In order to characterize the age structure and spatial variation of the Pinus thunbergii coastal protection forest,42 plots (10m×10m) were investigated in Yantai region. All the trees in the plots were identified,measured and tagged by a sampling method. By substituting for time sere with the spatial sere the structure of Pinus thunbergii measured to detect the age structure. According to different distances to the coastline,the spatial variation of P. thunbergii populations was analyzed. The P. thunbergii ...
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