• Title/Summary/Keyword: 수목건전도

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Influences of Sulfur Dioxide on the Growth of Ornamental Trees (아황산가스가 조경수목의 생육에 미치는 영향)

  • Kim Tae Wook
    • Korean journal of applied entomology
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    • v.20 no.4 s.49
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    • pp.229-233
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    • 1981
  • This study was to investigate ornamental trees injuries at the Tobong ornamental tree farm, which is located in Uichongpu City, Kyonggido. The injury was caused by $SO_2$ gas from the smoke of the vicinal factories. The results obtained are as follows: 1 The total concentration of sulfur in leaves was increased with incerased degree of injury The most severe injuries were found at the distance between 70-120m from the western boundary of the Tobong ornamental 4ree farm with a highest concentration of total sulfur at $0.5-0.6\%$. This means the injuries caused by the acute injury and the temperature changes. 2. Significant differences were found between normal and injured portion of the same trees in Juniperus chinensis. 3. Anatomical study of the leaf tissues, showed the plasmolysis occured both in spongy and epidermal cells, leading to shrinkage and destruction. An intercellular space and stomatal periphery became wider.

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Development of infiltration facility by utilizing tree box for urban storm water runoff reduction (도시지역 우수유출 저감을 위한 식재박스형 침투시설의 개발)

  • Joo, Jin-Gul;Cho, Hye-Jin;Lee, Yu-Hwa;Kim, Lee-Hyung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.11
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    • pp.5330-5336
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    • 2011
  • It becomes more and more important to develop various infiltration facilities for healthy water cycle and reduction of urban storm water runoff. In this study, a infiltration facility by utilizing tree box was developed. The developed facility is capable of reducing storm water road runoff, improving urban water cycle, and performing other sustainable and environmental functions. Because the facility can be manufactured to a smaller size than an existing runoff reduction facility, it can be installed at various road types of not only existing urban areas, but new developed areas. If the facility is applied to four-lane roadways, it is expected to reduce 65% of rainfall runoff discharge. Urban flood control improvement can be accomplished by a wide application of the developed technique.

Use Impacts of Trail and Campsite on Natural Environments in Mt. Palgong Natural Park (팔공산자연공원에서의 등산로 및 야영장 이용이 자연환경에 미치는 영향)

  • 권태호
    • Journal of the Korean Institute of Landscape Architecture
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    • v.17 no.3
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    • pp.21-34
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    • 1990
  • Trail and campground deteriorations and their environmental changes of soil and vegetation were studied in Tonghwa -Sa district of Mt. Palgong Natural Park through 1988 into 1989. The results are summarized as follows : 1. The bare width of trail as one of the trail condition factor was significantly greater on the more heavily used trail. Deterioration types of trail which had higher frequency for a total of 45 observations were rock exposure(42%), trail deepening(40%) and root exposure(18%) in the high order. And also sound type on which the trail was not deteriorated at all amounted to 33% of all observations. 2. Ecological changes of soil and vegatation of trailsides were not found at a uniform tendency except that soil hardness was slightly decreased from trail edge to the forest, but they could be grouped by the type of user\`s behavior and site conditions. Use impacts on the natural environment of trailside in Mt. Palgong are still far from the severe harmulness. 3. Worse damages to compground condition were appeared in Bawi-gol than Susu-gol campsite. Types of mechanically damaged trees were tree with exposed root(63% ), scared tree(43% ), mutilated tree(30 % ) and felled tree in highly frequent order. And diameter increments of trees in campsites were oppressed by the campers. 4. Tree damage types and their frequencies could be basic as a means of which grasp the bounds of user's impacts. User's disturbance on campsite extended to the distance of 70∼90m from the core of campsite at Pawi-gol and 20∼30m at Susu-gol respectively. As the tolerant trees to use impact, Lespedeza maximowiczii, Rhus trichocarpa, Acer palmatum, Rubus crataegifolius and Celastrus orbiculatus were considered.

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Effects of Human Error on the Optimal Test Internal and Unavailability of the Safety System (안전계통의 이용불능도 및 최적시험주기에 미치는 인간실수의 영향)

  • Chung, Dae-Wook;Koo, Bon-Hyun
    • Nuclear Engineering and Technology
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    • v.23 no.2
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    • pp.174-182
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    • 1991
  • Effects of human error relevant to the periodic test are incorporated in the evaluations of the unavailability and optimal test interval of a safety system. Two types of possible human error with respect to the test and maintenance are considered. One is the possibility that a good safety system is inadvertently left in a bad state after test(Type A human error) and the other is the possibility that a bad safety system is undetected upon the test(Type B human error). An event tree model is developed for the steady-state unavailability of a safety system in order to determine the effects of human errors on the system unavailability and the optimal test interval. A reliability analysis of the Safety Injection System (SIS) was peformed to evaluate the effects of human error on the SIS unavailability. Results of various sensitivity analyses show that ; (1) the steady-state unavailability of the safety system increases as the probabilities of both types of human error increase and it is far more sensitive to Type A human error, (2) the optimal test interval increases slightly as the probability of Type A human error increases but it decreases as the probability of Type B human error increases, and (3) provided that the test interval of the safety injction pump is kept unchanged, the unavailability of SIS increases significantly as the probability of Type A human error increases but slightly as the probability of Type B human error increases. Therefore, to obtain the realistic result of reliability analysis, one should take shorter test interval (not optimal test interval) so that the unavailability of SIS can be maintained at the same level irrespective of human error. Since Type A human error during test & maintenance influeces greatly on the system unavailability, special efforts to reduce the possibility of Type A human error are essential in the course of test & maintenance.

