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Vegetation Structure of Hovenia dulcis Community in South Korea
Yun, Chung-Weon,Lee, Byung-Chun The Ecological Society of Korea 2002 Journal of Ecology and Environment Vol.25 No.1
Objectives of this study are to make clear the vegetation structure of Hovenia dulcis community in the Korean Peninsula over ten mountains including 17 plots. The results were summarized as follows. Habitat of the community indicated that elevation ranged from 115 meter to 720 meter at the sea level, slope aspect in nearly all directions, bare rock from 0 to 90 percent, slope degree from 10$^{\circ}$ to 40$^{\circ}$, topography from valley to middle slope, the height of tree layer from 8m to 22m, the diameter at breast height from 12cm to 59cm and coverage from 65% to 95$\%$</TEX. Vegetation physiognomy was mainly represented by a valley species such as Comus controversa, Quercus serata, Carpinus cordata, Zelkova serrata, Torreya nucifera, Hovenia dulcis, Ulmus davidiana var. japonica, Quercus variabilis, Fagus crenata var. muftinevis, Acer takesimense, etc. Vegetation was largely divided into four types such as Sorbus alnifolia Type, Acer palmatum Type, H. dulcis typical Type and Acer takesimense Type. According to CCA, H. dulcis typical Type was positively correlated with disturbance, bare rock and altitude, S. alnifolia Type indicated a positive correlation with organic matter and A. takesimense Type showed a negative correlation with bare rock. Altitude and slope factors were significantly correlated on axes. Canopy profile of S. alnifolia Type was well developed, H. dulcis typical Type was open with about 55$\%$</TEX cover under layer and Acer takesimense Type indicated the lowest canopy height of tree layer In four Types. According to importance value, Hovenia dulcis, Comus kousa, Quercus variabilis, Corpus controversa, Lindera erythrocarpa, etc. indicated high value in the H. dulcis dominated plots, but in other plots, Carpinus cordata, Hovenia dulcis, Torreya nucifera, Quercus serrata, Acer mono, Comus controversa, etc. showed high value caused by the differences of the floristic composition between them.
윤충원 ( Chung Weon Yun ),고승연 ( Seung Yeon Ko ),한심희 ( Sim Hee Han ) 한국산림과학회 2013 한국산림과학회지 Vol.102 No.3
This study was conducted to investigate the population structure and dynamics of the Picea jezoensis stands which are located in Mt. Gyebangsan and surveyed from March to October 2012. Results showed that the diameter class distribution of P. jezoensis presented a reverse J-shaped distribution pattern with 32 trees less than 10cm DBH, 20 trees in 10~30 cm DBH, and 11 trees more than 30 cm DBH. It showed seedlings and saplings of P. jezoensis seem to prefer areas with more sun light or with open upper layer. It was also observed that P. jezoensis preferes areas with organic soils and abundant water such as areas around stumps. Also, occurrences of P. jezoensis stands were analyzed through annual mean radial growth of the trees. And the results showed that the growth naturally or artificially occurred approximately on the years 1854, 1915, 1918, 1993 and 2002 years. Most of the gap-makers were classified as standing dead type with 23 individuals (45.1%).
윤충원 ( Chung Weon Yun ),김혜진 ( Hye Jin Kim ),이병천 ( Byung Chun Lee ),신준환 ( Joon Hwan Shin ),양희문 ( Hee Moon Yang ),임종환 ( Jong Hwan Lim ) 한국임학회 2011 한국산림과학회지 Vol.100 No.3
본 연구는 우리나라의 산림식생에 대한 대표 군락유형 분류를 위하여 1993년부터 2009년까지 약 17년 동안 22개 산림지역에서 1,456개소의 식생자료를 수집하여 식물사회적으로 분석하였다. 그 결과, 4쌍의 대립종군이 나타났고 최상위 수준에서 신갈나무군강(class)이 분류되었다. 식생분류를 수행하기 위하여 4쌍의 대립종군 중에서 굴참나무군락형과 청시닥군락형을 기준으로 분석하여 총 10개의 식생단위로 분류되었다. 또한 각 식생단위는 지질, 기후, 지형 등의 환경인자에 의해 매우 높은 상호관계를 가지고 있었다. 따라서 우리나라 산림식생은 10개 군락단위와 7 개 생태형으로 정리되었다. This study was carried out phytosociological forest community analysis, the sampled dada were collected and studied by 1,456 plots from 1993 to 2009 for 17 years in the 22 mountain area of South Korea. Four opposed species groups were classified and 10 vegetation units were divided as a result of forest vegetation classification. The 10 units were closely correlated with major environmental factors such as geological features, climatic conditions, topographical configurations, and etc. Therefore the forest vegetation of South Korea could be conclusively abstracted by 10 vegetation units and 7 eco-types.
