• 한국산림과학회지
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• 제95권6호
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• pp.723-728
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• 2006

산림천이는 비교적 장기간에 걸쳐서 진행되는 산림 구조와 기능의 변화 과정이므로 그 진행 과정에 대하여 모델 개발 혹은 통계적 방법을 통하여 객관성을 높일 수 있다. 본 연구는 점봉산 일대 천연활엽수림의 천이 진행 과정을 정량적으로 파악하기 위하여 수종의 극성상지수와 구성 비율로 산출되는 천이지수를 추정하였고, 천이의 진행에 따른 군집의 생활형 구성 비율의 차이와 종다양성의 차이에 대하여 검토하였다. 그 결과, 신갈나무-피나무군집의 천이지수가 67.5로 가장 높은 값을 보였고, 전나무-틀메나무군집이 67.4로 그 다음 순이었으며, 가래나무-층층나무군집이 60.5로 가장 낮은 값을 보였다. 신갈나무-피나무군집을 제외한 대부분 군집에서 미래의 안정상태의 상층 임관천이지수는 현재보다 증가하는 것으로 나타나 이 지역의 상층의 수종 구성은 현재 진행천이가 일어나고 있었고, 중층에서는 매체로 천이의 진행과 함께 천이지수가 증가하는 것으로 나타났으나 그 변화폭이 미미하여 중층과 하층의 천이 진척은 거의 동일 단계에 와 있음을 알 수 있었다. 천이지수의 값은 생활형 중 풍수산포형과는 유의수준 5%에서 부의 상관관계가 인정되었고, 동물산포형과는 정의 상관관계가 인정되었다. 천이지수와 교목, 관목, 초본 및 전체 종의 종풍부성 그러고 Shannon의 종다양성지수와는 상관관계가 인정되지 않았다.

• Journal of Ecology and Environment
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• 제46권3호
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• pp.204-217
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• 2022

Background: Increasing land demands for food production have led to biodiversity loss and land degradation in the Madhupur Sal forest. Reforestation activities such as agroforestry and woodlot plantation support the conservation of diversity, restoration of forest and prevention of soil erosion in degraded natural Sal forest. Knowing about these reforestation activities, this study is needed to compare the species composition, richness, and soil nutrients of these two plantation activities to the natural Sal forest in the degraded Madhupur Sal forest in Bangladesh. Results: The analysis showed that in between the reforestation activities, the highest Shannon-Wiener index (1.79), evenness (0.60) and Simpson's index (0.79) were found in the agroforestry site compared to the woodlot plantation site. On the contrary, the highest species richness (n = 14), tree basal area (19.56 m² ha^-1), Margalef's index (1.96) were recorded in woodlot plantation than in the agroforestry site. We observed that at 0-15 cm depth, soil organic matter (2.39%), total nitrogen (0.14%), available phosphorous (62.67 ㎍ g^-1) and exchangeable potassium (0.36 meq/100 g) in agroforestry plots were significantly higher compared to other forest sites. At topsoil (15-30 cm depth), soil organic matter (1.67%) and available phosphorous (21.09 ㎍ g^-1) were found to be higher in agroforestry site. Conclusions: Both reforestation approaches improved soil function, although woodlot plantation had the higher species richness. Therefore, plantation activities by the sustainable implementation of these two practices are the best alternative to restore the biodiversity, richness and conserve soil fertility in the Madhupur Sal forest of Bangladesh.

• Journal of the Korean Statistical Society
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• 제33권1호
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• pp.129-147
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• 2004

For square contingency tables with nominal categories, this paper proposes a measure to represent the degree of departure from the quasi-symmetry (QS) model and the Bradley-Terry (BT) model. The measure proposed is expressed by using the Cressie and Read (1984)'s power-divergence or Patil and Taillie (1982)'s diversity index. The measure lies between 0 and 1, and it is useful for comparing the degree of departure from QS or BT in several tables.

• Journal of the Korean Statistical Society
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• 제27권3호
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• pp.289-303
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• 1998

For square contingency tables with ordered categories, Tomizawa (1995) considered two kinds of measures to represent the degree of departure from global symmetry, which means that the probability that an observation will fall in one of cells in the upper-right triangle of square table is equal to the probability that the observation falls in one of cells in the lower-left triangle of it. This paper proposes a generalization of those measures. The proposed measure is expressed by using Cressie and Read's (1984) power divergence or Patil and Taillie's (1982) diversity index. Special cases of the proposed measure include TomiBawa's measures. The proposed measure would be useful for comparing the degree of departure from global symmetry in several tables.

• 한국산림과학회지
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• 제99권5호
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• pp.736-743
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• 2010

This study examined the ecological attributes of classified forest community by cluster analysis in the mixed forest of Mt. Seokbyung Experimental Forest of Gangwon-Do. The vegetation data were collected in randomly established 51 sample plots (2.04 ha) and analysis adopted the cluster analysis, importance value index, and Shannon's diversity index. Main results were as follows; 1) the study area was classified into 4 clusters (A, B, C and D). 2) The cluster A was dominated by Pinus densiflora with an importance value of 71.6%. The most dominant species in the cluster B and cluster C were Larix leptolepis (57.1%) and Quercus mongolica (40.2%), respectively. Finally, The cluster D was dominated by P. densiflora (30.6%) and Q. mongolica (31.0%) with the mixed forest. 3) In the P. densiflora community (cluster A), distribution of DBH class showed a reverse J-shaped curve. In the L. leptolepis community (cluster B), individuals of dominant species had the bell-shaped distribution. Oak species indicated uniform distribution of DBH class (under 25 cm) in the mixed P. densiflora - Q. mongolica community (cluster D). 4) The species diversity index of the communities in descending order were: Pinus densiflora - Q. mongolica community > Larix leptolepis community > Pinus densiflora community > Quercus mongolica community.