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Detection of Mycoplasma-like Organisms in Some Trees by Fluorescence Microscopy with Berberine Sulphate (Berberine Sulphate를 이용(利用)한 형광현미경기법(螢光顯微鏡技法)에 의(依)한 수목(樹木)마이코플라스마검정(檢定))

  • Bak, Won Chull;La, Yong Joon
    • Journal of Korean Society of Forest Science
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    • v.80 no.2
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    • pp.232-236
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    • 1991
  • The efficacy of berberine sulphate, a fluorochrome having binding properties with both DNA and RNA, was investigated for the detection of mycoplasma-like organisms(MLOs) in jujube(Zizyphus jujuba), paulownia(Paulownia tomentosa), mulberry(Morus alba) trees and periwinkle (Catharanthus roseus) plant. When examined under fluorescence microscope, berberine sulphate-stained sections of diseased samples showed distinct MLO-specific fluorescent particles in the phloem area, while such fluorescence was absent in the healthy ones. This staining technique was proved to be a very accurate method for the diagnosis of MLO infections in woody and herbaceous plants. Furthermore, the cheap and easy procedure could be used to test a great number of samples on MLO infections with reliability and rapidity.

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Boring Insects of the Pinus densiflora S. et Z. in Korea (소나무를 가해(加害)하는 천공성해충(穿孔性害蟲)에 관(關)한 연구(硏究))

  • Lee, Chan-Young;Lee, Sang-Bae
    • Journal of Korean Society of Forest Science
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    • v.89 no.5
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    • pp.609-617
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    • 2000
  • To inverstigate the boring insects in Pinus densiflora forests, bait logs were set up in healthy-looking forests of Chunchon Hongchon and in damaged forests(gall formation rate 70----) by Thecodiplosis japonensis of Pyongchang Jeongsun. The period of investigation was from April to August in 1999. Boring insects investigated were 35 species of 12 families. Five species of them were unrecorded species from Korea. Natural enemies investigated were 5 species of 2 families. The prefered parts of tree according to species of boring insects were lower trunk in Siphalinus gigas and 3 other species, middle-stem in Monochamus sutor and 7 other species, and top stem in Orthotomicus suturalis and 1 other species. Hylurgops interstitialis were found in all parts of tree. Sap wood was attacked by Xyleborus validus Cerambycidae, heart wood by Hylobitelus haroldi Siphalinus gigas, and cambium region by Pissodes nitidus P. obscurus Shirahoshizo insidiosus Scolytidae.

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Trail and Campground Deteriorations and Use Impact on their Natural Environment in Mt. Kaya National Park (가야산국립공원의 등산로 및 야영장 훼손과 주변 환경에 대한 이용영향)

  • 권태호;오구균;정남훈
    • Korean Journal of Environment and Ecology
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    • v.3 no.1
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    • pp.81-94
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    • 1989
  • Use impacts to trail and campground deteriorations and their changes of natural environment were studied in Mt. Kaya National Park in 1989. The entire width, bare width and maximum depth of trail as the trail condition were significantly greater on the more heavily used trail. Deteriorations of trail which were surveyed at the total of 51 were significantly different from those of non-deteriorated points. The changes of soil and vegetation of trailsides were not found at a uniform tendency but could be more clearly grouped by the types of user's disturbance, and use impact on trailside had reached 15m inside of forest. Percentage of area for Class 5 in campsite was about 36% and about 69% of campsite area was more severe than Class 3. Recreational activities retarded the diameter growth of trees in campsite and accelerated the different composition of species. Soil and vegetative factors adapted to understand the difference of use amount and the realm of use impact could be sorted. The realm influenced by user's disturbance was about 50m from the core of campsite. Fraxinus rhynchophylla, Rhus trichocarpa, Symplocos chinensis for. pilosa and Stephanandra incisa were considered as the tolerant species to user's impact.

