• 한국농림기상학회지
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• 제14권4호
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• pp.236-245
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• 2012

제주지역에 도입된 편백 18가계의 초기 생장부터 현재(42년생) 까지의 연령별 수고, 흉고직경, 재적생장을 분석하였다. Yako-7, Muei-1, Sangsong-9 가계가 우수한 생장을 하였으며, Sangeun-3, Yago-6, Hyena-2 가계의 생장이 저조한 것으로 나타났다. 연령별 평균생장을 분석한 결과, 수고생장은 9년생에서 15년생 사이의 생장이 다른 연령대에 비해 우수하였으며, 흉고직경의 생장은 특별한 경향이 관찰되지 않았다. 수고, 흉고직경, 재적의 가계유전력은 각각 0.68, 0.75, 0.75로 추정되었으며, 연령간의 생장을 비교한 결과, 유노상관 관계는 없는 것으로 판명되었다.

• Journal of Forest and Environmental Science
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• 제38권2호
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• pp.90-101
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• 2022

The study aims to assess composition, diversity and population indices of natural regeneration of woody species in Jebel El Gerrie forest reserve, Blue Nile State, Sudan. We conducted field work between December 2018 and January 2019. We used random sampling to collect vegetation data in the forest where we made a total of 90 circular sample plots (radius 17.84 m) and distributed them proportionally to the area of each of the four density-based vegetation classes of the forest i.e. high density (C1), medium density (C2), low density (C3) and crop land (C4). In each sample plot we identified all regenerating tree species and counted their regeneration frequencies. We calculated ecological metrics of regeneration frequency, density, abundance, richness, evenness, diversity and importance value index (IVI) and drew abundance rank curve. Results revealed that out of fifteen mature tree species present, natural regeneration of 8 species, which belong to 6 families, was observed. The relatively most frequently naturally regenerating and abundant species were Anogeissus leiocarpa and Combretum hartmannianum. Richness, evenness and diversity of regenerating species were 1.33, 0.82 and 1.7, respectively. One-way ANOVA (α=0.05) of mean regeneration densities disclosed that there were significant differences (F_3,86=16.77, p=0.000) between C2 & C3 (p=0.000) and C2 & C4 (p=0.000). While regeneration of seven tree species were absent, two, two and four species were of good, poor and fair regeneration status, respectively. A comparison of mean density of natural regeneration with that of parent trees reflects a poor regeneration status of the forest. The study provides empirical results on the regeneration status of species and signifies the need for management interventions for species conservation and restoration, maintenance of biodiversity and sustainable production.

• Journal of the Korean Wood Science and Technology
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• 제50권4호
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• pp.272-282
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• 2022

The essential oil extracted from Citrus × natsudaidai (Yu. Tanaka) Hayata peels is known to have various biological properties. However, the chemical composition of essential oil is influenced by the ripening stages of fruits, which then affects related biological activities. This study investigates the antioxidant activities of essential oils extracted from Citrus × natsudaidai peels at different ripening stages (immature, mature, and overripe). The essential oils were extracted using the hydro-distillation method. As a result of gas chromatography-mass spectrometry (GC-MS) analysis, d-limonene was dominant and was increased as matured. However, 𝛄-terpinene was decreased. The antioxidant properties and their total phenolic content (TPC) were influenced by the ripening stages. The TPC was highest in the immature stage of essential oil (1,011.25 ± 57.15 mg GAE/100 g). 2,2-Diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity was excellent in the immature stage (EC₅₀ = 15.91 ± 0.38 mg/mL). 2,2'-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radical scavenging activity was superior in overripe stage (EC₅₀ = 20.43 ± 0.37 mg/mL). The antioxidant activity measured using ferric reducing antioxidant power (FRAP) assay showed higher values for the essential oils in immaturity (1,342.37 ± 71.07 mg Fe²⁺/100 g). Comprehensively, the essential oil in the immature stage showed the best antioxidant activity. Finally, knowing the chemical composition and antioxidant activity at different ripening stages will provide data for selecting the right fruit.

• 한국산림과학회지
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• 제97권5호
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• pp.547-551
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• 2008

The study aimed to develop a cryopreservation method for long-term storage using mature somatic embryo of Japanese larch. In this study, desiccation treatments significantly affected re-induction rates of embryogenic tissue (ET) from dried somatic embryos. In the effect of different dehydration temperature and duration on the re-initiation ET. the highest frequency was shown when somatic embryos were dehydrated at $25^{\circ}C$ for 2 (45.5%) or 1 day (43.3%), respectively. In addition, low temperatures [$4^{\circ}C$, 2 days (44.2%) or 3 days (43.5%)] were marked higher ET initiation. After that, the initiation value was declined with dehydration duration. For comparison of different relative humidity on re-induction frequency of ET, the best re-induction (43.5%) was obtained from somatic embryos pre-dried at $(NH_4)_2SO_4$ (RH 79%). Both $Na_2HPO_4$ (RH 97%) and $Na_2CO_3$ (RH 88%) treatments were showed the similar rate, 34.6, 34.2%, respectively. However the lowest rate (19.6%) was observed in distilled water (RH 100%). In comparison of the various storage temperatures and duration of the dried somatic embryos, the highest frequency (66.9%) of re-initiation was obtained when somatic embryos were cryopreserved for one day. However, the frequency was gradually decreased as the time length of storage increased regardless of types of storage. None of ET re-initiated when stored at $4^{\circ}C$ for 1, 2 and 84 days.

