Phenology and population structure of six tree species in tropical forest of Assam, northeast India

摘要

The present paper deals with phenology, population structure and regeneration status of six important tropical tree species namely, Bauhinia variegata, Careya arborea, Dillenia pentagyna, Sterculia colorata, Sterculia villosa and Terminalia belerica. The study was carried out in two forests of Assam, India, namely Lumding Reserve Forest and Doboka Reserve Forest. Phenophases like- leaf fall, leaf initiation, flowering and fruiting were recorded monthly for one year. Phenophases depend on environmental/meteorological conditions of the study area and were species specific. Cool and dry winter period is largely associated with leaf fall of all the selected species, however, Bauhinia variegata and Terminalia belerica showed fruiting during this period. Bauhinia variegata, Careya arborea, Terminalia belerica and Sterculia villosa showed expanding population. All the six species indicated either 'good regeneration' or 'fair regeneration'.