[Individual and modular biomass dynamics of Kingdonia uninflora population in Qinling Mountain]

The individual and modular biomass dynamics of Kingdonia uninflora populations in Qinling Mountain were studied systematically. They could be expressed by Logistic equation. The ratio of leaf to bud biomass of population decreased with its increasing age, whereas the ratio of the root system to the subterranean stem biomass increased. The individual and each modular biomass of different populations at different altitudes were significant different (P < 0.05), which were larger at altitude 2700-2900 m than at the lower and higher altitudes. The rate of leaf biomass decreased as altitude rose, whereas that of the subterranean stem increased. In the favorable area, the rate of root system biomass was less, whereas the bud biomass was bigger compared with other habitats. The individual growth and modular biomass accumulation were closely related to habitat condition.