Population structure and regeneration status of tree species in old growth Abies pindrowdominant forest: A case study from western Himalaya, India

•The species accumulation curve (SAC) predicts higher species richness than the observed species richness in the study area (Abies pindrowdominant Humkhani forest, Sainj valley, western Himalaya).•Tree species low density and high basal area (BA) in studied forest is an indicative of old and climax forest that has maintained good regeneration status and reproductive success over the ages.•Aesculus indica, Abies pindrowand Juglans regiashowed more relative density in higher DBH classes than the lower DBH classes is a matter of concern for the Himalayan forests.•The current trend of regeneration is an indicative of changes in the structure and composition of tree species in future.