• 생물환경조절학회지
• /
• 제19권4호
• /
• pp.275-283
• /
• 2010

작물의 묘소질은 정식 후 본포에서의 생육이나 수량, 품질에 영향을 미치기 때문에 작물 재배에서 있어서 육묘는 매우 중요하다. 본 연구는 차광을 이용한 다양한 광 수준이 토마토묘와 수박 접목묘의 생육에 어떠한 영향을 미치는지 살펴보고 차광에 의해 변화된 초장, 건물중, 경경 등의 건묘를 나타내는 중요 생육지표간의 상관관계를 분석하여 그동안 사용된 건묘를 판단하는 지표에 대해 검토하기 위해 수행하였다. 차광은 PE 비닐을 이용하여 하루 중 누적광량을 25, 50, 75%를 감소시켰다. 50% 이상 차광할 경우 누적광량에 비하여 토마토묘와 수박 접목묘의 엽면적이 크게 증가하였고 엽면적 지수가 빠르게 증가하였다. 건물중은 차광수준에 따라 감소하는 것으로 나타났다. 누적광량에 따른 토마토묘와 수박 접목묘의 생육은 무차광에 비하여 차광처리에서 빠르게 증가하였다. 토마토묘와 수박 접목묘의 경경은 차광 처리간의 큰 차이를 보이지 않았다. 토마토묘의 경우 단순히 초장과 건물중과의 상관관계가 높았지만 수박 접목묘의 경경은 초장과 상관관계가 없는 것으로 나타났다. 토마토묘의 경경은 묘소질을 판단하기에는 부적절하지만 수박 접목묘의 경우 초장과 함께 경경은 묘소질 판단하는데 이용 가능할 것으로 판단된다.

• Plant Resources
• /
• 제4권1호
• /
• pp.13-25
• /
• 2001

Growth and yield of licorice were investigated under the different conditions of photoperiod and shading in order to establish its cultural practice for the domestic production with the aim to substitute the import. The photoperiod was adjusted to 8,10, and 12 h by shielding plants from the light with blackout curtain. Large seedlings(11-20g) appeared to be affected by photoperiod since around 65 days. Most of growth parameters, including plant height, number of leaf, fresh and dry weight of plant and root, were the highest in 12 h photoperiod among all the photoperiod levels, excepting stem diameter which was the highest in 10 h photoperiod(4.5mm). Each photoperiod was similar to each other in root length and diameter. Small seedlings(4-l0g) showed a similar trend to large seedlings. The results from field photoperiod experiment demonstrated that 12 h photoperiod was also the best among three photoperiod treatments in plant height, stem diameter, number of leaf, root length, fresh and dry weight of plant and root. The effect of shading was tested under the three levels of control (0%), half-shading (55%), and full shading (90%). Shading remarkably suppressed the growth and yield, compared to no-shading. Although plant height and root length were little affected by the shading, stem and root diameters were heavily reduced.

• Journal of the Korean Wood Science and Technology
• /
• 제51권5호
• /
• pp.345-357
• /
• 2023

The present study conducted a stem analysis to trace growth information of Japanese larch (Larix kaempferi) and predict the future changes in growth volume. For this purpose, six L. kaempferi trees over 47 years old were cut at 1-2 m intervals from a height of 0.2 m, and circular plates of 5 cm thickness were collected for stem analysis. The analysis indicated that approximately 1-8 years are required to grow up to chest height. The annual height and diameter growth increased rapidly until the trees are 15 years old and gradually decreased after 20 years. The volume of 30-year-old trees in Oegam-ri forests, which were well-managed after artificial reforestation, was 0.4837 m³, whereas that in unmanaged Singi-ri forests was 0.1956 m³. Although the volume of individual trees differed greatly depending on the forest management status, it was found that the volume increased by 1.67-1.76, 2.49, and 3.49 times at 40, 50, and 60 years age, respectively, compared to the legal harvesting age 30. Therefore, factors such as the carbon dioxide reduction effect, forest management benefits, and the condition of trees at the site should be considered before harvesting trees.

• 환경생물
• /
• 제18권3호
• /
• pp.315-322
• /
• 2000

은행나무 줄기와 뿌리의 해부학적 관찰에서 횡단면의 가도관의 접선직경, 세포면적, 세포벽 두께 및 방사열에서 세포층수는 산성비의 pH가 낮아짐에 따라 감소되었다. 은행나무의 절선면에서 관찰한 줄기와 뿌리의 방추형 시원세포의 길이와 방사조직 시원세포의 길이는 산성비 처리에 의해 짧아지는 경향을 나타내었다. 곰솔의 줄기와 뿌리의 횡단면에서 가도관의 접선직경, 세포면적, 세포벽 두께 및 방사열에서 세포층수 역시 산성비 처리에 의해 pH가 낮아짐에 따라 감소되었다. 곰솔의 피층, 수와 목부의 면적은 산성비 처리에 의해 감소되었다. 따라서 산성비는 은행나무와 곰솔의 길이생장은 물론 형성층의 활동력을 감소시켜 2기목부의 분화를 둔화시키는 것으로 보인다.

