Journal of the Korean Institute of Landscape Architecture (한국조경학회지)

The Korean Institute of Landscape Architecture (한국조경학회)
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Effect of Light Intensity on the Growth Responses of Three Woody Plants for Indoor Landscaping

실내녹화용 목본식물 3종의 초기 생육반응에 미치는 광량의 영향

  • Kwon, Kei-Jung (Major in Horticulture, Graduate School, Chungbuk National University) ;
  • Park, Bong-Ju (Dept. of Horticultural Science, Chungbuk National University)
  • 권계정 (충북대학교 대학원 원예학전공) ;
  • 박봉주 (충북대학교 원예과학과)
  • Received : 2017.10.12
  • Accepted : 2017.11.29
  • Published : 2018.02.28
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Abstract

The purpose of this study was to investigate the effects of light intensity on the initial growth response of three woody plants for indoor landscaping; Ardisia pusilla, Clusia rosea and Fatsia japonica. The plants were planted in 10cm pots, the light intensities used were of four levels-15, 30, 60, $120{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ PPFD-and light irradiation time was set to 12/12 (day/night). Growth responses including plant height, leaf length, leaf width, chlorophyll fluorescence (Fv/Fm), SPAD and Hunter values were measured at 4-week intervals, and shoot weight and root weight of fresh and dry plants were measured after completion of the experiment. Fatsia japonica tended to show greater leaf length and leaf width as light intensity became greater, while other plants did not show any significant differences at different light intensities. The Fv/Fm value of the Ardisia pusilla was found to be stressed at 60 and $120{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$, while the Fv/Fm values were within normal range with other plants or at other light intensity levels to show no stress. Only Clusia rosea showed significantly different SPAD values at $120{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$, and there was no significant SPAD value difference found with other plants or at other light intensity levels. While Hunter values of the Ardisia pusilla did not show any significant differences at any light intensity levels, Clusia rosea and Fatsia japonica showed specificity in L, a and b values at 60 and $120{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$, respectively. Ardisia pusilla showed a big stem growth at $120{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$, and Clusia rosea showed a steady growth at 60 and $120{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$.

본 연구는 광량이 산호수(Ardisia pusilla), 크루시아(Clusia rosea), 팔손이(Fatsia japonica) 목본식물 3종의 초기 생육 반응에 미치는 영향을 구명하고자 수행하였다. 목본식물 3종을 10cm 포트에 식재한 다음, 광량 15, 30, 60, $120{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ PPFD 4수준으로 광조사 시간은 12/12(명기/암기)로 설정하여 120일 동안 실시하였다. 4주 간격으로 초고, 엽장, 엽폭, 엽록소형광(Fv/Fm), SPAD, Hunter 값의 생육측정과 실험 종료 후 식물체 지상부와 지하부의 생체중과 건조중을 측정하였다. $120{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$에서 실험기간동안 초고, 엽면적, 지상부와 지하부의 생체중과 건조중 값이 가장 크게 나타났다. 팔손이는 광량이 높을수록 엽장, 엽폭이 컸으며, 그 밖의 식물에서는 광량에 따른 유의적인 차이가 나타나지 않았다. 산호수의 Fv/Fm 값은 60, $120{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$에서 광량에 대한 스트레스를 받는 것으로 나타났으나, 그 밖의 식물과 광량에서는 Fv/Fm는 모두 정상 범위로 나타나, 스트레스를 받지 않았다. SPAD값은 $120{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$에서 크루시아만 유의적인 차이를 보였으며, 그 밖의 식물과 광량에서는 유의적인 차이가 나타나지 않았다. 산호수의 Hunter 값은 모든 광량에서 유의적인 차이가 없었으며, 크루시아는 $60{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$에서, 팔손이는 $120{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$에서 L, a, b값에 특이성이 나타났다. $120{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$에서 산호수 줄기의 성장 폭이 컸으며, 크루시아는 60과 $120{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$에서 지속적인 성장을 보여, 적정수준의 초고를 유지하기 위해서 이들은 $60{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$이하의 광량이 필요할 것으로 판단된다.

Keywords

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