A Study on the Actual Conditions of Wild Grass Preservation on Bank Slopes in Mountainous Paddy Fields

Abstract

Recently, the number of species of wild grasses near ourselves in Tower areas has been decreasing rapidly. Today, it has been said that agricultural basic planning is necessary for paddy fields in the mountainous areas, therefore, aboundant wild grasses which still remain in mauntain villages have become seriously depleted.
Mountainous paddy fields have wide bank slopes, where aboundant wild grasses are preserved. This time, we investigated the vegetation of wild grasses on bank slopes three times in May, July, September to clarify actual conditions on 50 bank slopes in Minamihiji, Hase Village, Nagano Prefecture. As a result, we are able to classify bank slopes into mainly 12 kinds by dominant species, and we found that density of vegetation changes by the season. Furthermore, we are able to arrange them into six types of characteristic differential species by means of constructive species. We think that with these vegetative conditions, we will be able to find out a useful method for wild grass growing, preservation and management in the future.