• Journal of Forest and Environmental Science
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• 제32권2호
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• pp.129-139
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• 2016

Study was conducted to investigate tree diversity and its population and regeneration status in homegardens of upper Assam, Northeast India through field study by quadrat method. A total of 154 tree species have been recorded from 135 studied homegardens under 109 genera 53 families. Most of these species (79%) are indigenous to our country, while the rest (21%) arealiens (naturalized and cultivated exotics) by origin. Tree species richness per homegarden varies greatly in different homegardens and is ranged from 5 to 52 tree species with a mean of 22 ($SE{\pm}0.58$). A. malaccensis is the most dominant tree species in the studied homegardens contributed 34% of the total tree density of the documented trees. The tree density is much higher with 4,259 individuals $ha^{-1}$ but, basal area ($36.32m^2ha^{-1}$) is very less. Based on the number of individuals present, very rare species is accounted for 10%, rare species 39%, common species 19%, dominants 14% and predominant species 18% in the present study. The population density of 154 tree species is 4,259 (individuals $ha^{-1}$) for adults (>3.18 cm DBH), 5,902 (individuals $ha^{-1}$) for saplings and 38,164 (individuals $ha^{-1}$) for seedlings. The density of seedlings>saplings>adults represents good regeneration status of tree species in studied homegardens. The population structure study showed that about 8% tree species have good regeneration status, 9% have fair regeneration status, 48% have poor regeneration status and 34% tree species have no regeneration. Study suggests that research and development action is needed to stimulate regeneration of those tree species which having high importance value indices but showing poor or no regeneration. Based on present observation, it can be conclude that homegarden can emerge as an effective means for both economic well-being and biodiversity conservation in upper Assam, Northeast India.

• 한국산림과학회지
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• 제99권4호
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• pp.568-572
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• 2010

희귀수종 시로미(Empetrum nigrum var. japonicum K. Koch.)의 기내증식 방법을 구명하기 위해 당년생 신초를 재료로 증식에 미치는 배지염류, 싸이토키닌 효과와 기내발근에 미치는 배지 및 오옥신의 효과를 시험하였다. 액아 마디로부터의 줄기 유도는 WPM 배지가 MS 배지보다 양호한 반응을 나타냈다. WPM 배지의 염류농도에 따른 줄기유도는 뚜렷한 차이가 없었으나 기본배지에서 비교적 건전한 줄기가 유도되었다. 다경 유도에는 zeatin이 BA보다 효과적인 반면에 줄기 생장은 BA가 더 양호한 것으로 나타났다. 증식된 줄기로부터 기내 발근은 1/2MS 배지보다는 WPM 배지가 효과적인 것으로 나타났으며 5.0 mg/L IBA 처리 시 가장 높은 발근율을 보였다. 발근묘는 인공 배양토에서 4 주후 93% 이상이 활착되었다. 이상의 결과는 희귀종 시로미의 기내배양을 통한 증식 가능성을 보여주었다.

• 한국산림과학회지
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• 제86권2호
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• pp.167-176
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• 1997

희귀수종인 모감주나무(Koelreuteria paniculata Laxm.) 6개 자생 집단에 대해서 잎의 형태적 특성 및 식생개황을 조사하였으며, 동위효소 분석에 의한 유전변이를 조사하였다. Nested design에 의한 분산분석 결과 8가지 잎의 형태적 특성 모두에서 집단간 및 집단내 개체간에 고도의 통계적 유의성이 인정되었으며, 대부분 형질의 경우 총 분산 가운데 집단간 차지하는 비율이 집단내 개체가 차지하는 비율보다 큰 것으로 나타났다. 식생분석 결과 각 집단별로 출현한 수종 수는 많지 않았으며, 대부분 집단이 인위적 교란을 받고 있는 것으로 나타났다. 다른 수종, 특히 지리적으로 광범위하게 분포하는 수종들과 비교할 때 유전변이는 매우 적고(A/L= 1.1, P=9.5%, $H_o=0.021$, $H_e=0.035$) 집단간 분화($F_{ST}=0.114$)는 다소 큰 것으로 나타났는데, 유전적 부동 및 근친교배의 영향을 받고 있는 것으로 추정되었다. 마지막으로 모감주나무 집단의 유전적 다양성을 보전하기 위한 방법에 대해서 논의하였다.

