Larix principis-rupprechtii plantations were selected as study example in Yanshan region. On the basis of mass data about temporary sample plots and analytical trees,screened appropriate data,the concept of dummy variable was introduced according to the different areas character of Longhua County,Weichang County and Saihanba Machine Forest Farm. Nonlinear regression was used to simulate the models of DBH,tree height and volume of L. principis-rupprechtii plantations. The increments of DBH,tree height and vo...
1)河北省林业科学技术研究项目(1308451);“十二五”农村领hongxiang@hebau.edu.cn。Application of Dummy Variable in the Growth Model of Larix principis-rupprechtii Plantations in Yanshan Re-gion/Wang Yong,Wang Xinmei,Mou Hongxiang(Agricultural University of He