Table 1. General characteristics of sample plots by regeneration types in Robinia pseudoacacia forests

Regeneration types	No. of plots	Stand age	Mean DBH (cm)	Mean height (m)	No. of trees (trees/ha)
Artificial*	240	30 12 − 48	18.6 7.7 − 36.4	12.6 4.6 − 21.0	1 , 003 225 − 2 , 325
Natural**	323	31 15 − 52	18.9 7.9 − 30.3	12.6 6.2 − 19.2	961 150 − 2 , 400

Artificial regeneration forests,
Natural regeneration forests