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AN IMPACT COEFFICIENT OF EVAPORATIVE DEMAND ON PLANT WATER BALANCE

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概要 A coefficient was newly defined to evaluate the impact of evaporative demand on plant water balance, which we propose to call "impact coefficient (Imp)". Imp varied from 0 to 1 with increase in ratio ...(G_S/G_<AV>) of tomatal conductance (G_S) to leaf boundary layer conductance (G_<AV>), and the impact of evaporative demand (ED_A) was evaluated by Imp×ED_A. Imp became lower in small leaves plants and CAM plants which are adapted to sunny, hot and dry conditions in desert regions. Their lower Imp's bringing smaller impacts of ED_A can be considered reasonably to contribute their adaptabilities to the desert conditions. Furthermore, ΔED_A and ΔImp triggered dynamics of plant water relations through the water balance, and midday stomatal depression on a fair day was attributed to larger ΔED_A and ΔImp but not to higher transpiration rate. Thus, environmental effects on plant water relations can be confirmed quantitatively in terms of the impact coefficient of evaporative demand.続きを見る

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登録日 2009.04.22
更新日 2020.10.13