• 한국산림과학회지
• /
• 제77권4호
• /
• pp.429-444
• /
• 1988

편백(扁栢) (Chamaecyparis obtusa)은 1924년(年) 일본(日本)에서 도입(導入)된 후(後) 한국(韓國) 남부지방(南部地方)의 주요조림종(主要造林種)으로 식재(植栽)되고 있다. 그러나 현존(現存)하는 편백림(扁栢林)의 대부분(大部分) 유령림(幼令林)에 속(屬)하고 있으며 임목(林木)의 다각적(多角的) 용도(用途) 개발(開發)이라는 최근(最近)의 추세(趨勢) 고려(考慮)할 때, 합리적(合理的)인 경영관리(經營管理)에 필요(必要)한 종합적(綜合的)인 정보구명(情報究明)이 시급(時急)한 과제(課題)라고 할 수 있다. 이러한 관점(觀點)에서 전남(全南) 장성군(長成郡) 삼서면(三西面) 식재(植栽)된 23년생(年生) 편백림(扁栢林)을 대상(對象)으로 83본(本) 표본목(標本木)을 선정대목(選定代木)하여 각종(各種) 수간장성인자(樹幹長成因子)들을 측정(測定)한 후(後) 정준상관분석법(正準相關分析法), 주성분분석법(主成分分析法) 및 인자분석법(因子分析法)을 적용(適用)하여 성장(成長) 특성(特性), 성장인자간(成長因子間)의 관계(關係), 잠재적(潛在的) 및 종합적(綜合的) 정보구명(情報究明)을 위하여 조사분석(調査分析)한 결과(結果)를 요약(要約)하면, 간재적(幹材積)과 질적성장인자(質的成長因子)의 정준상관분석(正準相關分析)에서 정준상관계수(正準相關係數) $0.988^{**}$이며, 정준변량(定準變量) 계수(系數)에서 비대성장인자(肥大成長因子)에서는 흉고직경(胸高直徑), 상장성인자(上長成因子)에서는 수고(樹高)가 유력(有力)한 인자(因子)로 밝혀 졌으며, 흉고직경(胸高直徑)과 수고(樹高)를 1조(組)로 선형(線形) 종합(綜合)한 정준변량(正準變量)과 간재적간(幹材積間)의 상관(相關)을 분석(分析)한 결과(結果)는 간재적((幹材積)에 대한 영향력(影響力)은 흉고직경(胸高直徑)이 수고(樹高)에 비(比)하여 높았다. 12개(個)의 수간(樹幹) 제성장인자(諸成長因子)들에 대(對)한 주성분(主成分) 분석결과(分析結果)에서 설정(設定)된 유효목표(有效目標) 85.00%에 합당(合當)하도록 채택(採擇)된 제(第)1~(第)2 주성분(主成分)까지의 누적기여율(累積奇與率)은 88.16%이며, 제(第)1, 제(第)2 주성분(主成分)은 각각(各各) "크기인자(因子)", "형상인자(形狀因子)"로 해석(解釋)되었다. 유효주성분(有效主成分) 각변량(各變量)에 대한 기여율(奇與率)은 수관직경(樹冠直徑), 지하고(枝下高) 및 망고(望高)를 제외(除外)한 모든 변량(變量) 정보(情報)가 87.00% 이상(以上)을 설명(說明)해 주었다. 상관행렬(相觀行列) 대각선요소(對角線要素)를 SMC로 하여 얻어진 고유치(固有値) 의(衣)해서 공통인자(共通因子)를 2개(個)로 정하였으며 $f^*_1$은 수간(樹幹) 비대성장계(肥大成長系)의 $f^*_1$은 상장성장수(上長成長系)의 형질인자(形質因子)의 잠재적인자(潛在的因子)로 해석(解析)되었다. 각종성장인자(各種成長因子)의 내재현상(內在現像)은 지하고(枝下高), 수관직경(樹冠直徑)을 제외(除外)한 공통성(共通性)이 78.62~98.30%의 높은 설명력(說明力)을 가진다. 공시목(供試木) 83본(本)은 인자득점(因子得點)의 표준편차(標準偏差)(1)를 반경(半徑)으로 한 원내(員內)의 표준목(標準木)은 중간형(中間型)으로 그리고 제(第) 1, 2, 3, 4 상한별(象限別)의 수간형질분류(樹幹形質分類)는 각각(各各) 비대(肥大), 수고성장(樹高成長)의 총합형(總合型), 세장형(細長型) 왜소형(矮小型) 및 단비형(短肥型) 등(等)의 5개유형(個類型) 분류(分類)할 수 있다.

