant coverage ratio. The results showed that treatment efficiency of T-P average 50% at higher than 50% of the plant coverage and 20~23% at lower than 50% of the plant coverage. Also, the treatment efficiency of T-N increased with the increase of the plant coverage ratio.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2016.11a
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• pp.221-222
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• 2016

습지는 생태자원의 보고로 다양한 생물종의 서식지를 제공하며, 습지 생태계는 어느 생태계보다 생산성이 높다. 습지는 잦은 수위변동으로 인해 습지의 식물은 수위의 영향을 많이 받는다. 따라서, 식물종의 특징과 최적의 생육환경과의 관계를 규명하기 위해 수위에 따른 식물의 서식환경을 분석해야 한다. 본 연구에서는 자연생태계가 잘 발달되어 있는 남한강의 비내섬 습지에 대해 유황분석을 하였고 유황에 따른 유량을 모의하였다. 모의된 유량과 HEC-RAS 모형을 이용하여 유황별 홍수위를 산정하였으며, RAS Mapper를 이용하여 침수심과 침수구역을 모의하였다. 이를 통해 침수심에 영향을 많이 받는 식물의 서식환경을 분석하였다. 버드나무군락은 침수가 발생하지 않는 지역 및 0~0.8m의 침수심, 물억새군락은 침수가 발생하지 않는 지역 및 0~0.4m의 침수심, 쑥-망초군락과 달뿌리풀군락은 0~0.4m의 침수심, 그리고 환삼덩굴군락은 0~0.8m의 침수심이 발생하는 지역에서 서식하는 것으로 분석되었다. 본 연구의 결과는 유황에 따른 침수심에 대한 식생서식환경을 분석한 것으로 식생을 고려한 인공습지 조성이나 하천설계에 있어 기초적인 자료가 될 것으로 기대된다.

• Asian Journal of Turfgrass Science
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• v.4 no.2
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• pp.133-144
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• 1990

This experiment was carried out to study the effect of pure nitrogen fertilization on botanical composition of grassland in 1987~ 1988 under practical conditions at the " Federal Institute for Agriculture in the Alps" in Austria. The application rates were 0, 30, 60, 90 and 120kg/ha/cut, the cutting regimes 3-, 4 , 5- and 6-cuts/year. The results were as follows: 1. Only PK fertilization resulted in higher botanical composition of Trifolium repens among legumes in grassland, which was increased by cutting frequency .2. Nitrogen fertilization on three-cut areas resulted in higher existence of generally valuable tall grasses such as Arrhenotherum elatius Trisetum flavescens and Dactylis glomerata . On the other hand, nitrogen fertilization on four-, five- and six-cut areas showed mainly Doctylis glomerato and Poa pratensis appearance. 3.For some cases, appearance of less valuable grasses, herbs and weeds such as Agropyron repens, Poa trivialis, Poa annua, Setoria viridis, Aegopodium podagra rio, Men landrium rubrum, Taraxacum officlnale, Achillea millefolium, Rorippa sylvestris and Polygonum ocleulare was *Bundesanstalt fur alpenlandische Landwirtschaft Gumpenstein(A-8952 Irdning, 6sterreich) increased on medium and high rates of N fertilized areas. 4.Reduction of sward density may also diminish the advantages of nitrogen fertilization and may be threatened by mainly high dressings of nitrogen combined with too late utilization of the sward. 5.Location altered the efficiency of nitrogen fertilization on botanical composition.mposition.

• Journal of Korean Society of Forest Science
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• v.102 no.3
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• pp.345-354
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• 2013

To understand the community structures of the vegetation of the beaches and coastal dunes of Seocheon-gun, Boryeong-si, Anmyeon-do, Taean-gun in Chungcheongnam-do and Buan-gun in Jeollabuk-do at the west coast of South Korea, a plant sociological vegetation survey was carried out to make a classification of correlation vegetation communities, a cluster analysis and an inorganic component analysis on the soil and plant body. Regarding the vegetation of the coastal dunes, plant communities were classified into 31 communities by correlation dominant species, and as a result of a cluster analysis on the vegetation communities, they were classified into five vegetation types such as Calystegia soldanella community, Rosa rugosa community, Imperata cylindrica community, Vitex tend community and Elymus mollis community. The soil pH was highest in Seocheon area ($7.54{\pm}1.18$) while lowest in Buan area ($6.29{\pm}2.15$), and regarding inorganic components, the nitrogen content was highest in Robinia while lowest in Imperata cylindrica. The soil PH of vegetation I was highest (8.23) among the five vegetation types, and the organic matter was lowest (71.58). As a result of CCA ordination analysis to examine the correlation among environmental factors, Calystegia soldanella community, Rosa rugosa community and Imperata cylindrica community among the five vegetation types were distributed while they were not affected by soil environmental elements, but Vitex tend community and Elymus mollis community were distributed mainly at the places with high $K^+$ content in the soil.

