Journal of the Japanese Society of Revegetation Technology

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We examined a revegetation method for a cut slope in forest using natural plant dispersal from the surrounding vegetation. Six plots in a artificial cut slope on bedrock (inclination: 68°E, aspect:S 45° approximately 150 m above sea level) in Tochigi, Japan, were treated with various types of netting and fertilizer to promote the plant invasion. We surveyed the plant communities (coverage, species composition, height of individual trees etc.) and seed rain on the cut slope, and the plant community above the artificial slope. Coverage ratios of fertilized sites were higher than non-fertilized sites and non-established site in every year. Coverage ratios of fertilized sites exceeded 40% after 5 years; in contrast, coverage ratios of other sites were approximately 10%. We concluded that the application of fertilizer was essential for the success of this natural revegetation method. The revegetation method using biodegradable netting with fertilizer and water-retention material was the most effective. The resulting plant community consisted of 29 species/5m², including seven tree species with a density of 21.6 trees/m². The five species with the highest summed dominance ratios (SDR₂) were Miscanthus sinensis (perennial herb), Clethra barbinervis (tree), Lepisorus thunbergianus (fern), Dryopteris erythrosora (fern), and Pinus densiflora (tree). On the other hand, fern species were appeared only fertilized sites. It suggests that fertilizer might be an essential treatment to introduce fern species on artificial cut slope

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The influences on the growth progress and amount of seedlings from drying Quercus serrata seeds at sowing time were investigated. The period from sowing to epicotyl emergence was shortened by drying seeds for one day compared with not drying them, but it was prolonged by further drying. The seeds with longer periods from sowing to epicotyl emergence had shorter periods of epicotyl elongation and leaves expansion, but the entire period from sowing to full expansion of leaves depended largely upon the period from sowing to epicotyl emergence. The period from sowing to epicotyl emergence was not correlated with the desiccation ratios of the seeds. The two parameters, period from sowing to epicotyl emergence and seed desiccation ratio, seemed to act on the growth amount of seedlings separately through physiologically different processes. Judging from the occurrence data of seeds that did not show epicotyl emergence, it would become a tentative criterion to retain seed drying less than five days and seed desiccation ratio less than 10%, in order to reduce the minus effect of seed drying at sowing time

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