• 펄프종이기술
• /
• 제35권4호
• /
• pp.68-74
• /
• 2003

Kenaf(Hibiscus cannabinus L.) cultivar, Tainung 2, had been grown for 152 days at the experimental farm of Jinju National University, Gajoa-dong, Jinju-si, Kyongnam, Korea. The planting, growth rate, fertilization and structural characteristics as well as the cultivation and growth characteristics of kenaf, and the product usage were investigated. The narrowest diameter at kenaf bottom was 10 mm, the widest 42 mm and the average about 28 mm, and the shortest height 150 cm, the tallest 480 cm and the average about 350 cm. The weight of a core fraction was 68.1％ and a bast fraction 31.9％. The weight ratio of core material to bast fiber was 2.31. The weight ratio of dry stem was 73.5％ and that of leaves 26.5％. The weight of dry plant produced in 1 $m^2$ was 1,467 g, and about 1,052 g of stem could be used for the commercial purpose, The application of fertilizers resulted in the increase of the growth rate of the diameter at plant bottom and the height. Bast fiber, phloem ray and cortex parenchyma cell were observed in bast, and vessel, wood fiber and ray in core.

• 한국유기농업학회지
• /
• 제6권1호
• /
• pp.127-132
• /
• 1997

This experiment was carried out to examine the effect of various functional materials such as bioceramic podwers, crushed shells and elvanites supplemented to the each substrate on the seedlings growth of rices. The rice seedlings were grown in pots filled with substrates supplemented with bioceramic podwers, crushed shells and elvanites. The growth of rice seedlings in terms of plant height, stem diameter, root length and leaf width, plant fresh and dry weight was promoted by adding the bioceramic powders (2 to 3g/kg), crushed shells (10g/kg) or elvanites (20 to 40g/kg). Plant height was also promoted by the adding of bioceramic powder from 16 days after treatment, whereas crushed shells and elvanites from 10 days after treatment. Especially, root growth was greatly influenced by bioceramic powder, whereas the shoot growth(leaves and stem) was stimulated by the crushed shells and elvanites supplemented into each substrate. In the field, plant growth in terms of plant height, leaf length and leaf width were also influenced by crushed shells and elvanites at 74 days after treatment. The growth of rices in terms of tiller number, spikelets, panicles and spikelets/panicle was incresed by adding the crushed shells and elvanites from 100 to 200g per m2.

• 한국자원식물학회지
• /
• 제25권6호
• /
• pp.745-752
• /
• 2012

Compared to wide ranges of genetic variation of natural populations, very limited Miscanthus cultivar has been released. This study was the first report on the development of Miscanthus cultivar by means of radiation breeding. Seeds of M. sinensis were initially exposed to gamma rays of 250 Gy for 24 h, generated from a $^{60}Co$ gamma-irradiator. The irradiated seeds were sown and then the highly tiller-producing mutants were selected for this study. Biomass-related parameters including tiller number, plant height, stem diameter, and leaf number were measured. Ploidy level and internal transcribed spacer (ITS) were investigated to characterize the mutants compared to wild type (WT) Miscanthus. Plant height and tiller number were negatively related, where multi-tillering mutants were relatively short after 4 month growth. However stem diameter and leaf number were greater in mutants. All the materials used in this study were diploid, implying that the mutants with greater tiller numbers and stem diameter were not likely related to polyploidization. Based on the sequence of ITS regions, the mutants demonstrated base changes from the gamma irradiation where G+C content (%) was decreased in the ITS1, but increased in ITS2 when compared to WT sequence. ITS2 region was more variable than in ITS1 in the mutants, which collectively allows identification of the mutants from WT. Those mutants having enhanced tillers and allelic variations might be used as breeding materials for enhanced biomass-producing Miscanthus cultivars.

• 농업생명과학연구
• /
• 제50권5호
• /
• pp.1-9
• /
• 2016

Plant growth and development strongly influenced by light quantity and its spectral composition. Young tomato plants were cultivated in growth cabinets under artificial light provided by red and blue light emitting diodes(LEDs) during 12 hours, then plants were exposed to monochromatic ultraviolet, blue, green and red lights as an end-of-day(EOD) treatment during 4 hours to study their effect on plant growth parameters. EOD lighting from various LEDs increased total fresh and dry weights as well as assimilation area compared to those in control. Blue light increased stem height, internode length and stem diameter. Monochromatic UV-A light reduced stem elongation, highly increased stomatal conductance. Compactness and health index of young tomato plants were increased in UV-A and red light treatments.

• 한국산림과학회지
• /
• 제94권5호통권162호
• /
• pp.313-320
• /
• 2005

This study was performed in a 38-year-old Mongolian pine (Pinus sylvestris L. var. mongolica Litvin) plantation in northeast China. Data were collected from 5 sample trees with different canopy position ranging in DBH from 14.6 cm to 23.8 cm. Sawn speciments that included the biggest knot were taken from the stem below the living crown. Number and distribution of knots per whorl below the living crown were studied by relative height below living crown (RHBC). A linear model expressed as function of whorl age (AGE), whorl height ($H_k$) and the stem diameter at which the whorl was located ($D_k$) was developed to predict the knot diameter and angle. The number of annual rings in four periods and the width of respective zone alone stem were used as dependant variables to analyze the knot develop phases. In average, the number of years from branch birth to ceased forming rings was 7.8, the branches remained alive for 4.2 years without forming annual rings, and branches were occluded 14.4 years after their death. These results can provide abundance branch and knot information so as to describe current and past tree growth dynamic of Mongolian pine plantation.