Growth material erosion tolerance for three months after construction of growth material spraying revegetation method

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  • 植生基材吹付工施工後３ケ月間の植生基材の耐侵食性
  • 植生基材吹付工施工後3ヶ月間の植生基材の耐侵食性
  • ショクセイ キザイ フキツケコウ セコウゴ 3カゲツカン ノ ショクセイ キザイ ノ タイシンショクセイ

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Abstract

When slow germination and growth plants were used in growth material spraying revegetation method, long term erosion tolerance of growth material is important factor. The purpose of this study was confirming the tolerance of sprayed growth material for revegetation. We measured erosion of sprayed growth material for three months after revegatated. Three types of experiment plots were set with wood boxes One was sprayed only growth material, and one was sprayed growth material which was mixed forest topsoil in 20%, and one was revegetated normal growth material spraying revegetation method used common revegetation seeds. We set the boxes in 63° and 45°. The plots used topsoil and revegetation seeds were covered by plants. Erosion thickness of growth material for three months was 0.55-1.16 cm in 63° plots and 0.15-0.70 in 45° plots. Erosion values were comparatively small and normal growth material spraying revegetation plots were the most eroded. In addition, we measured erosion tolerance for heavy rain (100 mm/h) used artificial rain machine. The maximum erosion thickness was 0.04cm and maximum weight of eroded growth material was 3.6g/m2. These results confirmed that bare growth material and growth material even mixed topsoil in 20% had satisfactory tolerance for erosion in three months after revegetated.

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