• 제목/요약/키워드: Loblolly Pine

검색결과 28건 처리시간 0.028초

The Swelling Response of Loblolly Pine (Pinus Taeda) Juvenile Wood to Water Submersion

  • Via, Brain K.;Hartley, Ian D.;Shupe, Todd F.;Lee, Sang Yeob;Lee, Byung G.
    • Journal of the Korean Wood Science and Technology
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    • 제33권2호통권130호
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    • pp.17-23
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    • 2005
  • Juvenile and transitional-juvenile wood samples from loblolly pine (Pinus taeda) were immersed in water to investigate longitudinal and tangential swelling properties. Increment cores from twenty-six loblolly pine trees were sampled at breast height (1.37 m). Earlywood rings 5 and 9 were separated from the core, extracted, oven-dried and immersed in water at room temperature. The variance in longitudinal swell was significant for ring 5 compared to ring 9 (p = 0.001). It was found that tangential swell might predict longitudinal swelling of juvenile wood at ring 9 but not at ring 5. Poor correlation in ring 5 suggests that swelling response in younger juvenile wood may differ. The swell response at ring 5 did not follow the shrinkage models discussed in the literature while ring 9 adhered to the expected curve.

한국(韓國)에서 테-다 소나무의 생육가능성(生育可能性) (Growth Feasibility of Loblolly Pine, Pinus taeda L. in Korea)

  • 노의래;최정석
    • 한국산림과학회지
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    • 제18권1호
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    • pp.23-33
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    • 1973
  • 테-다소나무 자연분포구역내의 종자산지별(種子産地別) 묘목(苗木)의 미국내조림 활착율(活着率)은 대체로 종자산지(種子産地)가 서북쪽으로 갈수록 높았으며 생장은 종자산지(種子産地)가 동남쪽으로 갈수록 좋았다. 따라서 우리나라의 내륙지방에 알맞는 산지로는 Arkansas Texas산(産)이 적합할 것으로 추정되며, 서해안 및 동해안 지방에는 Maryland, North Carolina 구능산이, 또 남해안에 North Carolina 해안산이 가장 유망시 되는 산지로 추정된다.

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동위효소분석(同位酵素分析)에 의(依)한 테다소나무(Pinus taeda L.) 클론의 식별(識別) (Identification of Loblolly Pine (Pinus taeda L.) Clones through Isozyme Analysis)

  • 류장발;나천수
    • 한국산림과학회지
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    • 제76권4호
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    • pp.330-337
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    • 1987
  • 테다소나무의 45 클론의 배유조직(胚乳組織)을 수평식(水平式) 전분(澱粉)겔로 전기영동(電氣泳動)시켰다. 영동(泳動)후 다섯 종류(種類)(GOT, SDH, PGM, MDH, AP)의 동위효소(同位酵素)의 활성(活性)을 조사(調査)한 결과 11개 유전자좌(遺傳子座)에서 각각 두 개 혹은 세 개의 대립유전자(對立遺傳子)가 존재(存在)하는 것으로 밝혀졌다. 상기 유전자좌(遺傳子座)중 열 개의 유전자좌(遺傳子座)의 유전자형(遺傳子型)을 비교하여 45 클론 모두를 식별(識別)할 수 있었다.

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Utilization of Masking Techniques to Ameliorate Agricultural Odorants

  • Yoon, Young-Mo;Schilling, Mark W.;Bazemore, Russell
    • Food Science and Biotechnology
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    • 제14권5호
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    • pp.689-693
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    • 2005
  • Different masking materials were evaluated for their ability to ameliorate odor of model poultry manure solution by assessing their effects on sensory pleasantness and odor intensity. Results indicated extracts from Eastern red cedar leaves, Loblolly pine needles', and commercial masking agents such as pine extract and odor neutralizer were effective (p<0.05) for masking odor of model poultry manure solution by increasing (p<0.05) pleasantness (82 and 86% increases in pleasantness using red cedar and pine needle extracts, respectively) and decreasing (p<0.05) odor intensity (odor intensity reduction by 66 and 76% using red cedar pine needle extract). The most odor-active compound in Loblolly pine needle extract was ${\alpha}$-terpineol (1,573.8 ug/g) which is responsible for aroma of pine trees (piney) and effective for ameliorating agricultural odors.

Impact of Residual Extractives in Kraft Pulps on Brightness and Color

  • Shin, Soo-Jeong;Sung, Yong-Joo;Park, Jong-Moon;Cho, Nam-Seok
    • 펄프종이기술
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    • 제41권5호
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    • pp.20-25
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    • 2009
  • Residual extractives had a noticeable impact on the brightness of unbleached hardwood kraft pulps (trembling aspen). The brightness-impacting extractives were effectively removed by oxygen delignification. In addition, oxygen delignification was more effective in removing chromophores in hardwood unbleached kraft pulps than in those of softwood (loblolly pine). The residual extractives in unbleached hardwood kraft pulps also affected the pulp color, primarily redness and the L value. These redness-related extractives in unbleached hardwood kraft pulps were also effectively removed by oxygen delignification. There were no significant color differences between untreated and solvent-extracted oxygen-delignified aspen kraft pulps. The residual extractives in unbleached and oxygen-delignified softwood (loblolly pine) kraft pulps did not have a significant impact on either brightness or pulp color.