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Flowering Characteristics and Acorn Production of Quercus auta Thunb. in Wando Island, Korea (완도지역 붉가시나무의 개화특성과 종실생산)

  • Park, In-Hyeop;Kim, So-Dam;Park, Jong-Won;Chae, Kyung-Seog;Kim, Gab-Tae;Um, Tae-Won
    • Korean Journal of Environment and Ecology
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    • v.28 no.3
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    • pp.326-330
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    • 2014
  • Flowering characteristics and acorn production of Quercus acuta were studied in a Quercus acuta forest at Wando island, Korea. Three sample trees were cut and measured to investigate flowering characteristics during flowering season. Eight $20m{\times}25m$ quadrats were set up and three $1m{\times}1m$ seed traps were established within each quadrat to investigate acorn production. There were no significant differences in number of female and male inflorescence per bearing shoot among crown positions, but these values decreased from the upper part to the lower part of crown. The number of female flowers was 5,025 flowers/tree, and of the total number, 60.3% was in the upper part, 28.4% was in the middle part and 11.3% was in the lower part of crown. The number of male flowers was 7,063 flowers/tree and increased from the lower part to the upper part of crown. Acorn production of total 24 seed traps was 947 acorns/$24m^2$, and of total acorn production, 11.0% was sound, 61.9% was damaged, 25.1% was decayed and 2.0% was empty. Monthly acorn production was 240 acorns/$24m^2$ in August, 632 acorns/$24m^2$ in September, 56 acorns/$24m^2$ in October, 17 acorns/$24m^2$ in November and 2 acorns/$24m^2$ in December. Acorns fallen in October showed higher mean length, diameter and weight than those of other months.

Acorn Production and Characteristics of Quercus acuta Thunb - Focused on Wando, Jindo and Haenam in Jeollanam-do, Korea - (붉가시나무의 종실 생산량 및 형질특성 - 전라남도 완도, 진도, 해남을 중심으로 -)

  • Kim, Sodam;Park, In-Hyeop
    • Korean Journal of Environment and Ecology
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    • v.35 no.6
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    • pp.621-631
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    • 2021
  • The purpose of this study is to survey and analyze acorn production and characteristics of the Quercus acuta Thunb. according to the need for information on seed supply and seedling cultivation during the restoration of warm broad-leaved forests. For the survey, a total of 30 seed traps with a surface area of 1 m2 were set up, 3 in each of 10 quadrats (8 in Wando, 1 in Haenam, and 1 in Jindo). The acorns that fell in the seed trap at the end of each month were collected from August to December each year between 2013 to 2016. The collected acorns were then classified into sound, damaged, decayed, or empty grade, and the number of acorns produced was calculated. In the case of sound acorns, acorn traits, such as length, diameter and weight of acorns without cupule, were measured. Duncan's multiple tests of acorn production and characteristics were conducted for comparative analysis of the annual average values with the values by year, stand, month, and treatment plot. The annual number of acorn dropped into the seed traps in each quadrat from 2013 to 2016 was 5-350 acorns/3 m2 in 2013, 17-551 acorns/3 m2 in 2014, 5-454 acorns/3 m2 in 2015, and 14-705 acorns/3 m2 in 2016. There was a large difference in acorn production between the quadrats, presumably attributed to the difference in the amount of light received due to the density of trees in the square. Annual acorn production per area was 335,000 acorns/ha in 2013, 932,000 acorns/ha in 2014, 556,000 acorns/ha in 2015, and 1,037,000 acorns/ha in 2016. That was a sharp variation of acorn production in the two-year cycle. As the fluctuation in the production of Q. acuta showed simultaneity between stands, it is judged that Quercus acuta Thunb. had a clear cycle of fruitfulness and fruitiness between forest objects. September showed the biggest amount of fallen acorns and largest damage from insect pests, indicating that preventing early fall of acorns could increase the fruiting period and enable mass production of sound acorns. There was no significant difference between annual average acorn length in each region. In the case of the acorn diameter and weight, the average values of acorns from Haenam were significantly higher than those from Wando and Jindo. There was no significant difference in the average annual acorn characteristics by month, and the average annual acorn length, diameter, and weight in November were 19.72mm, 12.23mm, and 1.64g, respectively, the highest between August and November.

Air Pollution Tolerance Index (APTI) of Main Street Trees Following Ozone Exposure (주요 가로수 묘목의 오존노출에 따른 대기오염내성지수 비교)

  • Cho, Su Bin;Lee, Hyung Sup;Lee, Jong Kyu;Park, Sang Hee;Kim, Han Dong;Kwak, Myeong Ja;Lee, Keum Ah;Lim, Yea Ji;Woo, Su Young
    • Journal of Korean Society of Forest Science
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    • v.109 no.1
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    • pp.50-61
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    • 2020
  • Street trees are very important to urban environments as they can alleviate air pollution. However, when ozone is absorbed through the stomata, it can induce the formation of free radicals inside the tree, negatively affecting the vegetation. The present study investigated the Air Pollution Tolerance Index (APTI) of four major street tree species: Prunus yedoensis, Zelkova serrata, Chionanthus retusus, and Pinus densiflora. Two-year-old seedlings were placed in a phytotron and fumigated with 100 nL·L-1 (ppb) ozone for 4 weeks, following which the ascorbic acid contents, chlorophyll contents, leaf pHs, and relative water contents were measured. There was no significant difference in the APTI of Prunus yedoensis and Zelkova serrata between the ozone and control treatments. By contrast, the ozone treatment caused the APTI of Chionanthus retusus to increase and that of Pinus densiflora to decrease compared with the respective controls. These results suggest that the APTI of these tree species exhibit very different responses to ozone. Therefore, more detailed research should be conducted on a range of species in the future.