• Mycobiology
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• 제42권2호
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• pp.210-214
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• 2014

In Korea, mass mortality of Quercus mongolica trees has become obvious since 2004. Raffaelea quercus-mongolicae is believed to be a causal fungus contributing the mortality. To evaluate the pathogenicity of the fungus to the trees, the fungus was multiple- and single-inoculated to the seedlings and twigs of the mature trees, respectively. In both the inoculations, the fungus was reisolated from more than 50% of inoculated twigs and seedlings. In the single inoculations, proportions of the transverse area of non-conductive sapwood at inoculation points and vertical lengths of discoloration expanded from the points were significantly different between the inoculation treatment and the control. In the multiple inoculations, no mortality was confirmed among the seedlings examined. These results showed that R. quercus-mongolicae can colonize sapwood, contribute to sapwood discoloration and disrupt sap flows around inoculation sites of Q. mongolica, although the pathogenicity of the fungus was not proven.

• 한국산림과학회지
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• 제3권1호
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• pp.36-42
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• 1963

본조사(本調査)의 내용(內容)을 다음과 같이 적요(摘要)한다. 1. 1960년(年) 및 1961년(年) 양년(兩年)에 걸쳐 전남(全南) 광양군(光陽群) 옥용면(玉龍面) 추동(秋洞)에 식재(植栽)되고 있는 율림(栗林)에 대(對)해서 개화기(開花期) (시작(始作) 및 완료기(完了期)), 낙화기(落花期)(시작기(始作期), 완료기(完了期)) 및 과실(果實)의 성숙기(成熟期)를 조사(調査)한 내용(內容)을 보고(報告)한다. 2. 각품종(各品種)은 대체(大體)로 약(約) 26년생(年生)으로서 비교적(比較的) 토층(土層)이 깊은 갈색토(褐色土)에 생육중(生育中)인 것이다. 3. 평균(平均) 개화기(開花期)는 년도(年度)에 따라 유의적(有意的)인 차이(差異)가 없었다. 조기개화(早期開花)가 된 것에는 풍다마조생(豊多摩早生)(5월(月) 22일(日)), 대정조생(大正早生), 천견조생(淺見早生), 매평조생등(梅平早生等)이 있고 늦은 것에는 금북(今北), 마론데리아, 장광사(長光寺), 순천(順天) 109호(號), 미농(美濃), 내산(內山), 안근(岸根), 방토율(傍土栗), 상피(霜被), 장병위(長兵衛), 대전(袋田), 고금(古錦), 정월(正月), 편산(片山), 후락(後落), 옥성율(玉城栗), 소서율(小西栗)이 있다. 4. 낙화기(落花期)의 조만(早晩)은 개화기(開花期)의 그것과 대체(大體)로 정(正)의 상관(相關)을 갖이고 있었다. 개화상태(開花狀態)는 약 10~12일(日) 계속된다. 5. 개화기(開花期)(또는 낙화기(落花期))는 견과(堅果) 성국기(成熟期)에 직선적(直線的) 상관(相關)을 가지고 있음이 밝혀졌다. 6. 소립종(小粒種)의 대표(代表)는 을종(乙宗), 방토율(傍土栗)이 있고 풍은(豊銀), 편산(片山), 대원조생(大原早生)은 대립종(大粒種)에 해당한다.

• Journal of Forest and Environmental Science
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• 제34권1호
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• pp.31-45
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• 2018

At present the biodiversity of the riparian forest is under threat due to various anthropogenic pressures. Hence study was conducted along the three unprotected zones of riparian forest in Dikhu river, Nagaland, north-east India in order to compared the diversity, distribution and population structure of riparian trees. In each zone $100{\times}100m^2$ plot were marked and subdivided into 20 plots of $10{\times}10m^2$. 10 plots on each side of the river were taken randomly covering 0.02 ha. Only tree with dbh ${\geq}10cm$ and dbh above 1.5 m above ground level were recorded as individual species. A total of 29 tree species belonging to 18 families were recorded from the three zones of the river. Tree species richness was highest at the middle zone (19) followed by upper (14) and lower zone (7). The most abundant species and family recorded at upper, middle and lower zones were Melia azaderach of Euphorbiaceae ($380\;stems\;ha^{-1}$), Terminalia chebula of Euphorbiaceae ($432.5\;stems\;ha^{-1}$) and Duabanga grandiflora of Lythraceae ($365\;stems\;ha^{-1}$) respectively. The ranges of diversity indices observed in the three zones were: Shannon-Wiener index (1.25-0.73), Simpson diversity index (0.42-0.93), Evenness index (0.47-0.37) and Index of co-dominance (0.75-0.94). Rest of other indices were also estimated and compared. Distribution of trees shows the contagious pattern common in the upper and middle zones and regular in the lower zone. The girth size class analysis demonstrated that the riparian forest is in less mature succession stage. This study emphasize the need for management and conservation of riparian forest by developing policy to declare the riparian zone as protected area to prevent further degradation and loss of biodiversity from these unregulated zones along the river.

