Abstract
Introduction of nut species into moist artificial cut slope with sowing revegetation methods were examined in Tochigi Prefecture. Four nut species were used with exotic herbaceous species, native herbaceous species and native pioneer tree species to achieve the revegetation objective which was to produce nut species dominant community after producing grass covered community. The revegetation methods we examined were revegetation mat method, growth material spraying method and the method which set up nuts with cylinders on slope and spray growth material over it. The plant communities were continuously investigated for 8 years. As a result, exotic revegetation species have grown in all experimental plots in first year. Then, the other species coverage was increase in the passing age, their coverage ratios were decline and there were the plots in which they had disappeared in year 8. Excluding revegetation mat plot, nut species were dominate in year 8 after improvement cutting of pioneer tree species in year 5. We judged that the revegetation objective had been achieved in year 8. Because the improvement cutting of revegetation mat plot was insufficient, pioneering tree species dominated in year 8 and some nut species withered. Therefore, when nut species and pioneer tree species are used together in sowing revegetation method, it is necessary to cut the pioneer trees which grow up excessively. Moreover, we suggest that it is effective to reduce an amount of other seeds which are mixed with nut species when selected revegetation method has high ability to resist erosion.
