JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2012, Vol. 36 ›› Issue (04): 7-12.doi: 10.3969/j.jssn.1000-2006.2012.04.002

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Crown profile simulation of major broad-leaf species of natural secondary forest in north of China

WANG Xiaoming1, LU Jun2*, LI Fengri3   

  1. 1. State Forestry Administration, Beijing 100714, China; 2. Research Institute of Forest Resource Information Technique, CAF, Beijing 100091, China; 3. School of Forestry, Northeast Forestry University, Harbin 150040, China
  • Online:2012-07-07 Published:2012-07-07

Abstract: A simple crown profile model for 10 broad-leaf species in secondary forest collected from Mao’er Mountains in Heilongjiang province was developed using the data of 3 401 living branches from 176 stems. The shape of crown varied along with the depth into crown(CDIN)which expanded at the upper, middle parts of the crown, however, shrank at the lower area, the main model could be categorized into the profile model of upper, middle crown(hRPCA=a0+a1/ln RB+a2/ln(RB)2+a3/ln(RB)3)and the profile model of lower crown hRPCB,birch=b00+[b1·(exp(b2)·ln(RB)-1)]/b3; hRPCB,phellodendri=b0+b101·ln(RB)+b2·ln(RB)2; hRPCB,other=b0+b101·ln(RB)+b22·ln(RB)2+b33·ln(RB)3. The fitting and validation of these crown profile models performed very well and the correlation coefficients were all greater than 0.97.

Key words: secondary forest, crown profile, branch analysis, crown diameter, depth into crown

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