Population Structure and Spatial Distribution Pattern of Natural Regeneration Larix principis-rupprechtii in Guandi Mountain

Lurix priucipis-rupprechtii is one of main constructive tree species of conifer forest which is dis-tributed in semi-humid region,north China. The population structure and spatial pattern of different size classes were studied in a natural regeneration stand which lies in a clear-cut strip. The results revealed that Larix principis-rupprechtii population trends decline for the shortage of seedling and sapling. But the population has the potential to be stable in respect that long life span,abundant trees of middle size class and disturbance. The seedlings and saplings were clumped. Trees of 2. 5 cm≤>Larix principis-rupprechtii was related to itself biological characteristics and light.