Dynamics of Undergrowth and Its Application to Vegetation Control of Planted Chamaecyparis obtusa Endl. Forests with Special Reference to Mitigation of Surface Soil Loss.

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  • Fukata H.
    Kochi Prefectural Forestry Technology Research Center
  • Watanabe N.
    Kochi Prefectural Forestry Technology Research Center
  • Kajihara N.
    Forestry Bureau, Kochi Prefectural Government
  • Tsukamoto J.
    Education and Research Center for Subtropical Field Science, Faculty of Agriculture, Kochi Univercity

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Other Title
  • 土壌保全からみたヒノキ人工林の下層植生の動態と植生管理への応用
  • ドジョウ ホゼン カラ ミタ ヒノキ ジンコウリン ノ カソウショクセイ ノ ドウタイ ト ショクセイ カンリ エ ノ オウヨウ

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Abstract

Viewed from the erosion control in Hinoki cypress plantations, the dynamics of undergrowth was studied in order to apply the stand density control to vegetation control. Seventeen study plots were set to monitor long-term (10-to-13-year period) changes in coverage under common silvicultural ractices. Eleven plots were made to study the effects of heavy thinning on coverage 2 to 3 years after treatments. The coverage index was determined for each of the following 6 life forms with different light demand and performance in erosion control: commonest ferns (Gleichenia japonica and Dicranopteris linearis), light-demanding herbs and grasses, shade-tolerant herds (chamaephytes), evergreen trees, deciduous trees, and dwarf bamboos. The following 3 temperature zones were distinguished: zone without the commonest ferns and the evergreen trees, zone without the commonest ferns, and zone with both of the life forms. Another distinction was made regarding the type of vegetation according to the total coverage of the six life forms (CT) as follows: poor vegetation type (CT<40) and others (CT≥40). In both the long-term study and the study on heavy thinning effect, the relationships between the change in yield index and the change in coverage index differed among life forms, temperature zones, and vegetation types. Based on the results, it was pointed out that accumulation of data on the relationship between yield index and coverage should be made with distinctions regarding the life form, the temperature zone, and the vegetation type in order to increase applicability of the stand density control to vegetation control.

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