文章基本信息

标题：ヒノキ実生コンテナ苗の4年間の成長と下刈り年数短縮の可能性
本地全文：下载
作者：渡邉仁志 ; 茂木靖和 ; 三村晴彦等
期刊名称：日本森林学会誌
印刷版ISSN：1349-8509
电子版ISSN：1882-398X
出版年度：2021
卷号：103
期号：3
页码：232-236
DOI：10.4005/jjfs.103.232
语种：Japanese
出版社：The Japanese Forest Society
摘要：コンテナ苗が下刈り年数の短縮に寄与するかどうかを検討するため，実生ヒノキのコンテナ苗と裸苗について植栽後4年間のサイズ，成長量，および雑草木との競争関係を比較した.コンテナ苗が樹高および根元直径の相対成長率で裸苗を上回ったのは，植栽1年目に限られていたが，成長量はその後も持続して裸苗と同等以上であった.連続した4年間の下刈りの結果，植栽5年目の夏期には，調査区の雑草木は平均植生高が150 cm程度のススキや落葉低木になっていた.このとき，コンテナ苗の樹高は284 cmで，裸苗より約40 cm高かった.この結果には，通常よりも肥効期間の長い緩効性肥料をコンテナ苗の元肥として用いたことが影響したと考えられる.本研究のコンテナ苗は裸苗よりも1年間早く雑草木との垂直方向の競合状態が緩和されたことにより，下刈り年数が短縮できた可能性がある.
其他摘要：We compared the growth of containerized and bare-root Japanese cypress (Chamaecyparis obtusa) seedlings for four years after planting, and also investigated the competition between seedlings and their surrounding weeds to assess the possibility of reducing the number of weedings. The height and diameter growth of the containerized seedlings was equal to or higher than those of the bare-root seedlings, though the superiority of the formers' relative growth rate was not evident after the first year. With regular weeding, once a year over the four years, the weeds observable in the summer of the fifth year were Miscanthus sinensis and deciduous shrubs (roughly 150 cm in height). The average height of the containerized seedlings at this time was 284 cm, roughly 40 cm higher than that of the bare-root seedlings. We considered that this was owing to the fact that the containerized seedlings had been reared with slow-release fertilizer, eluted over longer periods than usual, as base fertilizer. Furthermore, the vertical competition between the seedlings and weeds abated one year earlier than in the case of the bare-root seedlings, and weeding could be omitted, in the summer of the fifth year, in the containerized seedling plot. Consequently, it was suggested that the number of weedings could be reduced by one year in the case of the containerized seedlings.
关键词：競合状態;雑草木;下刈り;樹高成長;元肥
其他关键词：base fertilizer##competition status##initial height growth##weed##weeding