임목(林木)에서의 F2 이용(利用) (Utilization of F2 Seeds in Forest Tree Breeding)

  • 전계상;손성인
    • 한국산림과학회지
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    • 제70권1호
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    • pp.109-114
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    • 1985
  • 임목(林木)의 교잡육종(交雜育種)에서 $F_2$종자(種子)를 이용(利用)하는 데는 위험(危險)이 따르지만 한편으로 매우 간편(簡便)하고 유용(有用)한 방법(方法)일 수도 있다. 그러나 $F_2$세대(世代)에서 야기(惹起)되는 변이(變異)는 많은 육종가(育種家)들이 염려(念慮)하는 것과 같이 심각(深刻)한것 같지는 않다. 한국(韓國)의 리기테다소나무 교잡육종(交雜育種)에 관(關)한 전반적(全般的)인 견해(見解)를 피력(被瀝)한 후(後) $F_2$종자(種子) 이용(利用)을 위(爲)한 금후(今後)의 육종방안(育種方案) 및 주의(注意)할 점(點)에 대(對)하여 논(論)하였다.

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Modelling Growth and Yield for Intensively Managed Forests

  • Burkhart, Harold E.
    • Journal of Forest and Environmental Science
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    • 제24권3호
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    • pp.119-126
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    • 2008
  • Growth and yield prediction methods, ranging from whole-stand models to individual-tree models, have been developed for forest types managed for wood production. The resultant models are used for a host of purposes including inventory updating, management planning, evaluation of silvicultural alternatives, and harvest scheduling. Because of the large investment in developing growth and yield models for improved genotypes and silvicultural practices for loblolly pine (Pinus taeda) in the Southern United States, this region serves to illustrate approaches for modelling intensively managed forests. Analytical methods and computing power generally do not restrict development of reliable growth and yield models. However, long-term empirical observations on stand development, which are time consuming and expensive to obtain, often limit modelling efforts. Given that growth and yield models are used to project present volumes and to evaluate alternative treatment effects, data of both the inventory type and the experimental type are needed. Data for developing stand simulators for loblolly pine plantations have been obtained from a combination of permanent plots in operational forest stands and silvicultural experiments; these data collection efforts are described and summarized. Modelling is essential for integrating and synthesizing diverse information, identifying knowledge gaps, and making informed decisions. The questions being posed today are more complex than in the past, thus further accentuating the need for comprehensive models for stand development.

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The Influence of Hardwood Interspecific Competition on Stand Structure and Dynamics for Loblolly Pine Plantations

  • Lee, Young-Jin;Cho, Hyun-Je;Kim, Dong-Geun;Bae, Kwan-Ho;Joo, Sung-Hyun;Hong, Sung-Cheon
    • The Korean Journal of Ecology
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    • 제24권4호
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    • pp.213-217
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    • 2001
  • The purpose of this study is to investigate the effects of hardwood competitions in stand structure and dynamics by applying prediction models for unthinned loblolly pine (Pinus taeda L.) plantations. A parameter recovery procedure for the Weibull distribution function based on four percentile equations was applied to develop diameter distribution prediction models. Four percentiles of the cumulative diameter distribution prediction equations were predicted as a function of quadratic mean diameter plus competin hardwood trees perhectare varibales. According to the results of this study. it was found that as the amount of competing hardwood trees increased, diameter distributions in terms of stand structure dynamics tended to be more skewed to the right. Therefore, the influence of non-planted hardwood trees interspecific competitoin on planted loblolly pines showed negative effects on the stand structure and dynamics.

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리기테다 수형목(秀型木) 차대(次代)들의 내한성(耐寒性)에 대(對)한 선발(選拔) (Selection of Pitch-loblolly Hybrid Pine Plus Tree Progenies for Cold-hardiness)

  • 박문한;손성인;전계상
    • 한국산림과학회지
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    • 제75권1호
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    • pp.46-50
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    • 1986
  • 1983~'84년도(年度)의 겨울동안 1년생(年生) 리키테다 수형목(秀型木)의 풍매차대(風媒次代)들에 대(對)한 내한성(耐寒性) 선발(選拔)이 자연상태(自然狀態)에서 이루어졌다. 이때 생존(生存)한 개체(個體)들을 경기도(京畿道) 반월(半月), 충남(忠南) 대덕(大德), 경남(慶南) 양산(梁山) 지방(地方)에 식재(植栽)하고 2년후(年後)인 1985년(年) 가을에 3년생(年生) 수고(樹高)와 1986년(年) 봄에 동해상태(凍害狀態)를 조사(調査)하였다. 경기도(京畿道)에서는 동해피해율(凍害被害率)이 5.6%이고 충남(忠南)에서는 22.6%로 선발(選拔)을 안 거친 비교구(比較區) 9.3%, 43.3%보다 각각(各各) 실제동해피해율(實際凍害被害率) 3.7%와 20.7%, 백분율(百分率)로 환산(換算)해서 40.0%, 47.8%의 효과(効果)를 거두었다. 또한 1년생(年生) 때 동해피해율(凍害被害率)이 높았던 가계(家系)들이 3년생(年生) 때에도 역시 동해(凍害)를 많이 받는 것으로 나타났다. 3년생(年生) 수고(樹高)에서는 가계간(家系間) 차이(差異)가 없었고, 환경변이(環境變異)의 오차분산(誤差分散)이 지나치게 커 아주 낮은 유전력(遺傳力)($h{\fallingdotseq}0.04$)을 보였다.

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