• Journal of Forest and Environmental Science
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• 제35권3호
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• pp.159-172
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• 2019

Madhupur National Park (MNP) is one of the last remaining patches of old-growth natural Sal forest left in Bangladesh where the forest is tropical moist deciduous type. A study was revealed to assess the tree species diversity and composition in this area. For determining tree species the study was conducted through extensive random quadrat survey methods with $20m{\times}20m$ sized plots. Results of the study indicated that there were 139 tree species belonging to 100 genera and 40 families. The quadrat survey assessed the basal area, stem density, diversity indices and importance value index of the tree species having ${\geq}5cm$ D.B.H (Diameter at Brest Height). The basal area and stem density of the tree species were $20.689{\pm}1.08m^2/ha$ and $1412.93{\pm}64.27stem\;ha^{-1}$ while, diversity indices, i.e. Shannon-Wiener's diversity, Simpson's evenness, Margalef's species richness and Pielou's dominance indices indicated poor diversity in comparison to that of other PAs (Protected Areas) in South-Eastern region of Bangladesh. The structural composition based on height and D.B.H through reverse-J shaped curve indicated higher regeneration and recruitment but removal of trees of large growth classes. Sal (Shorea robusta) was the most dominant tree species that accounts 75% of the total tree individuals in the natural forest patches. However, some associates of Sal, i.e. Bhutum (Hymenodictyon orixensis), Gadila (Careya arborea), and Kusum (Schleichera oleosa) etc. were seemed to be rare in MNP.

• 환경생물
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• 제33권3호
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• pp.283-289
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• 2015

The bdelloids collected from various terrestrial habitats such as mosses, lichens, mushrooms on tree trunks, leaf litter and soil at four different locations in Korea were investigated. Five bdelloids new to Korea were identified: Macrotrachella inermis Donner, 1965, Macrotrachela magna Schulte, 1954, Macrotrachela oblita Donner, 1949, Habrotrocha eremita (Bryce, 1894) and Habrotrocha schultei Donner, 1965. All these rotifers except M. inermis are new to Asia as well. Remarkably, these five Korean new records included four rare species with poorly known distributions. M. magna and H. schultei are recorded outside their type localities for the first time. M. oblita has been reported only from five European countries, and M. inermis has been known from three European countries and Eastern Turkey before the present study. The taxonomy and distribution of each rare bdelloid are discussed here.

• Journal of Forest and Environmental Science
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• 제31권2호
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• pp.136-148
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• 2015

Hyangro-bong is located on the northern side of the civilian access control line and therefore has gone through natural ecological succession without human interference. Currently, it forms a distinctive natural ecosystem in which rare wild animals and plants are various. It is located in the Baekdudaegan mountain system and plays an ecologically important role as a bridge that connects the Geumgang mountain and Seorak mountain. This study investigated the flora of the eastern parts, Forest Genetic Resources Reserve Area, of Hyangro-bong. A total of 363 vascular plants that belonged to 77 families, 206 genera, 310 species, 3 subspecies, and 47 varieties were found in the study area. Rare and endangered plants identified in this study included the critically endangered Swertia wilfordii and endangered Irisuniflora var. caricina. Furthermore, 4 vulnerable species, Hanabusaya asiatica, Codonopsis pilosula, Leontopodium japonicum, and Taxus cuspidata, were found. A total of 7 families and 14 taxa including Aconitum pseudolaeve and Clematis fusca var. coreana were confirmed as endemic plants. Naturalized plants belonging to 4 families, 11 genera, and 13 species were distributed along the Hyangro-bong forest roads.

• Animal cells and systems
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• 제10권1호
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• pp.27-40
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• 2006

Tree of heaven (Ailanthus altissima Swingle) as an invasive alien plant, appeared usually in the disturbed locations such as road-side, incised slope, and trampling path-side. They appeared abundantly in the trampling pathside but they did not appear or were rare in the interior of forest. Density and importance value of tree of heaven were proportionate to the relative light intensity measured according to distance from the trampling path toward forest interior and closely related to the breadth of trampling path as well. They were associated with annual, other exotic species or ruderal plants well. Distributional pattern of mature trees of them in the study area and its surrounding environments implied that they were introduced intentionally. Size class distribution of them showed that they are in expansion and artificial interferences such as, installing physical training space and developing hiking course functioned as trigger factors in their invasion and expansion. The results support the facts known generally in relation to invasion and expansion of the invasive alien plants. In this viewpoint, we suggest a management plan that applies ecological restoration principles to address ecosystems infected with tree of heaven by restoring the integral feature of the degraded nature and conserving the remained nature more thoroughly.

