Stems and Root Systems just after the First Overwintering of Kudzu (Pueraria lobata OHWI) Stands Differing in Spacing

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  • 栽植間隔の異なるクズ(Pueraria lobata OHWI)群落の第1回越冬直後のほふく茎と根群
  • 栽植間隔の異なるクズ(Pueraria lobata Ohwi)群落の第1回越冬直後のほふく茎と根群〔英文〕
  • サイショク カンカク ノ コトナル クズ Pueraria lobata Oh

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Stem length per unit area, the number of rooted nodes per unit area, and the magnitude of root systems etc. were compared among kudzu stands differing in spacing (40,80 and 120cm spacings) just after overwintering (March 1-10). Forty-nine to 60 one-square meter quadrats were placed in the kudzu stands and then stems, crowns and rooted nodes were sampled within each quadrat. Despite greater living stem length per unit area in 120cm spacing than in 40cm spacing, the number of rooted nodes per unit area was smaller in the former than in the latter. These results can be attributed to a higher proportion of rooted nodes to total number of nodes in the closer spacings and a greater number of nodes per unit area in the closer spacings due to a greater number of nodes per unit living stem length. Thinner stems, shorter stem length and smaller number of nodes per plant, and smaller root systems on crowns and rooted nodes were produced in the closer spacings, suggesting that individual plants were smaller due to more severe interplant competition in the closer spacings. These results indicate that a dense network of stems and root systems is formed in the close spacing, but the stem and root system are poorer than in the wide spacing.

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