• 제목/요약/키워드: PINE TREE

검색결과 619건 처리시간 0.027초

정전기 방전시의 소나무목분의 최소착화에너지 측정에 관한 연구 (A Study of Measurement of Minimum Ignition Energy for Pine Tree Dust on Electrostatic Discharges)

  • 이동훈;박한석
    • 한국안전학회지
    • /
    • 제13권3호
    • /
    • pp.74-79
    • /
    • 1998
  • To establish measuring method for minimum ignition energy of explosive powders caused by electrostatic discharge, A measuring method(Hartman) using a very small quantity of pine tree testing powder was proposed, and the influence of discharge current limiting resistance connected in series into a capacitive discharge circuit on ignition energies of explosive powders was investigated. As a result the minimum ignition energy was 42.25mJ when discharge current limiting resistance 300 $k\Omega$.

  • PDF

Altitudinal Variation in Species Composition and Soil Properties of Banj Oak and Chir Pine Dominated Forests

  • Kumar, Munesh;Singh, Harpal;Bhat, Jahangeer A.;Rajwar, G.S.
    • Journal of Forest and Environmental Science
    • /
    • 제29권1호
    • /
    • pp.29-37
    • /
    • 2013
  • The study was carried out in two different forest types viz., Banj oak and Chir pine forests to assess the variation in forest species composition and soil properties along altitudinal gradients in the Garhwal Himalayas. The results of the study showed that between the forests soil moisture was higher in Banj oak forest because of closed canopy and dense forest compared to Chir pine forest. The sand particles were reported higher in Banj oak forest which might be due to the addition of organic matter favouring coarse structure of soil, helping in holding maximum water in soils. However in the Chir pine forest low amount of soil organic matter and presence of clayey soil, develops soil compactness which reduces the penetration of water resulting in high soil bulk density. The higher accumulation of litter and presence of moisture in Banj oak forest favours higher nutrient level of nitrogen, phosphorus and potassium compared to Chir pine forest. The soil organic carbon also reduced with increasing altitude at both gradients. While bulk density has reverse trend with soil organic carbon in both the forests at different peaks of same region. In Banj oak forest, the highest density and total basal cover was reported 1,100 tree $ha^{-1}$ and 58.86 $m^2\;ha^{-1}$ respectively. However, the highest values of density and total basal cover of Chir pine forest was 560 tree$ha^{-1}$ and 56.94 $m^2\;ha^{-1}$ respectively. The total density and basal cover of both the forests reduced with increasing altitude. The study concludes that Banj oak forest has better nutrient cycling ability, well developed foest floor and has a greater protective and productive features compared to the Chir pine forest which is without lower vegetation cover and having only pine litter accumulation which does not allow any other species to grow.

울진 소광리 금강소나무림 식생구조 특성에 따른 관리방안 (A Study on the Management Method in Accordance with the Vegetation Structure of Geumgang Pine (Pinus densiflora) Forest in Sogwang-ri, Uljin)

  • 김동욱;한봉호;박석철;김종엽
    • 한국조경학회지
    • /
    • 제50권1호
    • /
    • pp.1-19
    • /
    • 2022
  • 울진 소광리 금강소나무림은 전통적으로 목재생산 목적의 소나무 보호지역(봉산)이었으며, 현재는 산림청 산림유전 자원보호구역으로 지정·관리되고 있다. 본 연구는 지형 특성, 현존식생, 수령, 식물군집구조를 분석하여 임목생산을 목적으로 한 울진 소광리 금강소나무림의 지속가능한 관리방안을 제안하고자 하였다. 대상지 지형 특성은 능선 36.7%, 계곡 38.7%로 능선과 계곡의 비율이 유사하였으며, 사면은 전체 면적의 24.7%로 좁게 형성되어 있었다. 소나무림 군집 유형은 소나무림의 갱신 진행상태, 낙엽활엽수 등 타 수종과의 경쟁상태, 층위구조 형성 여부 등을 기준으로 6개 유형으로 구분되었다. 대경목 소나무(흉고직경 40~60cm)의 수령은 약 60~70년 내외로 비교적 수령이 낮은 것으로 확인되었다. 상대우점치 및 층위구조를 분석한 결과, 소나무림 갱신 사업의 진행 정도에 따라 차이를 보이고 있었고, 소나무림의 유지뿐만 아니라 소나무 후계림의 조성, 소나무의 밀도 조절, 경쟁수목에 대한 적극적 관리를 실시하고 있었다. 군집별 평균 흉고단면적은 400m2 방형구를 기준으로 교목층은 12,642.1~25,424.4cm2, 아교목층은 1.8~1,956.5cm2이었다. 흉고단 면적의 차이는 교목층을 형성하는 수목의 규격과 개체수, 소나무림의 갱신 정도(소나무 간벌 후 시간경과 정도)에 따라 차이가 나타났다. 군집별 평균 출현 종수는 8.7~20.3종으로 계곡부에 위치하고 있는 유형과 관리가 이루어지지 않아 낙엽활엽수와의 경쟁이 진행 중인 유형에서 출현 종수가 많았다. 종다양도는 0.6915~1.0942로 온대중부지역 소나무군집과 비교하여 낮은 것으로 평가되었다. 울진 소광리 금강소나무림의 관리목표는 경제적 가치가 높은 목재생산으로 설정하였으며, 지속적인 조림 및 목재생산 체계 구축, 목재생산량 증진을 위한 효율적 식생관리를 관리방향으로 제시하였다.

