温室内における蒸散要求度とそれがキュウリ植物の蒸散・葉コンダクタンスに及ぼす影響の季節変動

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タイトル別名
  • Seasonal Changes in Greenhouse Evaporative Demand and Its Effects on Transpiration and Leaf Conductance of Cucumber Plant:
  • オンシツ ナイ ニ オケル ジョウサン ヨウキュウド ト ソレ ガ キュウリ ショクブツ ノ ジョウサン ・ ハ コンダクタンス ニ オヨボス エイキョウ ノ キセツ ヘンドウ : チョウオンパシキ コガタ パン ジョウハツケイ オ モチイタ ジッケン
  • Experiments Using a Supersonic Pan-Evaporimeter
  • －超音波式小型パン蒸発計を用いた実験－

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Long-term seasonal changes in evaporative demand and its association with micro-meteorological elements were examined using a supersonic pan-evaporimeter in a greenhouse from June 6, 2009 to December 31, 2011. Daily pan evaporation rate was strongly correlated with the reference evapotranspiration rate, which could be widely used as an index of evaporative demand. Cucumber plants (Cucumis sativus L.) were grown during different seasons (spring, summer, autumn, and winter), and the effects of evaporative demand on transpiration and leaf conductance (leaf gas exchange characteristics) were analyzed on an hourly basis. A positive linear relationship between the leaf gas exchange characteristics and evaporative demand was observed; however, the impact of evaporative demand on the gas exchange characteristics differed between seasons. Furthermore, an excessive plant evaporative demand was observed during the daytime in the summer season.

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