• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.31-31
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• 2015

토양수분은 일반적으로 시료를 채취하거나 현장에 설치된 다양한 센서를 통해 추정하지만 이는 시간과 비용이 많이 소모되기 ?문에 유역내의 공간적인 토양수분 분포를 추정하는데 상당한 어려움이 따른다. 토양수분뿐만 아니라 공간적인 대기현상, 토양수분, 식생현황 등을 관측하는데 대중적으로 사용되는 것이 위성 관측이며, 기본적으로는 위성에 탑재된 센서가 각 주파수대역에 따라 영상을 생성하면 이를 특정 알고리듬을 적용하여 원하는 값을 도출하게 된다. 토양수분 산정에 사용되는 대표적인 위성영상으로는 SMOS (Soil Moisture and Ocean Salinity), ARMS-E(Advanced Microwave Scanning Radiometer - Earth Observing System), ARMS2 (ARMS ver.2) 영상 등이 있으며, 이러한 위성은 해상도가 약 10 km ~ 40 km로 상당이 낮기 때문에 우리나라와 같이 면적이 좁고 지형이 복잡하며 다양한 토지피복이 밀집되어있는 곳에서는 기존 수문 연구에 응용할 수 있는 토양수분 공간지도 산정을 위해 상세화(Downscaling)과정이 필요하다고 판단된다. 따라서 본 연구에서는 ARMS2 토양수분 영상을 MODIS 영상의 식생지수(NDVI, Normalized Difference Vegetation Index), 알베도 및 온도를 활용하여 공간적으로 상세화된 토양 수분 지도를 작성하였고, 유역 내에서 실제 측정되고 있는 토양수분 관측값을 활용하여 상세화기법의 적용성을 검토하였다.

• Korean Journal of Environment and Ecology
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• v.29 no.5
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• pp.777-784
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• 2015

This study verified the correlations between vegetation factors, such as the number of individual species and species diversity, and soil factors in Chamaecyparis obtusa (CO) stands in Jeollanam-do. Also, the site environmental factors that affect the annual growth of CO ring width were analyzed. Positive correlations were found between the species diversity index and Cation Exchange Capacity (CEC), available phosphate, and exchangeable $K^+$ (P<0.01). In addition, strong positive correlations were also found between the number of species that appeared in the study site and CEC, available phosphorus, exchangeable $K^+$ and exchangeable $Mg^{2+}$ (P<0.01). Tree ring growth showed strong correlations with the nutrient holding capacity and fertility of soil, including available phosphate, exchangeable $K^+$, CEC, and electrical conductivity (P<0.01). The explanatory variables of tree ring growth in CO were composed of exchangeable $K^+$, organic matter content, and soil pH. The regression model had a high level of explanatory power, 74.4%. In this model, the annual growth of CO ring width increased when exchangeable $K^+$ and organic matter content were higher but decreased when soil pH was lower. According to the analysis, it is found that the annual growth of CO ring width was significantly affected by soil fertility, including available phosphate, exchangeable $K^+$, CEC, and electrical conductivity. In addition, the soil fertility of CO stands seems to be significantly affected by the supply of fallen leaves from the understory vegetation of CO.

• Korean Journal of Environment and Ecology
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• v.20 no.2
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• pp.235-258
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• 2006

The monitoring of vegetation and water quality before(2003), during(2004) and after(2005) the restoration work of Cheonggye Stream indicated that $BOD_5$ concentration before the project averaged 51.1mg/L and that both the inflow of water from Hang River and the funnel of subway station water into the stream lowered the $BOD_5$ to 3.3mg/L, improving its water quality to the third grade. Species of plants slightly increased from 121 to 132 after the restoration. Specifically, perennial plant comprised 35.6%, an increase from 24.8% recorded before the restoration. Phragmites communis and Zoysia japonica communities were observed as the introduction vegetation. However, Humulus japonicus and Erigeron canadensis communities, which were classified into the first grade according to the vegetation conservation classification, were found to be still prevailing though they were dominant community before the restoration, meaning that the ecological condition of plants had not changed very significantly. An the other hand the water quality of the reference reach was classified into the first grade based on $BOD_5$, which implies the water quality of the section was better than the project reaches. Besides the section had more diverse plant species which numbered 154, and furthermore, the rate of immigrated plants comprised 13% which was lower than 28.8% recorded by the project sections. The project reaches are considered to be inferior to the reference section in terms of ecological condition. The effectiveness of the stream restoration cannot be determined only by such short-term investigation as was conducted in this study, and it is considered that the effectiveness of the restoration of Cheonggye Stream can be determined only if investigations in other major factors are conducted over the long-term period.

