• Journal of Korean Society of Forest Science
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• v.79 no.4
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• pp.431-434
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• 1990

The growth pattern of bud-shoot-needle of isolated 15-year-old trees, and seansonal changes in litter-falls and fine root dry weights in the unthinned 28-year-old plantation were investigated to understand the growth phenology of Pinus koraiensis. Shoot growth was continued by 7th June when buds appeared, while current needle growth was by 19th July when the bud growth started. Most of the litter-falls occurred in October but many of them were fallen in July and August due to storms, Fine roots were produced mostly in autumn(1,004 kg/ha), and were dead during winter (583 kg/ha) and spring(1,331 kg/ha).

• Korean Journal of Environment and Ecology
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• v.26 no.3
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• pp.426-436
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• 2012

This study was carried out to investigate actual vegetation, the structure of plant community, and ecological succession sere of coastal forest ecosystem in warm temperate climate zone, Taejongdae, Busan City, Korea to provide the basic data for planning of the forest management. As a result of analysis of actual vegetation, vegetation types divided into 35 types, and the area of survey site was $1,750,461m^2$. The ratio of vegetation type dominated by Pinus thunbergii was 80.7%, dominated by Quercus spp. was just 5.0%, and dominated by Carpinus tschonoskii was just 0.4%. Eighteen plots(size is $20m{\times}20m$) were set up and the results analyzed by DCA which is one of the ordination technique showed that the plant communities were divided into four groups which are community I(P. thunbergii community), community II(P. thunbergii-Quercus serrata community), community III(Q. serrata-P. thunbergii community), and community IV(Carpinus tschonoskii-P. thunbergii community). The age of community I was from 38 to 59 years old, that of community II was from 35 to 71 years old, that of community III was from 37 to 53 years old, that of community IV was from 50 to 72 years old, thus we supposed that the age of the study site is about from 38 to 72 years old. We supposed that the successional sere of the study site is in the early stage of ecological succession in the warm temperate climate zone. The dominant species will be changed from P. thunbergii to Q. serrata or Carpinus tschonoskii in the canopy layer, on the other hand, Eurya japonica will be dominant species in the understory layer, and E. japonica and Trachelospermum asiaticum var. intermediumwill be dominant species in the shrub layer for a while. According to the index of Shnnon's diversity(unit: $400m^2$), community I ranged from 0.8640 to 1.3986, community II was from 0.1731 to 1.1885, community III was from 0.8250 to 1.0042, and community IV was from 0.3436 to 0.6986.

• Korean Journal of Environment and Ecology
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• v.33 no.3
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• pp.266-279
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• 2019

We investigated the characteristics of fish communities and habitat status of endangered species Rhodeus pseudosericeus in Heuk Stream, a tributary of the Han River, from April to October 2018. During this period, we collected 47 species of 14 families from 10 survey stations using kick nets, cast nets, and long bag set nets. The dominant and subdominant species were Zacco platypus (37.6%) and Z. koreanus (13.8%), respectively. The next most abundant species were Squalidus gracilis majimae (11.1%), Pungtungia herzi (7.7%), Rhodeus pseudosericeus (5.0%), Microphysogobio yaluensis (4.3%), and Hemibarbus longirostris (3.0%). Among the fish collected, 19 species (40.4%) were Korean endemic species. Endangered species were R. pseudosericeus and Acheilognathus signifer while exotic species were Micropterus salmoides and Oncorhynchus mykiss, and land-locked species were Plecoglossus altivelis and Rhinogobius brunneus. The community analysis showed that the dominance and evenness indexes were mostly low and that the diversity and richness indexes were high. Moreover, the river health (index of biological integrity) was mostly excllent (1 site is good, 9 sites are very good). R. pseudosericeus inhabited widely from St. 3 to St. 9 in Heuk Stream, and its population size was large. Age groups for R. pseudosericeus estimated by the frequency distribution of total length in spawning season (April) indicated the 32~45 mm group as 1-year old, the 46~59 mm group as 2-years old, 60~69 mm group as 3-years old, and the 70~89 mm group as 4-years or older. Total length range of male and female was similar, and the sex ratio of female (426) to male (394) was 1 : 0.95. A. signifer, which had been released in Heuk Stream, inhabited from St. 4 to St. 5, but its population size was small. Lastly, this paper discusses a conservation plan for fish in Heuk Stream.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.10a
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• pp.91-92
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• 2000

식용해조류인 미역(Undaria pinnatifida)은 늦가을부터 겨울, 이른 봄 동안 자라고 봄부터 초여름까지 성숙하는 1년생 해조류로 내만의 입구에 가까운 곳이나 조류가 빠른 곳에서 번식을 하며 극동아시아와 우리나라 전 해안에 광범위하게 분포되어 있는 갈조류로써 그 생산량은 식용해조류중 62％를 차지하고 있으며 산후식품 또는 병약자의 건강을 회복하는 영양식으로 중요할 뿐만 아니라 특유의 부드러운 해조류 맛과 탁도 및 점성으로 오랫동안 섭취해 온 식품이다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.100-101
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• 2000

