Existence status of Daiba-kunugi forests (pollard forests of Quercus acutissima) in Nose town, Osaka prefecture

Abstract

In this study, we investigated the distribution, growth, and management of the pollard forests of Quercus acutissima (Daiba-kunugi) in Nose town, Osaka prefecture, one of the main distribution areas of Daiba-kunugi forests. 41 sites were surveyed in the field, and the results showed that most Daiba-kunugi forests were located on slopes. In addition, the damage caused by deer browsing was significant, and currently nearly half of the forests were left unattended. A growth condition survey was conducted in the Daiba-kunugi forests at seven sites, which revealed that many individuals in the managed forests had more than one pedestal, and that logging was managed with the pedestal positioned higher up. In the managed forests, felling tended to occur at heights greater than 170cm, which was higher than in the neglected forests. It was suggested that these were the result of setting the pedestals higher to avoid feeding damage by deer. The forest, consisting of a large perimeter length of Daiba-kunugi, is considered to have more historical and cultural value. Support for tree management and promotion of the cultural value of the Daiba-kunugi through designation as a natural monument are future issues.