• Journal of Plant Biotechnology
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• 제5권4호
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• pp.201-207
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• 2003

Tissue culture techniques arguably are an important approach for ex situ conservation of rare and endangered plant species. However, there is utmost importance on maintaining the genetic integrity of the introduced plants especially in tree species. To examine the genetic integrity of the micropropagated plants, we randomly screened few hardened plants of Syzygium travancoricum, a critically endangered tree taxon, using Randomly Amplified Polymorphic DNA (RAPD) markers. Twenty-three random. primers were tried and twenty-five polymorphic loci were identified. The dendrogram based on the Unweighted Pair-Group Method Arithmetic Average and Nei's similarity index depicted about 97% homology between the mother plants and micropropagated plants. Further, an attempt was made to reintroduce the micropropagated plants in the wild. Over three hundred small trees could be successfully established.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2019년도 춘계학술대회
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• pp.90-90
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• 2019

This study was carried out to investigate the vegetation and vegetation structure of Mt. Man in Hwacheon Gun from April to October 2018. The survey site is located in the northern part of South Korea where the climate is similar to that of North Korea. The purpose of this study is to provide basic information for efficient ecological forest management after unification. A total of 341 vascular plant taxa are recorded, representing 221 genera, 4 subspecies, 42 varieties and 6 forms in 84 families. Rare species, including Crataegus komarovii and Amitostigma gracile are found across 10 taxa; 8 families, 10 genera, 9 species, 1 variety. Naturalized Plants, including Ambrosia artemisiifolia and Erigeron annuus found across 11 taxa; 6 families, 10 genera, 11 species. Dominant tree species of the tree layer based on the highest importance values were: Quercus mongolica (23.47%), Larix kaempferi (11.43%), Fraxinus rhynchophylla (8.30%), in the subtree layer were: Lindera obtusiloba (11.38%), Acer pictum subsp. mono (11.33%), Fraxinus rhynchophylla (9.80%) and in the shrub layer were: Lindera obtusiloba (10.22%), Fraxinus rhynchophylla (8.43%), Rubus crataegifolius (8.00%), in the herb layer Pteridium aquilinum var. latiusculum (5.67%), Oplismenus undulatifolius (5.00%), Lysimachia clethroides (3.49%) respectively. The species diversity of Mt. Man was 1.1764 in the tree layer, 1.2403 in the subtree layer, 1.4135 in the shrub layer, and 1.7416 in the herb layer. In conclusion, if we utilize the flora and vegetation structure surveyed in Mt. Man, we can effectively manage the degraded forests with similar altitudes and climate zones in North Korea.

• 한국산림과학회지
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• 제90권4호
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• pp.437-444
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• 2001

이 연구는 인공신경망기법을 적용하여 적지적수를 판정할 수 있는 산림환경입지인자를 도출하고, 그들 인자 상호간의 관계를 분석하여 적지적수 판정방법을 제시하고자 수행되었다. 적지적수 선정을 위한 대상수종으로 5개의 주요 침엽수종(P. densiflora for. erecta, L. leptolepis, P. koraiensis, P. densiflora, P. thunbergil)을 선정하였다. 먼저 총 1,320개소의 표준지를 대상으로 각 수종별 지위지수가 높은 순으로 40개씩 추출하여 총 200개의 표준지를 선발하였다. 각각의 자료는 해당 표준지에 대한 13개 인자의 산림입지환경 정보를 보유하고 있다. 연구결과 인공신경망기법은 패턴분류에 의한 산림입지환경 조사 자료들의 전산정보처리에 매우 효과적인 것을 알 수 있었다. 이 기법을 적지적수 판정에 필요한 패턴의 유무 분석에 응용함으로써 적지적수 판정에 거의 영향을 미칠 수 없는 패턴을 소유하고 있거나, 불규칙한 양상의 패턴으로 인해 패턴분류 과정 자체를 교란할 수 있는 자료들을 선별하여 제거할 수 있었다. 그 외에 인공신경망기법은 입지인자 구성에 따라 적지적수 판정 적합도가 77.6%에서 91.8%까지 높게 나타남으로써 산림입지환경조사 자료를 토대로 하는 적지적수 판정에 매우 높은 잠재력을 보여주었다.