Abstract: Models for estimating primary branch length and branch diameter within live crown were developed in Mongolian Scots Pine plantation in Maoershan experiment farm of northeast forestry university. Data of crown attributes were collected from 2002 to 2003 and from 53 sample trees ranging from in age from 17 to 38 a，diameter at breast height(DBH) from 8.61 to 21.5 cm and total height(HT) from 7.48 to 18.24 m .This crown attributes of primary branches for a specified tree increase with the depth into crown (DINC) increasing. DBH and HT were adequate variables of tree for summarizing the effects of branch length and branch diameter. The test result using Deviance Statistical and Precision tests from the independent test data set showed that these models were suitable for predicting the primary branch length and branch diameter in Mongolian Scots Pine trees and models precision exceeded 95 percentages. Overall, the models were suitable in describing the trends and inherent variability of crown profiles for Mongolian Scots Pine plantation and in three dimensional visualization management.

Key words: Mongolian Scots Pine, crown profile, branch diameter, branch length, branch analysis