• The Korean Journal of Ecology
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• v.19 no.3
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• pp.223-230
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• 1996

Five measurements of species diversity (richness index, diversity index, evenness index, dominance index and species sequences-importance curve) and their relationships with sltitude, tree age and community type were studied in $T\v{o}gyusan$ National Park, Korea. Altitude and tree age were the major variables explaining the differences of species diversity in the whole forest. Species richness index, diversity index and evenness index of Quercus mongolica and Pinus densiflora communities were lower than those of Carpinus laxiflora, Q. serrata, Fraxinus mandshurica, Q. mongolica - P. densiflora communities than that in the other communities. The species sequence-importance curve of the forest communities in $T\v{o}gyusan$ coincided with the ideal curve calculated by the lognormal-distribution theory.

• The Korean Journal of Ecology
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• v.14 no.3
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• pp.257-271
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• 1991

Two types in the species-importance, one type of carpinus laxiflora, carpinus tschonoskii, quercus serrata, quercus grosseserrata and pnus densiflora community and another type of abeies koreana community classified by zurich-montpellier method, were recognized based on the data from 81 sample plots. The forme species sequence-importance curves were coincidred with the ideal curve calculated by preston's lognormal-distribution theory(1948), with small variations among five communities, and the latter with that of motomura's niche pre-emption hypothesis(1932). It seems that plant community classified by phytosociological method based on the unit concept coincide with the vegetation type recognized by species population analyse based on the continuum concept and the dominance-diversity reflrcts on the difference in the coenocline among their plant communities.

• Korean Journal of Environment and Ecology
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• v.13 no.3
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• pp.271-279
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• 1999

전라북도 장안산의 72군락 지점에서 식물사회학적 조사에 의하여 구분된 10개 군락. 즉 신갈나무 군락, 신갈나무-철쭉꽃 군락, 신갈나무-노린재나무 군락, 신갈나무-졸참나무 군락, 졸참나무 군락, 굴참나무 군락, 서어나무 군락, 물푸레나무 군락, 층층나무 군락, 들메나무 군락에서 풍부도지수, 이질성지수, 균등도지수, 우점도지수를 산출하여 고도, 토양 특성 및 우점종군에 따른 종다양성의 변활르 분석하였으며 종서열-중요치 곡선을 이용하여 각 식물의 우점서열을 결정하고 각 종이 식물군락 내의 자원을 어떻게 분배하고 있는가를 결정하였다 고도, 토양요인(pH, base) 및 우점종의 차이는 삼림의 종 다양성에 영향을 미치는 중요한 변수로서 작용하였으며 우점종군에 따른 다양성의 변화는 지형과 교란에 의하여 영향을 받았다 종서열-중요치 곡선에서 조사된 10개 군락은 대수정규분포에 접근하고 있어서 군락간 약간의 차이는 있지만 대체적으로 어떤 특정 종이 군집 내 자원 공간을 독점하지 않고 적절히 분배하여 사용하고 있었다.

• Journal of Microbiology and Biotechnology
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• v.22 no.9
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• pp.1185-1192
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• 2012

This study investigated the hydrocarbonoclastic microbial community present on weathered crude oil and their ability to degrade weathered oil in seawater obtained from the Gulf St. Vincent (SA, Australia). Examination of the native seawater communities capable of utilizing hydrocarbon as the sole carbon source identified a maximum recovery of just $6.6{\times}10^1\;CFU/ml$, with these values dramatically increased in the weathered oil, reaching $4.1{\times}10^4\;CFU/ml$. The weathered oil (dominated by > $C_{30}$ fractions; $750,000{\pm}150,000mg/l$) was subject to an 8 week laboratory-based degradation microcosm study. By day 56, the natural inoculums degraded the soluble hydrocarbons (initial concentrations $3,400{\pm}700mg/l$ and $1,700{\pm}340mg/l$ for the control and seawater, respectively) to below detectable levels, and biodegradation of the residual oil reached 62% ($254,000{\pm}40,000mg/l$) and 66% ($285,000{\pm}45,000mg/l$) in the control and seawater sources, respectively. In addition, the residual oil gas chromatogram profiles changed with the presence of short and intermediate hydrocarbon chains. 16S rDNA DGGE sequence analysis revealed species affiliated with the genera Roseobacter, Alteromonas, Yeosuana aromativorans, and Pseudomonas, renowned oil-degrading organisms previously thought to be associated with the environment where the oil contaminated rather than also being present in the contaminating oil. This study highlights the importance of microbiological techniques for isolation and characterisation, coupled with molecular techniques for identification, in understanding the role and function of native oil communities.