근세조선의 왕목-사직수, 문화사회적 임업, 그리고 문화적 지속가능성 (The Royal and Sajik Tree of Joseon Dynasty, the Culturo-social Forestry, and Cultural Sustainability)

  • 이정호;전영우
    • 한국산림과학회지
    • /
    • 제98권1호
    • /
    • pp.66-81
    • /
    • 2009
  • '환경을 조성하고 보전하는 인간과 문화'의 새로운 시각에서 지속가능한 숲 관리는 '문화적 지속가능성' 개념으로 재구성할 수 있다. 문화적 지속가능성은 환경을 조성하고 보전하는 문화의 높은 기여도를 강조하는 것이다. 본 연구는 근세조선의 '문화사회적 임업'의 역사적 사례를 통해서 현대의 문화적 지속가능성에 필요한 함의들을 추출하는 데에 그 목적이 있다. 조선의 첫 번째 왕이었던 태조와 관련하여 소나무(Pinus densiflora)는 조선의 왕목이었고 왕도정치의 이념을 지지하는 성리학적 신앙과 예제 체제 속에서도 가장 상위에 속하는 사직제례와 관련 있는 사직수(社稷樹)였다. 사직 제례의 숭배대상은 토지신(社)과 곡식신(稷)인데 고대 사회의 수목신앙을 이으면서 유교적 신앙 및 예제에 편입된 것이 토지신이며 토지신의 구체적 모습이 사직수이다. 왕목과 사직수로서의 소나무는 조선 왕실 통치의 종교-정치적 정통성을 지지하는 중요한 역할을 담당하였다. 소나무의 종교-정치적 상징성은 여러 측면으로 표현되었다. 소나무는 조선 조정이 주관하는 예제가 봉행되는 신전과 사당을 위해서도 물적 기반으로도 쓰였다. 소나무의 이런 역할은 왕실 능원림, 왕실 관곽재를 위한 황장봉산의 소나무 숲, 왕의 거처 도성 내외사산 소나무 숲의 조성, 방제, 보전, 관료적 관리로 확대 표현되었다. 문화사회적 임업의 역사적 사례인 이러한 소나무 숲의 종교-정치적 관리 체계는 조선의 경제적인 숲 관리 체계인 송정이나 조선 전기의 의송처와 금산의 소나무 숲 및 조선 후기의 봉산 체계의 소나무 숲의 경영과도 비교가 가능하고 공통성과 고유성을 함께 보여준다. 왕실의 소나무 문화는 대중적 의식에도 영향을 끼쳐 백성들이 금표가 있는 능원림, 금산, 봉산에서 시행된 금양(禁養)된 토지 또는 숲과 바꾸어 쓸 수도 있는 '말림갓'이라는 순한국어 단어를 형성하게 만든 것으로 보인다. 근세조선은 사직단, 능원림, 황장금산 및 황장봉산, 도성내외 사산의 소나무숲을 대상으로 하는 문화사회적 임업을 실행하였다. 조선 시대 소나무 숲의 보전과 경영에는 풍수지리, 민속신앙, 불교적 요소가 통합된 조선의 성리학적 신앙과 예제가 경제적 목적보다도 더욱 중요한 역할을 담당하였다. 인간과 환경의 상호작용이 여러 세대를 걸쳐 장기적인 문화-자연적 평형이나 균형을 이루는 것이 문화적 지속가능성인데, 숲과 환경을 조성하고 보전하는 현대인이 문화-자연 유산을 발굴하고 여러 세대에 걸친 보전으로 변환하며, 문화적, 사회적, 정신적 필요를 충족하는 환경과 인간의 상호작용에 대한 초학제적 지식인 지속가능성 과학 지식을 생산하는 것이 중요하다는 것이 근세조선의 사례 연구의 함의로 추출되었다.

