The effects of water stress on root growth 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．）の地下部の発達に与える影響
  • 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 チカブ ノ ハッタツ ニ アタエル エイキョウ

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Saplings of Sabia vulgaris Ant. and Juniperus chinensis var. kaizuka Hort. were grown under two levels of soil moisture condition, pF1.8 and pF4.2, and their top and root growth were measured. Drought stress prohibited the shoot elongation of S. vulgaris and promoted the growth of root system vertically. As a result, the T/R ratio of new growth decreased and the range of root system spread deeper as soil became dry. Both the top and the root of J. chinensis var. kaizuka were prohibited their growth under dry condition with the same T/R ratio of new growth as under wet condition. Most of the root system of J. chinensis var. kaizuka was distributed within 10 cm depth from the ground surface irrespective of the soil moisture conditions. The vertical elongation of root system without branching was the notable growth feature of S. vulgaris.

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