Effects of Light, Temperature, Water Changes on Physiological Responses of Kalopanax pictus Leaves(II) - Characteristics of Stomatal Transpiration, Water Efficiency, Vapor Pressure Deficit of Leaves by the Light Intensity -

광, 온도, 수분 변화에 따른 음나무 엽의 생리반응(II) - 광도변화에 따른 기공증산, 수분이용효율, 수증기압결핍 -

This research was carried out to elucidate the characteristics of stomatal transpiration, water efficiency, vapor pressure deficit of leaves by the light intensity Kalopanax pictus leaves. The results obtained are summarized as follows: 1. In the upper leaves of Kalopanax pictus seedlings, the stomatal transpiration rate increased continuously with increasing light intensity, but in the middle and lower leaves. it was saturated at $100{\mu}mol\;m^{-2}S^{-1}$. At the light saturated point. the stomatal transpiration rate was in the following order: the upper ($1.29mmol\;H_2O\;m^{-2}S^{-1}$) middle ($0.56mmol\;H_2O\;m^{-2}S^{-1}$) lower leaves ($0.31mmol\;H_2O\;m^{-2}S^{-1}$). 2. In the upper leaves, water use efficiency rapidly increased to $600{\mu}mol\;m^{-2}S^{-1}$, and then decreased. In the middle and lower leaves, it increased to $400{\mu}mmol\;m^{-2}S^{-1}$, and then showed a constant values. 3. The vapor pressure deficit (VPD) in according to leaf positions was linearly decreased with increasing photosynthetic photon flux density (PPFD).

1. 상엽의 기공증산속도는 광도가 증가함에 따라 계속적인 증가를 나타냈지만, 중엽과 하엽은 광도 약 $100{\mu}mol\;m^{-2}S^{-1}$ 이상에서 기공증산의 포화가 나타났다. 포화광도 $1,200{\mu}mol\;m^{-2}S^{-1}$)에서 기공증산은 상엽($1.29mmol\;H_2O\;m^{-2}S^{-1}$) > 중엽($0.56mmol\;H_2O\;m^{-2}S^{-1}$) > 하엽($0.31mmol\;H_2O\;m^{-2}S^{-1}$)순위였다. 2. 엽의 수분이용효율은 광도 $600{\mu}mol\;m^{-2}S^{-1}$ 까지 빠르게 증가하다가 그 이상의 광도에서는 감소한 반면, 중엽과 하엽은 광도 $400{\mu}mol\;m^{-2}S^{-1}$ 까지는 증가하였지만 그 이상의 광도에서는 증가를 보이지 않았다. 3. 엽의 광도증가에 따른 수증기압결핍은 직선적으로 감소하는 경향을 나타냈다.