Abstract:

Based on the mensuration data of diameter at breast height (DBH) from about 120 thousand survival trees in Inner Mongolian forest inventory 2013 of the 8th National Forest Inventory in China,individual tree DBH growth rate models for major tree species were developed for two modeling populations,Inner Mongolian Autonomous Region (I) and Inner Mongolian Key State-owned Forest Management Bureau of Daxing’anling (II).For some tree species with a wide range of distribution in modeling population I,dummy modeling approach was used to develop DBH growth rate models suitable for eastern,central and western regions.The results showed that determination coefficients (R ²) for most tree species were more than 0.96,and mean prediction errors (MPE) were less than 1%,when DBH growth rate models were used to estimate diameters at the end of interval period.The developed DBH growth rate models would provide quantitative basis for determining whether the DBH growth of trees is too large in field survey of Inner Mongolian forest inventory of the 9th National Forest Inventory.

Key words: growth rate model, continuous forest inventory, survival tree, dummy variable, Inner Mongolia