By using totally locating method and single tree competition index model, this paper studied the competition intensity of Mongolian pine forests in Hulun Buir sand region of Inner Mongolia, with the fire-disturbed Mongolian pine forest as a case.

In this paper,the Korf theory growth equation was applied,just as correctional methods of growth volume,the growth volume model of single wood diameter,adopted relative diameter based on dominant wood as competitive index of single wood,was established and tested,it was proved to be precise highly and adapted widely to simulating the growing t.

Through analysis and simulation using permenent sample plot data, a competitive index reflecting objectively the competition and growth pattern of Pinus taiwanensis plantation was selected; based on the selected competitive index, stand growing models containing competitive index, age, diameter at breast height (DBH) and mean growing index have been established, which can.

Study on trees competition indexes to Larix olgensis commercial forests;

The relationships among 5 competition index and DBH, tree height and crown length have been established.

A selected competition index was used to describe the law of competition in naturally regenerated Sassafras tzumu forest.