| 摘要 |
PROBLEM TO BE SOLVED: To provide a greening system for the surface side of a base material, for example, a flat roof of a house or other structure that can attain good drainage as well as good water retention, as the increase in the fixing load caused by use of conventional ground watering systems or by construction of these systems with concrete is avoided. SOLUTION: Drainage mats 3 are placed through a waterproof layer 2 on the base material 1 and planting mats 7 made of felt are spread all over the drainage mats 3 through drainage mats 4. Drainage holes 5 are bored on the planting mats 7 in a prescribed size at a prescribed pitch and filled with a drainage material 6, sand and/or pebbles at the upper part, further with a supporting material 10 and seedbed soil 11. The plant seeds, stalks and leaves in the seedbed soil 11 are germinated and grown and the greening 14 is attained. In the meantime, rain water passes through the bed soil 11 or through the drainage holes 5 of the planting mats 7 out of a lower drainage layer and water is retained by activated carbon 8 mixed in the planting mats 7 or by a water retention agent 9 whereby the greening grows favorably. The greening is advantageous for global warming prevention and environment deterioration inhibition and can surely attain excellent designing appearance in low costs.
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