Korean Journal of Agricultural and Forest Meteorology (한국농림기상학회지)

Korean Society of Agricultural and Forest Meteorology (한국농림기상학회)
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Effect of Meteorological Factors on Evapotranspiration Change of Cnidium officinale Makino

기상요인이 일천궁의 증발산량 변화에 미치는 영향

  • 서영진 (경상북도농업기술원 봉화약용작물연구소) ;
  • 남효훈 (경상북도농업기술원 봉화약용작물연구소) ;
  • 장원철 (경상북도농업기술원 봉화약용작물연구소) ;
  • 김종수 (경상북도농업기술원 유기농업연구소) ;
  • 이부용 (대구가톨릭대학교 환경과학과)
  • Received : 2018.09.17
  • Accepted : 2018.12.04
  • Published : 2018.12.30
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Abstract

Evapotranspiration (ET) information is needed for many applications in agricultural and environmental resource management because crop yields, plant growth and physiological characteristics are primarily water limited. This study was conducted to evaluate the diurnal change of ET using electronic weighing lysimeter and to determine whether the ET of Cnidium officinale Makino could be manipulated through meteorological factors such as solar radiation, windy conditions and air temperature etc., Pot has a diameter of 35 cm and an height of 38 cm. A disturbed soil of sandy loam (coarse, mixed, mesic family of Dystric Fluventic Eutroudepts) within lysimeter has a mass of approximately 40.0 kg. In 2017, 10-minute recordings of data were used for measuring actual ET, and also evaluating a relationship between ET and meteorological factors during from 2 Aug. to 6 Aug. The maximum daily ET of Cnidium officinale was $44.04{\pm}3.949g$ per hour in lysimetric measurements. Diurnal changes of ET was highly correlated with solar radiation ($r^2=0.7778$) and followed by wind speed ($r^2=0.6400$). But on the other hand, air temperature was not consistent with ET ($r^2=0.2260$). This results imply that ET of Cnidium officinaele seems to be mainly governed by radiation energy in clear days, and approximately 40% of solar radiation is likely to be converted into ET. Therefore, weighing lysimeter can be used to accurately estimate actual ET and is expected to attract a great deal of attention to reliable application of water management in agriculture.

본 연구에서는 라이시미터를 이용하여 일천궁의 증발산량을 관측하였고, 그 자료를 분석하여 기상요소와 증발산량과의 관계를 조사하였다. 맑은 날이 지속된 4일간 라이시미터에서 관측된 증발산량은 일사량의 약 40%에 해당하는 것으로 관측되었으며, 증발산량 변화의 형태는 일출이 시작됨과 동시에 증가하였고 일몰과 함께 급격히 감소하여 일사량은 일천궁의 증발산량에 영향을 주는 중요한 인자로 나타났고 야간의 강한 풍속은 증발산량을 증가시켰으며, 일사량과 풍속이 증발산량 변화에 가장 큰 영향을 주는 요인이었다. $600W/m^2$ 이상의 일사량에서는 일천궁의 증발산량 증가가 없어 일천궁을 안정적으로 재배하기 위해서 잎 표면으로 입사되는 일사량의 조절이 필요한 것으로 조사되었다. 따라서 라이시미터는 야외에서 증발산량을 간단하면서도 정확하게 관측할 수 있는 방법임을 확인하였고, 추후 식물의 수분생리 및 적정 재배환경 구명에도 매우 유용할 것으로 사료된다.

Keywords

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Fig. 1. Diagram (a) and photo (b) of lysimeter for evapotranspiration measurements.

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Fig. 2. Daily changes of air temperature (a), wind speed (b) and solar radiation (c) during the experiment period.

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Fig. 3. Comparisons of evapotranspiration of Cnidium officinale Makino from lysimeter and air temperature during the experiment period.

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Fig. 4. Comparisons of evapotranspiration of Cnidium officinale Makino from lysimeter and wind speed during the experiment period.

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Fig. 5. Comparisons of evapotranspiration of Cnidium officinale Makino from lysimeter and solar radiation during the experiment period. a, b, c and d are peaks of solar radiation.

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Fig. 6. Relationship between evapotranspiration of Cnidium officinale Makino from lysimeter and air temperature.

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Fig. 7. Relationship between evapotranspiration of Cnidium officinale Makino from lysimeter and wind speed.

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Fig. 8. Relationship between evapotranspiration of Cnidium officinale Makino from lysimeter and solar radiation.

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