화순 쌍봉사 극락전 아미타불 연화좌대의 수종 및 연륜연대 분석 (Species Identification and Tree-Ring Dating of the Lotus Pedestal of Amitabha Statue at Ssangbong-Temple in Hwasun, Korea)

  • 김요정;손병화;오정애;조태건;최선일;박원규
    • 한국가구학회지
    • /
    • 제23권1호
    • /
    • pp.95-102
    • /
    • 2012
  • The objective of this study was to conduct the species identification and tree-ring dating of Lotus Pedestal of the Amitabha Statue at Ssangbong-Temple in Hwasun. The six wood blocks used for the Lotus Pedestal were hard pines (Pinus spp.; diploxilon) except one piece which was ginkgo (Ginkgo biloba L.). The lotus leaves surrounding the pedestal body were also made of ginkgo. Tree-ring patterns of 3 blocks were synchronized and a 133 years chronology was made. The chronology was crossdated well with the master chronology of Japanese red pine in South Korea. It dated back to A. D. 1551~1683, i.e. the last ring dated A. D. 1683. Through the estimation of the number of sapwood rings removed during carving, the felling year was calculated A. D. $1704{\pm}10$. The calligraphic writing on the Pedestal indicated that this statue was made in A. D. 1694. Therefore, the accuracy of the tree-ring dating has been proven.

  • PDF

Cryopreservation of Pine Wood Nematode, Bursaphelenchus xylophilus

  • Park, Ju-Yong;Shin, Keum-Chul;Kim, Kyung-Hee;Lee, Seung Kyu;Lee, Jong Kyu
    • 한국산림과학회지
    • /
    • 제94권5호통권162호
    • /
    • pp.334-337
    • /
    • 2005
  • Pine wood nematode isolates from Haman, Gyoungsangnam-do were cryopreserved with three different cryoprotectants (glycerol, ethylene glycol and dimethylsulfoxide), Nematode Growth medium (NGM) and M 9 buffer solution, respectively, and then survival rate, reproduction ability, and pathogenicity of stored nematodes were compared. Survival rates of juvenile was excellent in 15% glycerol solution as $72{\pm}5.3%$. The survival ability of nematodes at juvenile stage was more efficient than that of nematodes at adult stage. Pre-incubation treatment at $4^{\circ}C$ before storing in liquid nitrogen didn't affect the survival ability of pine wood nematode. When the reproduction ability of nematodes was confirmed on Botrytis cinerea agar plates at $28^{\circ}C$ incubator, there was no difference between cryopreserved and non-cryopreserved. Pathogenic ability of cryopreserved nematodes was also evaluated and confirmed by artificially inoculating them on 2-year old red pine seedlings.

Estimation of Carbon Stock in the Chir Pine (Pinus roxburghii Sarg.) Plantation Forest of Kathmandu Valley, Central Nepal

  • Sharma, Krishna Prasad;Bhatta, Suresh Prashad;Khatri, Ganga Bahadur;Pajiyar, Avinash;Joshi, Daya Krishna
    • Journal of Forest and Environmental Science
    • /
    • 제36권1호
    • /
    • pp.37-46
    • /
    • 2020
  • Vegetation carbon sequestration and regeneration are the two major parameters of forest research. In this study, we analyzed the vegetation carbon stock and regeneration of community-managed pine plantation of Kathmandu, central Nepal. Vegetation data were collected from 40 circular plots of 10 m radius (for the tree) and 1m radius (for seedling) applying a stratified random sampling and nested quadrat method. The carbon stock was estimated by Chave allometric model and estimated carbon stock was converted into CO2 equivalents. Density-diameter (d-d) curve was also prepared to check the regeneration status and stability of the plantation. A d-d curve indicates the good regeneration status of the forest with a stable population in each size class. Diversity of trees was very low, only two tree species Pinus roxburghii and Eucalyptus citriodora occurred in the sample plots. Pine was the dominant tree in terms of density, basal area, biomass, carbon stock and CO2 stock than the eucalyptus. The basal area, carbon stock and CO2 stock of forest was 33±1.0 ㎡ ha-1, 108±5.0 Mg ha-1 and 394±18 Mg ha-1, respectively. Seedling and tree density of the plantation was 4,965 ha-1 and 339 ha-1 respectively. The forest carbon stock showed a positive relationship with biomass, tree diameter, height and basal area but no relationship with tree density. Canopy cover and tree diameter have a negative effect on seedling density and regeneration. In conclusion, the community forest has a stable population in each size class, sequestering a significant amount of carbon and CO2 emitted from densely populated Kathmandu metro city as the forest biomass hence have a potentiality to mitigate the global climate change.

