The effects of water stress on transpiration and water uptake of Sabina vulgaris Ant. and Juniperus chinensis var. kaizuka Hort.

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  • 水ストレスが臭柏（Ｓａｂｉｎａ　ｖｕｌｇａｒｉｓ　Ａｎｔ．）とカイヅカイブキ（Ｊｕｎｉｐｅｒｕｓ　ｃｈｉｎｅｎｓｉｓ　ｖａｒ．ｋａｉｚｕｋａ　Ｈｏｒｔ．）の蒸散と吸水特性に与える影響
  • ミズ ストレス ガ シュウハク Sabina vulgaris Ant ト カイヅカイブキ Juniperus chinensis var kaizuka Hort ノ ジョウサン ト キュウスイ トクセイ ニ アタエル エイキョウ

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Abstract

Saplings of Sabina vulgaris Ant. and Juniperus chinensis var. kaizuka Hort. were grown under two levels of soil moisture conditions, pF1.8 and pF4.2. Transpiration rate, stomatal conductance and water potential were measured under natural condition. Cuticular and stomatal transpiration rates were measured by a cut branch method. Drought stress decreased the stomatal conductance of S. vulgaris and hastened stomata closure at high water content of needle. High ability of water absorption of S. vulgaris was secured by the high gradient of water potential between needle and basal part of stem. On the other hand, high rate of transpiration was realized under high water supply. J. chinensis var. kaizuka showed a significant reduction of both stomatal and cuticular transpiration rates by the effect of drought stress. Stomatal closure was occurred at relatively high water content of needle. Although there is no difference of the gradient of water potential in top part of J. chinensis var. kaizuka between the treatments pF1.8 and pF4.2, the gradient of water potential under ground part became significantly low in the treatment pF4.2.

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