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2017 Vol.26, Issue 4 Preview Page
Development of A Three-Variable Canopy Photosynthetic Rate Model of Romaine Lettuce (Lactuca sativa L.) Grown in Plant Factory Modules Using Light Intensity, Temperature, and Growth Stage

광도, 온도, 생육 시기에 따른 식물공장 모듈 재배 로메인 상추의 3 변수 군락 광합성 모델 개발

Dae Ho Jung1
,
Hyo In Yoon1
,
Jung Eek Son1*
정 대호1
,
윤 효인1
,
손 정익1*
1Department of Plant Science and Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
1서울대학교 식물생산과학부
*Corresponding author: sjeenv@snu.ac.kr
30 November 2017. pp. 268-275
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Abstract

The photosynthetic rates of crops depend on growth environment factors, such as light intensity and temperature, and their photosynthetic efficiencies vary with growth stage. The objective of this study was to compare two different models expressing canopy photosynthetic rates of romaine lettuce (Lactuca sativa L., cv. Asia Heuk romaine) using three variables of light intensity, temperature, and growth stage. The canopy photosynthetic rates of the plants were measured 4, 7, 14, 21, and 28 days after transplanting at closed acrylic chambers (1.0 × 0.8 × 0.5 m) using light-emitting diodes, in which indoor temperature and light intensity were designed to change from 19 to 28? and 50 to 500 μmol·m-2·s-1, respectively. At an initial CO2 concentration of 2,000 μmol·mol-1, the canopy photosynthetic rate began to be calculated with CO2 decrement over time. A simple multiplication model expressed by simply multiplying three single-variable models and a modified rectangular hyperbola model were compared. The modified rectangular hyperbola model additionally included photochemical efficiency, carboxylation conductance, and dark respiration which vary with temperature and growth stage. In validation, R2 value was 0.849 in the simple multiplication model, while it increased to 0.861 in the modified rectangular hyperbola model. It was found that the modified rectangular hyperbola model was more suitable than the simple multiplication model in expressing the canopy photosynthetic rates affected by environmental factors (light Intensity and temperature) and growth factor (growth stage) in plant factory modules.

Keywords
modified rectangular hyperbola model
regression model
simple multiplication model
three-variable model
validation

광도와 온도 같은 환경 요인에 의해 광합성 속도가 변 화하기도 하며, 생육 시기에 따른 광합성 효율의 변화가 수반되기도 한다. 본 연구에서는 흑로메인 상추(Lactuca sativa L., Asia Heuk romaine)를 이용하여 광도와 온도, 생육 시기에 따른 군락 광합성 속도를 표현하는 두 모 델을 구축하고 비교하는 것을 목표로 하였다. 군락 광합 성은 정식 후 4, 7, 14, 21, 28 일차 상추를 아크릴 챔 버(1.0 × 0.8 × 0.5m)에 넣어 측정하였으며, 이 때 챔버 내부의 온도는 19°C에서 28°C까지 변화시켰고 광원은 LED를 이용하여 50에서 500μmol·m-2·s-1까지 변화시키며 실험하였다. 챔버 내부의 초기 이산화탄소 농도는 2,000μmol·mol-1로 설정하였으며, 시간에 따른 이산화탄 소 농도의 변화율을 이용하여 군락 광합성 속도를 계산 하였다. 각 환경요인을 표현하는 3개 식을 곱하여 만든 단순곱 모델을 구성하였다. 이와 동시에 온도와 생육 시 기에 따라 변화하는 광화학 이용효율과 카르복실화 컨덕 턴스, 호흡에 의한 이산화탄소 발생 속도를 포함하는 수 정된 직각쌍곡선 모델을 구성하여 단순곱 모델과 비교하 였다. 검증 결과 단순곱 모델은 0.849의 R2 값을 나타내 었으며, 수정된 직각쌍곡선 모델은 0.861의 R2 값을 나 타내었다. 수정된 직각쌍곡선 모델이 단순곱 모델에 비 해 환경 요인(광도, 온도), 생육 요인(생육 시기)에 따른 군락 광합성 속도를 표현하는 데 더욱 적합한 모델인 것으로 판단하였다.

키워드
수정 직각쌍곡선 모델
회귀 모델
단순곱 모델
3변수 모델
검증
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Information
  • Publisher :The Korean Society for Bio-Environment Control
  • Publisher(Ko) :(사)한국생물환경조절학회
  • Journal Title :Protected Horticulture and Plant Factory
  • Journal Title(Ko) :시설원예ㆍ식물공장
  • Volume : 26
  • No :4
  • Pages :268-275
  • Received Date : 2017-09-20
  • Revised Date : 2017-09-29
  • Accepted Date : 2017-10-09
  • DOI :https://doi.org/10.12791/KSBEC.2017.26.4.268
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