• Proceedings of the KAIS Fall Conference
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• 2012.05a
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• pp.444-447
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• 2012

주차장에서 발생하는 비점오염을 저감하기 위한 대책이 필요할 것으로 전망됨에 따라 최적관리기법(Best Management Practices, BMP) 또는 저영향개발(Low Impact Development, LID)과 같은 관리방안을 적용하여 강우에 의해 발생되는 강우유출수와 비점오염물질을 동시에 저감하는 연구가 수행되고 있다. 기존 연구사례들에서는 대상유역에서 발생된 강우유출수에 대한 모니터링을 수행을 통해 얻은 자료를 이용하여 비점오염물질 배출량을 산정하였지만, 이러한 방법은 다양한 강우사상에 따른 유출량을 직접 산정할 수 없으며, 미계측 유역에 활용하는데 있어서는 제약이 따르는 한계를 가지고 있다. 본 연구에서는 강우유출수 개선모형으로 국내 외에서 강우유출수의 모의와 저감시설의 성능평가에 많이 사용되고 있는 MUSIC(Model for Urban Stormwater Improvement Conceptualization) 모형과 SWMM(Storm Water Management Model) 모형을 이용하여 주차장 BMP 설치에 따른 저감효과를 산정하기 위해 주차장에 적합한 대상 BMP(식생수로, 통로화분, 투수성 포장)을 선정하고, 이를 강우유출수 개선모형의 BMP 모듈을 통해 모의하여 저감효과를 산정하는 방법론을 제시하고자 한다. BMP별 저감효과는 통로화분, 투수성 포장, 식생수로 순으로 나타났으며, 모형의 초기우수현상 재현성이 BMP설치에 따른 저감효과에 큰 영향을 미치는 것으로 파악되었다.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2022.09a
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• pp.49-49
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• 2022

경기도 화성시 일대에서 미기록 침입외래식물인 서양전동싸리(Melilotus dentatus)를 발견하여 보고하고자 한다. 본 종은 아시아, 유럽 원산이며, 주로 경작지와 공원, 정원 등의 인공적인 환경에서 발견된다. 국내에서 발견된 서양전동싸리는 경작지 내 작물의 종자와 함께 국내로 유입된 것으로 추정되며, 농수로를 따라 인근 주변에서 약 15개체의 생육이 확인되었다. 국내 전동싸리속은 모두 외래식물로 현재 4종(M. suaveolens, M. albus, M. indicus, M. officianalis)이 보고되었으며 탁엽 기부가 엽병에 합착되고, 3출 우상복엽이며, 긴 총상화서, 난형 또는 난상타원형 열매를 가지는 공통된 형태적 특징으로 서양전동싸리와 혼동되기 쉽다. 그러나 본 종은 탁엽이 피침형이고, 소엽이 장타원형이며, 거치가 뚜렷하고, 배주가 2개이며, 종자의 색이 녹갈색인 특징으로 국내 근연 종들과 구분된다. 본 연구에서는 서양전동싸리의 실체와 생육환경을 확인하고, 그 결과를 바탕으로 형태학적 기재 및 화상자료를 비롯하여 주변식생 목록과종 식별을 위한 검색표를 제시하고자 한다.

• Korean Journal of Environment and Ecology
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• v.22 no.2
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• pp.83-97
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• 2008

This study was carried out to investigate the actual vegetation and Degree of Green Naturality(DGN) and distribution of exotic plants replanted in Bukhansan National Park. The actual vegetation of the surveyed site was classified into eight plant communities and crop land, etc. Substitutional forest were classified into five plant communities; Quercus mongolica community, Q. mongolica-Pinus densiflora community, Deciduous broadleaf forest, etc. Reforested lands were classified into three forest types: P. koraiensis forest, Robinia pseudoacacia forest, P. rigida forest, etc. The area of DGN 8 consisted of 92.80% in Bukhansan National Park. The replanted plants in Bukhansan National Park was enlisted as 212 taxa, 71 families. The indigenous native among the replanted species were enlisted as 67 taxa(31.6%), 37 families. The exotic plants were enlisted as 145 taxa(68.4%), 58 families. The exotic plants needs to management that for recovery of natural environment, improvement about maintenance of multiplicity and a site of scenery about natural plants in Bukhansan National Park.

• Journal of Korean Society of Forest Science
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• v.94 no.6
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• pp.462-467
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• 2005

This study aims to classify the biotope types and evaluate its functions for acquiring the basic information which can support the landscape ecological management of the urban forest in the case of the three parks in Daegu metropolitan city and then to analyze vegetation landscape patterns. The biotope classification was mostly divided into 5 to 6 biotope type groups in the high units and 15 to 20 biotope types belong to them and then could know that the more big the park size, the more diverse and large the biotope types and its average area. The biotope grade over the three parks was dominating low rank grade (1 to 3 grade) 72.7% that forest organism is inadequate as live, and high grade (7 to 9 grade) did not appear entirely. Most in Biotope function estimation were appeared less than the middle rank grade and biotope area is bigger, those grade rises and temperature could know that is fallen. Vegetation landscape patterns was very simple because only two kinds of Robinia pseudo-acacia and Quercus acutissima is appeared as the dominated landscape elements in all of the three parks. And also because average area of those elements is generally 1ha or so, there was much problems in consecutiveness of functional role as forest ecosystem component. Conclusively, Ecological landscape management need to improve Biotope diversity and functionality, and it secures ecological minimal area and space linkage.

