Abstract: Based on four stages of Ariel image since 1959,and supported by ARC/INFO,the similarity index to circle (SIQ) and fractal dimension (D_f) of all types of landscape patches in Guandishan forest region were analyzed in this paper.The results showed that SIQ was efficient to analyze and explore the characters and dynamics of patch shape.During the process of forest landscape restoration in the study area,SIQ of non forest patch was always higher than the forest patch.The SIQ of forest patch increases persistently in the period.The patch shape became more complex.The landscape was in the middle stage of active forest restoration and patch succession,dominated by the extension and combination process of later succession forest patch,which had more complex and diversified patch shape and more close correlation with other patches.The early succession forest patches with comparatively simple shape gradually declined.

Key words: Songnen plains, Degenerated grassland, Leymus chinensis population, Reproductive module, Reproductive allocation