台木の違いがブドウサンショウの枯死率と生長に及ぼす影響(栽培管理・作型)  [in Japanese] Effects of Rootstock on Tree Mortality Rate and Growth in Young Japanese Pepper(Zanthoxylum piperitum (L.)DC.)(Crop Production & Cropping Type)  [in Japanese]

ブドウサンショウの接ぎ木後の生存率向上と早期樹冠拡大を目的にイヌザンショウ, フユザンショウおよびカラスザンショウ台木による枯死率と樹の生育差を比較検討した.枯死率はフユザンショウおよびカラスザンショウ台に比ベイヌザンショウ台で明らかに高く, イヌザンショウ台では定植から3年後に全て枯死した.定植5年後の樹容積はカラスザンショウ台がフユザンショウ台の約2倍であった.カラスザンショウ台で顕著な台勝ち現象がみられたが, フユザンショウ台では穂・台木間に幹肥大のアンバランスはなかった.1樹当たり花房数はカラスザンショウ台に比ベフユザンショウ台で著しく多かった.

Effects of rootstocks on tree mortality rate and canopy volume expansion in young Zanthoxylum piperitum (L.) DC. f. inerme Makino (Budousanshou) Japanese pepper tree were compared among Z. schinifolium Sieb. et Zucc. (Inuzanshou), Z. alatum Roxb. var. planispinum Rehd. et Wils. (Fuyuzanshou) and Fagara ailanthoides Engl. (Karasuzanshou) rootstocks for high viability after grafting and an early canopy establishment. The tree mortality rate was significantly higher on the Inuzanshou rootstock than on Fuyuzanshou or Karasuzanshou rootstock. All trees on the Inuzanshou rootstock died within 3 years after planting. The volume of tree canopy 5 years after planting was significantly larger on the Karasuzanshou rootstock than on the Fuyuzanshou rootstock. The canopy volume on the Karasuzanshou rootstock was twice as large as that of Fuyuzanshou rootstock. Overgrowth of rootstock was observed on the Karasuzanshou rootstock during the 5- year experiment, but there was no imbalance in the growth rate between rootstock and scion diameter. Numbers of flower clusters produced on 5-year old trees were significantly larger on the Fuyuzanshou than on the Karasuzanshou rootstock.