Yang na Trees (Dipterocarpus alatus Roxb. ex G. Don), Dipterocarpaceae Along Chiang Mai-Lamphun Road An Analysis of Their Present Status and Conservation Needs

Abstract

This study analyses the status and defects of 1,107 yang na trees along Chiangmai-Lamphun road. Local people's opinions on the matter are analysed, using questionnaires. A total of 118 replies were obtained. It was found that there were few differences in response among sexes, age groups, education levels and occupations, most people regarding yang na trees favourably. It was also found that most trees were still in good condition, only a few needing to be removed, and that most defects were caused by man. Protection, management and maintenance are needed from all social strata.