• 한국산림과학회지
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• 제108권1호
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• pp.21-28
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• 2019

This study was conducted to determine the carbon (C) and nitrogen (N) response of litterfall components as affected by N addition in compound fertilizer in a Korean red pine (Pinus densiflora S. et Z.) stand in southern Korea. Litterfall in a mature red pine stand was collected for two years following compound fertilizer application ($N_3P_4K_1$; $P_4K_1$) and no fertilization (control). The C concentration of litterfall components was not significantly (P > 0.05) different between the $N_3P_4K_1$ and the control plots, whereas the N concentration of the litterfall components was significantly higher in the $N_3P_4K_1$ plot than in the control plot. The $N_3P_4K_1$ and $P_4K_1$ additions induced a lower C/N ratio of litterfall components compared with the control plot. Annual C and N fluxes via litterfall components were not affected by the $N_3P_4K_1$ addition over the study period, except for reproduction litter. Annual N fluxes via reproduction litter were significantly higher in the $N_3P_4K_1$ plot than in the control plot. Thus, the $N_3P_4K_1$ and $P_4K_1$ additions could modify differently nutrient distribution of the forest floor and mineral soils in a red pine stand. These results indicate that N concentration and C/N ratio in litterfall components are more susceptible to fertilizer application than the C response in litterfall components.

• Animal cells and systems
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• 제16권2호
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• pp.162-171
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• 2012

We investigated food webs of a $Salix$ $subfragilis$-dominated wetland in the Janghang wetland in the Hangang estuary, which is very close to the Demilitarized Zone, along the west coast of Korea. Our study focused on understanding sesarmine crab ($Sesarma$ $dehaani$)-related food webs in a $S.$ $subfragilis$ forest. For our study, we used carbon and nitrogen stable isotopes and fatty acid biomarkers. We collected samples of plants, animals, and detrital sediment from four quadrats ($5{\times}5m^2$) set in the $S.$ $subfragilis$ community. Samples were collected from September 2006 to June 2009, except during the winter hibernation period of $S.$ $dehaani$. In the wet season, the sediment showed relatively high ${\delta}^{13}C$ and low ${\delta}^{15}N$ signatures compared with relatively low ${\delta}13C$ and high ${\delta}15N$ signatures in the dry season. Mature $S.$ $dehaani$ appeared to feed on fresh leaves and other carbon sources, such as immature individuals or fish, in addition to detrital sediment, which appeared to be the main carbon source for immature crabs. Principal component analysis of fatty acid biomarkers of $S.$ $dehaani$ showed a clear difference between immature individuals (10-30 mm) and mature ones (larger than 30 mm), indicating that the main food source for immature crabs was detrital sediment, whereas mature crabs foraged plants in addition to consuming detrital sediment. On the basis of our results from stable isotope and fatty acid analyses, mature $S.$ $dehaani$ appeared to feed on detrital sediment and fresh leaves of $S.$ $subfragilis$ in summer in addition to engaging in cannibalism of immature individuals.

• 식물분류학회지
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• 제43권2호
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• pp.128-138
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• 2013

특산식물 금강초롱꽃의 국제단위 IUCN 적색목록의 평가를 시도하기 위해, GIS를 이용하여 분포도를 작성하고 분포면적과 점유면적을 계산하였다. 2011년과 2012년, 2년간 현장조사를 한 결과 성숙개체는 4개 지역에서 269개체(2011년), 3개 지역에서 216개체(2012)를 확인하였는데, 기존 알려진 20여개의 서식지를 고려한다면 전체 성숙개체는 1,000개체 이상으로 추정된다. 분포면적은 12,742 $km^2$, 점유면적은 76 $km^2$이고 추정되는 성숙개체 수에 근거한 평가 결과, 금강초롱꽃은 위기종(EN)으로 판정되었다. 국내 희귀식물의 보전지위 평가에 있어 IUCN 국제평가기준을 적용시키기 어려웠던 이유는 국내의 생물학적 정보 확보 노력의 부족과, IUCN 범주 및 기준의 낮은 이해도 때문인 것으로 판단한다. 개별 종의 정확한 보전지위 평가를 위해서는 개체군 생태학적 정보를 축적해야 하며, IUCN 평가 절차를 준수해야 한다.