Diurnal and Seasonal Variations of Stomatal Conductance in a Secondary Temperate Forest.

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  • 落葉・常緑広葉樹から構成される二次林の気孔コンダクタンスの日変化と季節変化
  • オチバ ジョウ リョク コウヨウジュ カラ コウセイ サレル 2ジリン ノ キコウ コンダクタンス ノ ニチヘンカ ト キセツ ヘンカ

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Abstract

Diurnal and seasonal variations of stomatal conductance were observed for six tree species consisting of a warm-temperate secondary forest. Jarvis-type stomatal conductance model was used to derive environmental factors affecting for the stomatal conductance. Sunlit leaves (those exposed to short-wave radiation) provided the highest rate in terms of both magnitude and variability in both diurnal and seasonal variations of stomatal conductance. While shaded leaves (those shaded by sunlit leaves) performed only small conductance and slight variations. In consideration of distinctive characters for sunlit and shaded trees in the responses of stomatal conductance to light intensities, the light response curves were applied for each tree species. They illustrated the maximum stomatal conductance of sunlit leaves much higher light saturation point than those of shaded leaves. Nevertheless, shaded leaves could be reached their maximum points of stomatal conductance by using just small light intensities (large quantum yield), whereas sunlit plant needed much light intensity to reach the maximum.<BR>The statistical analysis of the model usefulness testing (F-test) was used to reduce any insignificant factors from the Jarvis-type model, due to numbers of input variables causing inconvenient experiment. It resulted that in this site soil water potential was not much significant. Therefore, the stomatal conductance were finally estimated by using only three environmental variables composed of photosynthesis photon flux density (PPFD), air temperature, and water vapor pressure deficit (VPD) .<BR>For deciduous plant (Q. serrata), new shooting leaves increased stomatal conductance sharply until reaching the maximum in two months after full leaf expansion. After that, they gradually declined as leaf senescence. Leaves shooting in different years of three evergreen species had distinct difference in stomatal conductance from March through May. These results supposed that leaf age effect should be included in the stomatal conductance model.

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