아까시나무 ( Robinia pseudoacacia L. ) 조림지에서 천이의 예측과 조림학적 제어
윤충원(Chung Weon Yun),오승환(Seung Hwan Oh),이준혁(Joon Hyouk Lee),주성현(Sung Hyun Joo),홍성천(Sung Cheon Hong) 한국산림과학회 1999 한국산림과학회지 Vol.88 No.2
To get ecological information necessary for the prediction on succession and the silvicultural control of the black locust(R. pseudoacacia) plantation, classification of vegetation unit. competition of major species, and succession were analyzed. The results were as follows. Vegetation units classified in R. pseudoacacia forest were Quercus variabilis community, Persicaria perfoliata community, Styrax japonica community, Acalypha australis community, Typical community. Species diversity indices showed significant difference among the vegetation units. As a result of stand ordination by CCA method, arrangement of stands on Axis Ⅰ was correlated significantly with altitude, sand, silt and available phosphorus contents, and that on Axis Ⅱ was with total nitrogen, exchangeable calcium and kalium contents. It was judged that R. pseudoacacia plantation would be replaced by the mixed forest including Quercus spp., Acer spp., and Prunus spp. etc., native to Korea with the progression of succession as the results of analyses on competition of major species and successional tendency in R. pseudoacacia plantation.
인접 임분의 종류 , 계층 구조 및 식생단위에 따른 아까시나무의 이입에 관한 연구
윤충원(Chung Weon Yun),오승환(Seung Hwan Oh),이영근(Young Geun Lee),홍성천(Sung Cheon Hong),김재헌(Jae Heun Kim) 한국산림과학회 2001 한국산림과학회지 Vol.90 No.3
This study was conducted to investigate the effects of adjacent stand on the invasion of Robinia pseudoacacia plantations. The results were as follows. 1) Robinia pseudoacacia tended to invade into all directions regardless of the kinds of adjacent stands. But it was estimated that the invasion of Robinia pseudoacacia into adjacent stands could be very difficult, if the layer structure of adjacent stands were well developed. Whereas, it was estimated that Robinia pseudoacacia more rapidly intruded into adjacent stands, if adjacent stands were opened and bared. 2) Robinia pseudoacacia tended to invade into all aspects regardless of the kinds of vegetation units in the adjacent stands. But the dominance class of Robinia pseudoacacia in the adjacent stands showed a little differences among the vegetation units. The dominance class of Robinia pseudoacacia in Quercus aliena community and Quercus serrata community showed low level as +∼2, while the dominance class of Pinus densiflora community, Pinus rigida community, Quercus variabilis community and Quercus acutissima community represented high level as 1∼4. Also the dominance class of Isodon inflexus subgroup among three subgroups of Pinus densiflora community showed the lowest level as + ∼2.
Weon, Jin Bae,Yun, Bo-Ra,Lee, Jiwoo,Eom, Min Rye,Kim, Ji Seon,Lee, Hyeon Yong,Park, Dong-Sik,Chung, Hee-Chul,Chung, Jae Youn,Ma, Choong Je Hindawi Publishing Corporation 2013 Evidence-based Complementary and Alternative Medic Vol.2013 No.-
<P><I>Codonopsis lanceolata</I> (Campanulaceae) have been traditionally used to treat lung inflammatory diseases, such as asthma, tonsillitis, and pharyngitis. The present study was performed to evaluate the cognitive-enhancing effects of steamed and fermented <I>C. lanceolata</I> in scopolamine-induced memory impairments in mice. Cognitive abilities were determined by the Morris water maze and passive avoidance tests. Mice orally received fermented <I>C. lanceolata</I> extract at doses of 100, 300, or 500 mg/kg body weight. Fermented <I>C. lanceolata</I> extract (500 mg/kg body weight, p.o.) significantly shortened the escape latency times that were increased by scopolamine on the 4th day of trial sessions in the Morris water maze task. In addition, it exerted longer step-through latency times than those of the scopolamine-treated group in the passive avoidance test. Furthermore, the neuroprotective effects of fermented <I>C. lanceolata</I> extract on glutamate-induced neurocytotoxicity were investigated in HT22 cells. Fermented <I>C. lanceolata</I> extract showed a relative protection ratio of 59.62% at 500 <I><I>μ</I></I>g/mL. In conclusion, fermented <I>C. lanceolata</I> extract ameliorated scopolamine-induced memory impairments, exerted neuroprotective effects, and improved activity compared to that found with original <I>C. lanceolata</I>. Further study will be required to investigate the mechanisms underlying this cognitive-enhancing activity.</P>
Yun, Dong-Jin,Kim, Seyun,Jung, Changhoon,Lee, Chang-Seok,Sohn, Hiesang,Won, Jung Yeon,Kim, Yong Su,Chung, JaeGwan,Heo, Sung,Kim, Seong Heon,Seol, Minsu,Shin, Weon Ho The Royal Society of Chemistry 2018 Physical chemistry chemical physics Vol.20 No.4
<P>Correction for ‘Direct characterization of graphene doping state by <I>in situ</I> photoemission spectroscopy with Ar gas cluster ion beam sputtering’ by Dong-Jin Yun <I>et al.</I>, <I>Phys. Chem. Chem. Phys.</I>, 2018, 20, 615-622.</P>