Abstract: By using spatially explicit landscape model (LANDIS), the 400 years’ forest landscape changes in Youhao Forestry Bureau in Xiao Xing’an Mountains under forest cutting and non-cutting scenarios were simulated, and the distribution area, age class, and aggregation index of six dominant species were calculated with APACK. The results showed that opposite to noncutting, the fire regime under forest cutting was characterized by high frequency, low fire severity, and small fire damaged area. Cutting had less effect on the distribution of the species, but changed their age structure significantly, being mostly manifested in the decrease of over-matured cohorts and the increase of young, middleaged, quasi-matured, and matured cohorts. Cutting also reduced the aggregation degree of species distribution, resulting in the fragmentation of forest landscape to some extent.

Key words: Tree, Genetic engineering, Ecological risks