The Effect of Weeding Schedules on Weed Quantity and Operation Time of Improvement Cutting in 13 Year-old Sugi (<i>Cryptomeria japonica</i>) Stand in Kagoshima Prefecture, Southwestern Japan

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  • Fukumoto Keiko
    Forestry and Forest Products Research Institute, Forest Research and Management Organization
  • Kitahara Fumiaki
    Forestry and Forest Products Research Institute, Forest Research and Management Organization
  • Hosoda Kazuo
    Forest Research, Extension and Protection Division, Forestry Agency
  • Ashihara Seiichi
    University Forests, Faculty of Agriculture, Kagoshima University
  • Kajisa Tsuyoshi
    Faculty of Agriculture, Kagoshima University
  • Teraoka Yukio
    Faculty of Agriculture, Kagoshima University

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Other Title
  • 下刈りスケジュールの違いが雑木の量と除伐作業時間に与える影響
  • 下刈りスケジュールの違いが雑木の量と除伐作業時間に与える影響 : 鹿児島県13年生スギ林の事例
  • シタガリ スケジュール ノ チガイ ガ ゾウキ ノ リョウ ト ジョバツサギョウ ジカン ニ アタエル エイキョウ : カゴシマケン 13ネンセイ スギバヤシ ノ ジレイ
  • ―鹿児島県13年生スギ林の事例―

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<p>This study examined the effects of weeding schedules on shrub quantity and operation time for improvement cutting in 13 year old sugi (Cryptomeria japonica) stands. We also assessed the total operation time, which included both weeding and improvement cutting, with different weeding schedules. Then, we confirmed the state of competition between planted sugi trees and shrubs. As a result, shrub density was affected by weeding frequency, and shrub basal area and mean height were affected a year after the previous weeding. The shortest operation time was annual weeding, which was implemented annually from the 1st to 6th year after planting (11.9-12.6 h/ha). Three-time weeding was implemented in the 1st, 2nd, and 3rd years after planting and required about twice as much time as annual weeding (24.5-32.3 h/ha). The total operation time was longest with annual weeding (155.1-181.3 h/ha). Most of the sugi trees in this study site were not in competition with shrubs. We concluded that the operation time of improvement cutting increased with decreasing weeding frequency. However, the total operation time decreased with reducing weeding frequency. Additionally, improvement cutting may be omitted because of competition, and it is more effective for reducing initial silviculture costs.</p>

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