식용해조류인 미역(Undaria pinnatifida)은 늦가을부터 겨울, 이른 봄 동안 자라고 봄부터 초여름까지 성숙하는 1년생 해조류로 내만의 입구에 가까운 곳이나 조류가 빠른 곳에서 번식을 하며 극동아시아와 우리나라 전 해안에 광범위하게 분포되어 있는 갈조류로써 그 생산량은 식용해조류 중 62%를 차지하고 있으며 산후식품 또는 병약자의 건강을 회복하는 영양식으로 중요할 뿐만 아니라 특유의 부드러운 해조류 맛과 탁도 및 점성으로 오랫동안 섭취해 온 식품이다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.354-356
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• 2001

은어 Plecoglossus altivelis는 우리나라를 비롯하여 일본, 대만, 중국, 만주의 일부에만 분포하며 우리나라에서는 두만강과 한강을 제외한 모든 하천 및 하구부근에 분포 하는1년생 어류로, 최근 공업화에 따른 하천 수질의 오염과 댐 축조에 의한 하천 차단 등으로 인하여 자원은 급격히 감소하고 있으며 반면에 수요는 크게 증가하고 있어, 인공 종묘 생산의 필요성이 증대되고 있다. (중략)

• Journal of Korean Society of Forest Science
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• v.80 no.1
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• pp.82-96
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• 1991

This study was carried out to investigate the structural characteristics of Coleoptera communities inhabiting the crowns of the Korean pine(Pinus koraiensis S. et Z.). Four plantations of the Korean pine, stand A (11 years old), stand B(21 years old), stand C(31 years old), and stand D(46 years old), were selected in Sudong-myen, Namyangju-gun, Kyeonggi-do. Sampling was done by knock down methods using insectide(DDVP), which was conducted from April, 1986 to September, 1987, except for the winter season. The following major conclusions are drawn from this study : 1. The total number of Coleoptera was 107 species of 85 genera in 35 families : 83 species of 66 genera in 27 families in 1986 and 74 species of 52 genera in 30 families in 1987. 2. The abundant families, based on the number of species, were Staphylinidae (16.8%), Coccinellidae(7.5%), Chrysomlidae(6.5%), Curculionidae(6.5.%), and Cerambycidae(5.6%). These five families occupied 43.0% of the total number of species. 3. The important families, based on the number of individuals, were Cantharidae(28.2%), Catopidae(27.7%), and Coccinellidae(23.0%). These three families occupied 78.9% of the total number of individuals. 4. The important species, based on the number of individuals, were Podabrus sp. (22.6%, C-antharidae), Catnps sp. 1 (21.7%. Catopidae), Anatis halonis (15.2%. Coccinellidae). Dominant species was Podabrus sp. (25.2% in 1986 and Catops sp. 1(24.9%) in 1987. 5. Generally, more spices and individual numbers were found in older stands than in younger ones. 6. The Coleoptera communities decreased in the thinned stand (stand C). Such a phenomenon in the thinned stand was likely to last two or more years. 7. The Coleoptera communities reached their peak of abundance in May, and decreased thereafter.

• Journal of Korean Society of Forest Science
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• v.84 no.3
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• pp.356-360
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• 1995

Korean white pine(Pinus koraiensis S.et Z.) is one of the important silvicultural species due to its quality timber in addition to edible pine - nut production. Selective breeding method is under progress to improve growth and nut production for this species. This study was carried out to obtain genetic information necessary for establishing advanced generation seed orchard, such as genetic parameters and efficiency of early selection. Open - pollinated cones were collected from 50 plus trees. In the spring of 1986, test plantations were established at 3 different sites with 4 - year - old seedlings. Seedling height was measured from age 5 to 10 in plantations. Genetic and phenotypic correlations based on the log of the ratio of two ages (LAK) were expressed as simple regression with statistical significance($r^2=0.7862$ and 0.8256, respectively). If 20 years is presumed to mature, the most efficient age for early selection is 3 years after planting with efficiency of 1.96.

• Korean Journal of Medicinal Crop Science
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• v.9 no.4
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• pp.265-268
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• 2001

This experiment was conducted to investigate the effects of temperature, light, seed harvesting time, storage temperature, and period on its germination of Astragalus membranaceus. Optimum germination temperature was ${20{\sim}25^{\circ}C}$ and it was found to be light insensitive seed. The germination rates were not significantly different between 1-year and 2-year old plants, and seed harvesting times. Seeds stored at such cold temperatures as ${-4^{\circ}C\;and\;-20^{\circ}C}$ for 15 months showed over 80% in germination rate at the 6th day after placement. On the other hand, low germination rate of 60% at the 11th day was observed from the seeds stored at $4^{\circ}$ and room temperature.

• Korean Journal of Plant Resources
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• v.12 no.4
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• pp.276-281
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• 1999

This study was conducted to determine the appropriate transplanting time for growing one year old rhizome of Atractylodes macrocephala Koidz. Transplanting on March 20 and April 5 showed the highest in plant height and shoot fresh weight but dry rhizome weight was the highest in the transplanting time of April 5. As the growth time of 209 days showed was the highest yield of dry rhizome. As a result, it seemed that the appropriate planting time was April 5 to 10 in the north area of the Kyongsangbuk-do. The shortest emergence time was that the accumulated temperature of early growth period was 267$^{\circ}C$, and that of highest dry rhizome yield was 3$600^{\circ}C$ for whole growth period.