Influence of flood disturbance on the regeneration of Cyclobalanopsis glauca populations.
Three plots of Cyclobalanopsis glauca [Quercus glauca] populations suffering to different extents from flood disturbance in valleys of Huangshan Mountain, Anhui Province, were selected to study seedling characteristics. The plot (plot 3) least disturbed by flooding had more seedlings than the others (population density 0.5825 m-2). The seedling density in the plot (plot 1) most heavily flooded was only 0.1150 m-2, although the proportion of 'seedlings' originating from sprouts was the highest in this plot. In all the 3 plots, the percentage of sprout origin plants increased with seedling height. The distribution of height of sprout origin plants was nearly symmetrical and platykurtic, but for seed origin seedlings it was positively skewed. All the Gini coefficients were high (0.5031-0.5623), indicating that the size inequality was large. The sprout origin plants in all plots had a clumped distribution, while the seed origin plants in plots 2 and 3 had a random distribution. However, a clumped distribution was found in plot 1 for seed origin plants distributed at higher edge of the plot due to the flood disturbance. It is concluded that C. glauca populations at sites disturbed by flood regenerated mainly by vegetative propagation rather than sexual propagation.