A comparative study on species composition and population dynamics characteristics of two Abies plants in the Pinaceae

Abstract Abies in the Pinaceae family is a core establishment species of coniferous forests in the Northern Hemisphere. This study presents comparativethe species of the species composition and population dynamics between two Abies plants in an urban greenspace ecosystem Changchun, China. A comparative analysis of species composition, importance values, height structure, age structure and population dynamics characterized by the sample survey method and TWINSPAN classification and DCA ranking. Research findings show: (1) A. holophylla and A. nephrolepis communities are dominated by sphagnum pine and white birch, respectively; (2) The age structure of A. nephrolepis population is fusiform, dominated by adult individuals, while A. nephrolepis population is dominated by juvenile individuals, showing an inverted “J”-shaped structure; (3) A positive value of the dynamic index of population change in the age structure (Vpi) and the dynamic index of population change in the age structure (V'pi) of A. holophylla and A. nephrolepis populations when external disturbance is taken into account suggests that these two populations are currently in a state of growth; and (4) The survival curves of both Abies populations tended to be of the Deevey-II type, with higher mortality rates in the early growth stages, but decreasing with age-class.