The values of the quantitative characters in the
H area were higher than those in the VH area but
lower than that in the M area because the M area has
been abandoned and left to natural succession for 15
years. Seedlings of fast growing species can invade
the M area under the low competition and no
limitation on light and nutrient resources. In this
secondary deciduous area, however, forest fires play
the importance role of controlling the succession rate
because the fire damages some seedlings and saplings.
If the forest fire controls them, the density and basal
area will rapidly increase.