• 한국환경생태학회지
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• 제11권4호
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• pp.450-461
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• 1998

설악산국립공원 내설악에 위치하는 백담계곡 산림의 식물군집구조를 분석하기 위해 52개 조사구를 설정하고 연구를 수행하였다. DCA 분석결과 소나무군집, 낙엽활엽수혼효림, 졸참나무군집, 서어나무군집, 신갈나무군집으로 분리되었다. 졸참나무군집은 서어나무군집으로 천이가 진행될 것이며, 소나무군집, 낙엽활엽수혼효림, 신갈나무군집은 그대로 유지될것으로 예측되었다. 온대북부림지역인 본 연구대상지의 서어나무군집은 졸참나무군집에서 천이가 진행된 것으로 추측되었는데 이는 온대중부림의 전형적인 생태적 천이경향과 유사하였다. Shannon의 종다양도 경우 0.9827~1.2946(단위면적: 400m$^2$)으로서 우리 나라 다른 국립공원지역보다 비교적 높았다.

• 한국물환경학회지
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• 제31권6호
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• pp.610-618
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• 2015

This study was conducted to find out the influence of sample size (accumulated survey areas) on the seven biological indices of benthic macroinvertebrates. BMI, the index similar to Zeilika-Marvan’s saprobic index, tended to be independent on the variations of sample size. The other indices (Shannon-Weaver’s diversity, Margalef’s richness, Menhinick’s richness, Pielou’s evenness, and Lenat’s EPT index) showed the considerable variations along with the increase of sample size and environmental conditions. To get the appropriate index values, it should be sampled at least 6 replicates more based on 30×30cm Surber sampler. In addition, the habitat heterogeneity index of benthic macroinvertebrates suggested in this study, it will be able to be used for evaluating the heterogeneity of habitats.

• Journal of Forest and Environmental Science
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• 제32권3호
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• pp.291-301
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• 2016

One of the most concerned topics in ecology is the relationship between biodiversity and ecosystem functioning. However, there are few field studies, carried out in forests, although many studies have been done in controlled experiments in grasslands. In this paper, we describe the relationship pattern between three facets of diversity and productivity at Ratargul Fresh Water Swamp Forest (RFWSF) in Bangladesh, which is the only remaining fresh water swamp forest of the country. Sixty sample plots were selected from RFWSF and included six functional traits including leaf area (LA), specific leaf area (SLA), leaf dry matter content (LDMC), tree height, bark thickness and wood density. In analyzing TD, we used Shannon diversity and richness indices, functional diversity was measured by Rao's quadratic entropy (Rao 1982) and Faith's (1992) index was used for phylogenetic diversity (PD). It was found that, TD, FD and PD were positively related with productivity (basal area) due to resource use complementarity but surprisingly the best predictor of tree productivity was FD. The results contribute to the understanding the effects of biodiversity loss and it is essential for conservation decision-making and policy-making of Ratargul Fresh Water Swamp Forest.

• 한국자원식물학회지
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• 제26권5호
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• pp.619-627
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• 2013

꼬리말발도리(Deutzia paniculata Nakai)는 전 세계적으로 우리나라 경상남북도 일부지역에만 자생하는 매우 제한된 분포범위를 가지는 특산식물이다. 이러한 꼬리말발도리 집단의 유전적 다양성 및 구조를 조사하기 위해 5집단 155개체에 대한 ISSR(Inter Simple Sequence Repeat) 분석이 수행되었다. 총 6개의 ISSR 프라이머를 이용하여 31개의 증폭산물을 관찰하였으며, 집단 수준에서의 유전적 다양성의 평균은 SI(Shannon's information index)=0.429, h (Nei's genetic diversity)=0.271로, 매우 높은 수준으로 나타났다. 집단별로는 큰 차이는 없었지만 비교적 높은 개화율을 보이는 밀양, 양산 집단이 다른 집단에 비해 다소 높은 유전 다양성을 유지하고 있는 것으로 나타났다. AMOVA 분석 결과 전체 유전변이의 약 16%가 집단 간 차이에 기인하는 것으로 설명되었으며, 나머지 84%는 집단 내 개체간에 존재하는 것으로 나타났다. 이처럼 제한된 분포범위를 가지는 꼬리말발도리 집단에서 나타나는 높은 유전다양성과 집단간 낮은 유전적 분화율은 완전 타가수정하는 교배양식과 집단내 비교적 풍부한 개체수의 영향인 것으로 판단된다. 따라서 현재의 유전다양성을 유지할 수 있는 적절한 현지 내 보전대책 수립이 요구된다.

• Journal of Microbiology and Biotechnology
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• 제15권3호
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• pp.672-677
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• 2005

The standard reference collection of strains for E. coli, the ECOR collection, was analyzed by a genome-based typing method. Seventy-one ECOR strains were subjected to repetitive extragenic palindromic PCR genome fingerprinting with BOX primers (BOX-PCR). Using a similarity value of 0.8 or more after cluster analysis of BOX-PCR fingerprinting patterns to define the same genotypes, we identified 28 genotypes in the ECOR collection. Shannon's entropy-based diversity index was 3.07, and the incident-based coverage estimator indicated potentially 420 genotypes among E. coli populations. Chi-square test of goodness-of-fit showed statistically significant association between the genotypes defined by BOX-PCR fingerprinting and the groups previously defined by multi-locus enzyme electrophoresis. This study suggests that the diversification of E. coli strains in natural populations is actively ongoing, and rep-PCR fingerprinting is a convenient and reliable method to type E. coli strains for the purposes ranging from ecology to quarantine.ine.