• Journal of The Korean Society of Grassland and Forage Science
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• v.30 no.4
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• pp.309-316
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• 2010

The performance of grass filter strips (GFS) in reducing $PO_4$-P concentrations and soil loss from the forage cropland was tested in an experiment on the 10% slope in Grassland and Forages Division, National Institute of Animal Science, Rural Development Administration (RDA) from October 2007 to September 2009. Forage cropland with rye-corn double cropping system receiving inorganic fertilizer or livestock manure (LM) were compared in a natural condition. The plots were hydrologically isolated in a randomized block layout of 3 treatments $\times$ 2 factors $\times$ 3 replicates. Main plots consisted of the length of GFS, such as $25\;m^2$ ($5{\times}5\;m$), $50m^2$ ($5{\times}10\;m$), $75m^2$ ($5{\times}15\;m$). Sub plots consisted of the type of LM, such as chemical fertilizer (CF), cattle manure (CM) and swine manure (SM). Concentrations of $PO_4$-P in surface runoff water were reduced as the length of GFS increased. Especially, GFS with 10 m and 15 m reduced $PO_4$-P concentrations significantly compared to that with 0 m (p<0.05). However, there was not significant different between $PO_4$-P concentrations of GFS with 10m and that of GFS with 15 m. Moreover, Soil loss in surface runoff water were reduced as the length of GFS increased. GFS with 15 m reduced soil loss significantly compared to that with 5 m and 10 m (p<0.05). The results from this study suggest GFS improve the removal and trapping $PO_4$-P and soil loss from forage cropland.

• Journal of The Korean Society of Grassland and Forage Science
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• v.36 no.2
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• pp.81-88
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• 2016

This study was conducted to find out the effects of Improvement of Botanical Composition Technology (IBCT) on the forage production and ecological characteristics in a Rumex acetosella-dominated hilly pasture in Pyeongchang, in a period from August 2013 to the end of growing season in October 2015. $2MT\;ha^{-1}$ limestone was applied in August 2013 and April 2014. Liming significantly increased soil pH from 4.69 to 5.47 and then the soil pH consistently hovered at 4.91~4.98. For every grazing time, plant height was found to be higher with the application of IBCT as compared with the control. After grazing, no significant difference in plant height was found between the IBCT group and the control. Changes in the botanical composition of grassland can be affected by a lot of circumstances, but application of IBCT decreased Rumex acetosella from 12% to 2%, while also increasing the proportion of pasture. In relation to the botanical composition of grass, orchardgrass and timothy showed the highest percentages throughout the whole study period. The proportion of Kentucky bluegrass increased over time while tall fescue steadily decreased. The totals for grazing days were 58 in 2014 and 55 in 2015. Average herbage dry matter intake was $7,848kg\;ha^{-1}$ in 2014 and $6,941kg\;ha^{-1}$ in 2015. Due to the application of IBCT, dry matter productivity showed a significant increase of 59% during the first grazing period in 2014 (3,437 kg ha and 5,460 kg ha in control and IBCT). In 2015, the total dry matter yield of the IBCT group was 51% greater than the control ($5,742kg\;ha^{-1}$ and $8,685kg\;ha^{-1}$ in control and IBCT). Under acidic soil conditions, red sorrel can grow more strongly than grasses because it has better tolerance in dry and acidic conditions. Therefore, constant management is required in order to keep red sorrel from dominating the hilly pasture. In this study, the application of IBCT was able to effectively control weeds at all points. As a result, total management, including improvement of soil, overseeding, and application of selective herbicide and fertilizer, is needed to maintain excellent grassland conditions due to the limiting effects of environmental factors on grassland productivity.

• Water for future
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• v.37 no.2
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• pp.90-97
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• 2004

하천에 대한 수문학적 모델링은 사용하는 자료의 질에 따라 그 결과가 크게 영향을 받는다는 것은 이미 알고 있는 사실이다. 여러 수문관련 연구에서 문제시되고 있는 것은 적절한 정확도로서 수문과정을 양적으로 표현하기에 충분한 자료가 없다는 것이다. 대유역에서 토지이용 및 기후변화에 따른 수문학적인 영향을 규명하기 위해서는 지형, 지질, 토양, 식생, 기상에 대한 자세한 정보가 없이는 불가능하다. 원격탐사기법이 발전되면서 다양한 센서로부터 대유역에 관련된 수문정보들을 획득할 수 있게 되었다. 원격탐사 자료를 최대한 활용하기 위해서는 수문관련 연구 및 모델에 이러한 자료들을 효과적으로 접합시키는 방법을 강구해야 한다(Peck 등, 1981; Rango, 1987; Schultz, 1988; Engman과 Gurney, 199k).(중략)