무인항공기(UAV) 영상을 이용한 소나무재선충병 의심목 탐지 (Detection of Damaged Pine Tree by the Pine Wilt Disease Using UAV Image)

  • 이슬기;박성재;백경민;김한별;이창욱
    • 대한원격탐사학회지
    • /
    • 제35권3호
    • /
    • pp.359-373
    • /
    • 2019
  • 소나무재선충병은 우리나라 소나무림에 심각한 위협이 되고 있는 질병이다. 그러나 일반적으로 재선충병의 고사목 관측은 현장조사를 기반으로 하고 있기 때문에 물리적, 경제적 문제가 있어 대규모 삼림을 관측하는데 어려움이 있다. 본 연구에서는 소나무재선충병이 재발한 지역에 무인 항공기를 이용하여 고해상도 영상을 획득하였다. 이후 Artificial Neural Network(ANN), Support Vector Machine(SVM) 감독분류 기법을 통해 소나무재선충병 의심목을 탐지하였고. 감독분류 결과에 대한 정확도를 산출하였다. 또한 접근성이 높은 산림에 대해 감독분류를 실시한 후 현장 조사 결과간의 비교를 통해 정확도의 신뢰성을 검증하였다.

소나무재와 고추나무대재 합성에 관한 연구 (Synthesis of Pine Tree Ash and Red Pepper Stem Ash)

  • 한영순;이용석;이병하
    • 한국세라믹학회지
    • /
    • 제43권7호
    • /
    • pp.393-401
    • /
    • 2006
  • The development of Korean glaze originated from the development of ash glazes. Ash not only has strong solubility but also can shows the glaze a variety of different colors according to what the glaze has in it as the main component. In addition, it gives a feeling of lucidness and softness. For these reasons, there are a lot of needs for ash and many potters want to take advantage of ashes as glaze. But natural ashes have not been widely used as glaze primarily because it is relatively hard to find or manufacture. Considering the difficulty of finding or manufacturing natural ashes, this study aims to formulate synthetic ash which not only is available to the potters in general but also has the sam ε characteristics as the natural ashes. To achieve this aim, this study examines the characteristics of the pine tree ash, the main component of the glaze of celadon porcelains, and the red pepper stem ash, the main component of the brown glaze, both of which have been used by the Korean traditional potters. In this study, the alkaline component of the glaze. A important ingredient when the ashes are synthesized, was supplied by mixing of $Na_2CO_3$, Chungju limestone and rice straw ash. Furthermore, the synthetic ash, when it shows no change of pH in its composition rate of 6:2:2, was found to be usable as the most stable material. In conclusion, the formula which frits some raw $materials-Na_2CO_3$, Chungju limestone and rice straw ash-can duplicate the synthetic ash which is simila to the natural ash.

Effect of agricultural materials of traditional agriculture on control of rice blast (Pyricularia oryzae)

  • Jang, Se Ji;Yun, Young Beom;Kim, Yeon Ji;Jeong, Jang Yong;Kuk, Yong In
    • 한국작물학회:학술대회논문집
    • /
    • 한국작물학회 2017년도 9th Asian Crop Science Association conference
    • /
    • pp.182-182
    • /
    • 2017
  • The objective of this research was to determine controlling effects on rice blast (Pyricularia oryzae) in rice plants by using plant extracts from different extraction methods (water, boiling water, fermentation, and ethanol) from 38 agricultural materials of traditional agriculture. Rice blast was completely suppressed by 3% ethanol extracts in Rheum palmatum roots, and suppressed 97% and 77% by 10% ethanol extracts in onion bulb and pine tree leaves, respectively in a laboratory test. However, other agricultural materials showed low effect on suppression of rice blast. Additionally, in a seedling test, rice injury of two cultivars (Ilmibyeo and Hopyoungbyeo) against rice blast was reduced 40-71%, 29-63%, and 23-63% by 5 and 10% ethanol extracts in Rheum palmatum roots, onion bulb, and pine tree leaves, respectively, compared with non-treated controls. Rice injury of two cultivars (Ilmibyeo and Hopyoungbyeo) against rice blast was reduced by 21-55%, 23-46%, and 5-39% in response to Rheum palmatum roots, onion bulb, and pine tree leaf applications at 100, 200 and $400g/m^2$ at 0 day after seeding, respectively, compared with non-treated controls. Rice plants did not show any leaf injuries and growth reduction after treatments of the Rheum palmatum roots, onion bulb, and pine tree leaf extracts or soil application. Thus, the above materials may be used for controlling rice blast in organically produced rice fields.

  • PDF