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| 생육환경 요인에 따른 생장해석적 연구 Growth Analysis of Seedlings under Various Relative Light Intensities and Planting Densities |
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| 글쓴이 : 관리자
날짜 : 08-06-04 17:47
조회 : 9946
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잣나무 묘목의 생육환경 요인에 따른 생장해석적 연구 A Study on the Growth Analysis of Pinus koraiensis Seedlings under Various Relative Light Intensities and Planting Densities <한국임학회지 78(3):314-322 Jour. Kor. For Soc. 78(3):314-322 1989> Author Young Chai Kim yckim@khu.ac.kr
물질생산적 측면에서 잣나무에 대한 환경 및 식재밀도를 달리한 생육조건과 그에 따른 묘목의 생장관계를 추적하고 생육환경의 개선방안을 위한 양묘생산의 기초확립을 목적으로 광도 및 식재밀도를 각각 4개 수준으로 구분 생육시킨 잣나무 묘목(2-2)을 대상으로 영국계의 생장해석법을 도입, 이들에 대한 묘목의 상대생장률과 순동화률 등을 산출하였다. 또한 상대생장율과 순생장율 간의 상관관계를 통계적으로 비교 분석하였던 바 잣나무 묘목의 생육 환경개선방안의 모색이 요구되었기에 그 결과를 요약하면 다음과 같다.
1. 묘목의 건중량생장의 변화 양상은 각 처리구간 공히 생육초기에는 큰 차이가 없었으나 생육후기에는 차이를 나타태고 광도가 높을수록, 그리고 식재밀도가 낮을수록 증가하여 광조건의 변화가 물질생산에 미치는 영향에 주요한 변수로 작용되었다. 2. 엽면적생장은 상대밀도 63%구가 가장 컸고, 그보다 광도가 높거나 낮아질수록 점차 감소하였다. 상대광도 19%구가 가장 적게 나타났다. 3. 상대생장률(RGR)은 상대광도 63%구에서 6x6/㎡(36본)구의 6월 생장이 최대였고, 상대광도 19%구에서 12x12/㎡(224본)구의 9월 생장이 최소치를 나타냈다. 4. 순동화률(NAR)은 생육초기에는 감소하다가 8월과 9월을 기점으로 증가하였으며 상대광도 100%의 6x6/㎡(36본)구에서 6월의 생장이 최대치를, 그리고 상대광도 19%구에서 12×12= 144종/㎡ 구의 9월 생장이 최소치를 나타냈다. 5. 상대생장률과 순동화률 간에는 모두 고도의 유의성이 인정되었으며 이들은 정의 상관관계에 있었다.
For the improvement of nursery condition and the study of eco-physiological characteristics of Pinus koraiensis (2-2) seedlings, the primary productivity was investigated and the growth characteristics and their correlationship were analyzed from May to September in 1987. Seedlings used in this study were grown at the nursery of Experimental Forests of Kyung Hee University. The installation of experimental plots were divided into control plot (l00%). 63%, 37% and 19% relative light intensity. and each relative light intensity plots were split into 15x15/㎡, 12x12/㎡, 9x9/㎡ and 6x6/㎡ planting density by randomized block design method. To take into account the edge effect of plant population, material were selected from each plot by random sampling at 30 days interval. Each sampled material was divided into leaf and stem dried in a drying oven at the temperature of 85℃ until it had constant weight and weighed. and leaf area was surveyed. Growth analysis for PGR and NAR was done by Blackman method and correlation coefficient were investigated between RGR and NAR by analyzing the dry matter production and growth characteristics of the material, cultivated on the experimental nursery under the condition of different treatment the obtained results were as follows.
1. The increasing rate of dry matter was similar at early stage of growth, but not at late stage. 2. Leaf area growth was the maximum value at 63% relative light intensity and the minimum at 19% RLI. 3. The value of RGR was the highest on the June under 6x6/㎡ planting density in 63% relative light intensity, the lowest on September under 12x12㎡ of 19% relative light intensity. 4. The change NAR decreased in early stage of growth. while it increased on August and September. The value of RGR on June under 6x6/㎡ planting density in 100% light intensity was the highest, and on September under 12x12/㎡ planting density in 19% relative light intensity was the lowest. 5. Regression and correlation between RGR and NAR showed significantly positive.
Key words: Pinus koraiensis, dry matter, planting density, leaf area, RLI, RGR, NAR
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