• The Korean Journal of Ecology
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• v.24 no.5
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• pp.273-280
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• 2001

We investigated the flora and vegetation structure of exotic plants along stream geomorphology and disturbance factors in the riparian zone of Seunggi stream, Incheon. Total 53 exotic plant species were found in the riparian corridors of Seunggi stream. The percentage of exotics ranged from 25% to 33% of total species richness, and its mean value was 24% in the whole riparian area. The percentage of exotics reflected the vulnerability of riparian zones to plant invasions by disturbances, and it could be used as an indicator of riparian system dysfunction. The distinct distribution patterns of exotic plants did not found in the lateral topographic features of the stream. Invasion and proliferation of the exotic plants were somewhat remarkable at terraces and bank slopes of the stream. Among various disturbance factors, plowing and trampling were important on the invasion of exotic plant species of Seunggi stream.

• Proceedings of the Korea Water Resources Association Conference
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• 2020.06a
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• pp.54-54
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• 2020

본 연구에서는 제방의 세굴이나 붕괴를 방지하기 위해 바이오폴리머(Biopolymer) 기반 신소재를 활용한 흙 제방의 보강공법을 제시하였다. 바이오폴리머 기반 제방의 보강공법은 흙과 바이오폴리머를 소량만 섞어도 흙의 강도 증진시킴과 동시에 빗물에 대한 내침식성과 식생의 생장을 촉진하는 생태성도 뛰어나기 때문에 제방 사면을 보호할 수 있는 친환경적이고 효율적인 공법이다. 이에 안동하천연구센터는 실증실험을 통한 신소재 제방 보강공법의 안정성 검증을 목표로 2 건의 월류붕괴 실험을 수행하였다. 첫 번째는 흙 제방 조건(Case 1)이며, 두 번째는 바이오폴리머 혼합 토양을 사면에 도포한 후 식생이 활착된 조건(Case 2)이다. 제방 붕괴에 따른 수로 내 수위변화를 측정하기 위해 압력식 수위계를 설치하였으며, 영상분석을 위한 다수의 카메라 및 드론을 활용하여 실험의 전 과정을 실시간 촬영하였다. 또한, 제내지 측 사면을 대상으로 월류에 따른 붕괴 지연효과를 정량적으로 제시하기 위해 이미지 픽셀 변화 측정 기법을 통한 시간에 따른 표면 손실률을 산정하였다. 흙 제방과 신소재 처리 제방의 시간에 따른 표면손실률을 비교한 결과, Case 2의 사면손실률이 Case 1에 비해 약 1.5~2.3 배 지연되는 것을 확인하였다. 하지만 단일 조건만으로 실험군과 비교군의 붕괴지연 결과가 제방 성능을 평가함에 있어서 일반화될 수 없으므로 이러한 정량적 평가는 다소 한계가 있다. 향후 이러한 부족한 부분을 해결하기 위한 노력과 다양한 조건의 추가실험을 통한 계측 데이터 및 붕괴지연시간의 평균값을 도출하여 신소재 제방의 안정성을 평가하기 위한 타당한 결과를 도출할 예정이다.

• Journal of Life Science
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• v.25 no.3
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• pp.323-328
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• 2015

The study of microbial diversity and richness in soil samples from a volcanic island named Ulleungdo, located east of South Korea. The soil bacterial communities on the Ulleungdo were analyzed using pyrosequencing method based on 16S rRNA gene. There were 1,613 operational taxonomic units (OUT) form soil sample. From results of a BLASTN search against the EzTaxon-e database, the validated reads (obtained after sequence preprocessing) were almost all classified at the phylum level. Proteobacteria was the most dominant phylum with 48.28%, followed by acidobacteria (26.30%), actionbacteria (6.89%), Chloroflexi (4.58), Planctomycetes (4.56%), Nitrospirae (1.83%), Bacteroidetes (1.51%), Verrucomicrobia (1.48%), and Gemmatimonadetes (1.11%). α-proteobacteria was the most dominant class with 36.07% followed by Acidobacteria_c (10.65%), Solibacteres (10.64%), δ-proteobacteria (4.42%), γ-proteobacteria (4.29%), Planctomycetacia (4.16%), Actinobacteria_c (4.00%), Betaproteobacteria (3.50%), EU686603_c (2.97%), Ktedonobacteria (2.91%), Acidimicrobiia (1.32%), Verrucomicrobiae (1.27%), Gemmatimonadetes_c (1.11%), Sphingobacteria (1.09%), and GU444092_c (1.06%). Bradyrhizobiaceae was the most dominant family with 22.83% followed by Acidobacteriaceae (10.62%), EU445199_f (5.72%), Planctomycetaceae (4.03%), Solibacteraceae (3.63%), FM209092_f (3.58%), Steroidobacter_f (2.81%), EU686603_f (2.73%), Hyphomicrobiaceae (2.33%), Ktedonobacteraceae (1.75%), AF498716_f (1.46%), Rhizomicrobium_f (1.03%), and Mycobacteriaceae (1.01%). Differences in the diversity of bacterial communities have more to do with geography than the impact on environmental factors and also the type of vegetation seems to affect the diversity of bacterial communities.