Effects of different site conditions on water use in Pinus densiflora Sieb. et Zucc.

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  • 生育立地の違いがアカマツ（Ｐｉｎｕｓ　ｄｅｎｓｉｆｌｏｒａ　Ｓｉｅｂ．ｅｔ　Ｚｕｃｃ．）樹体における水利用調節に与える影響
  • セイイク リッチ ノ チガイ ガ アカマツ Pinus densiflora Sieb et Zucc ジュタイ ニ オケル ミズリヨウ チョウセツ ニ アタエル エイキョウ

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Abstract

To elucidate the differences in whole-tree water use of Pinus densiflora Sieb. et Zucc. growing in different site conditions, we measured the stomatal conductance, the transpiration rate, and the leaf water potential in leaf. The sap flow velocity and the change of diameter also were measured in branch and stem. It was suggested that pine tree of the upper part of the slope, growing under dry condition controlled the stomatal openness and reduce the water loss in response to soil drying, according to the increase of hydraulic resistance in branch. The water storage of branch and stem partially compensated the temporal water storage. While pine tree of the lower part of the slope, growing on relatively moist condition maintained the high stomatal conductance and transpired irrespective of soil drying.

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