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| 파종상에 있어 피음처리 영향 The Influence of Shading on the Growth of Seedling Crown |
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| 글쓴이 : 관리자
날짜 : 08-06-19 18:23
조회 : 9756
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무기적 환경요인이 잣나무 유묘의 생육에 미치는 영향에 관한 연구(I) -파종상에 있어 피음처리 영향- Effect of Inorganic Environmental Factors on the Growth of Pinus koraiensis Seedlings(I) -The Influence of Shading on the Growth of Seedling Crown on the Seed Bed- <한국임학회지 73:43-54 Jour. Kor. For. Soc. 73:43-54 1986> Author Young Chai Kim yckim@khu.ac.kr
파종상에서 피음처리한 잣나무 유묘의 상대광도별 생장관계를 분석한 결과이다. 1) 신장생장에 있어서 지상부는 상대광도 37% 구에서, 그리고 그 외의 기관은 100% 구에서 가장 크게 나타났다. 광도가 지상부 및 지하부, 묘장, 직경생장에 미치는 영향은 기여율 9.3%, 26.2%, 21.4%, 48.7%였다. 2) 엽령에 따라 엽속 및 엽장의 변화는 크게 나타났다. 엽속은 1년생 경우 광도가 높을수록, 그리고 2년생은 샹대광도 37% 구에서 가장 많았다. 엽장은 각 처리간에 큰 차가 없었다. 이때 광도가 미치는 엽속 및 엽령에 대한 기여율은 각각 3.9%, 27.8%였고 엽장은 1.5%였다. 3) 중량생장은 샹대광도 100% 구에서 가장 컸으나 점차 광도가 낮아짐에 따라 감소하는 경향이었다. 광도가 미치는 기여율은 생중량 및 건중량의 경우 38%와 7.6%였고, 엽건중량은 13.18%로 나타났다. 4) T/R율은 상대광도가 점차 낮아질수록 증가하는 경향이었다. 이때 광도가 T/R에 미치는 기여율은 7.0%였다. 5) 엽건중량과 타기관의 생장량 간에는 정의 상관을 인정할 수 있었고 이들 간에는 직성회귄 관계에 있음도 알 수 있었다.
This study was carried out to investigate the influence of light intensity on the growth of Pinus koraiensis seedlings. The seedlings were grown under four different relative light intensities: 100%, 63%, 37%. and 19% of full sunlight by covering with saran screen on seed bed.
1) The highest shoot elongation was found at 37% in relative light intensity (RLI) plot, and the best growth in root, seedling length and diameter increment appeared at 100% on RLI plot. Contribution rates of shading to growth in shoot elongation, root growth. seedling length, and diameter increment were 9.3%, 26.2%, 21.0%, and 48.7%, respectively. 2) The greatest number of one-year-old needle fascicle was found at 100% in RLI plot, whereas that of two-year-old needle fascicle appeared at 37% in RLI plot. The contribution rate of the light intensity to number of needle fascicle was 3.9%t and factor of leaf age contributed to number of needle fascicle In 27.8%. The length of needles grown under different light intensities varied with needle ages. The longest length of new needles appeared at 37% in RLI plot, but old needles were not clear in influence of light intensity. The contribution rate to needle length by the light intensity was 2.5%. 3) The heaviest value of the fresh and dry weight of seedlings appeared at 100% of RLI plot then decreased with light intensity. The contribution rates to fresh and dry weight by the shading were 38% and 7.6%. respectively. 4) The largest value of the dry weight of needles appeared at 100% of RLI plot and then decreased with light intensity. The contribution rates to dry weight of needles by the light intensity was 13.18%. 5) The values of T/R ratio increased with decreasing light intensity and the contribution rate was 7.0%. 6) Positive correlation and linear regressions were recognized between dry weight of leaf and other factors (dry weight of shoot, root, seedling and diameter increment).
Key words: Pinus koraiensis, relative light intensity, saran screen, shading
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