Species identification and feasibility of identification
First step is to identify species and feasibility. This method refers to species with obvious tree-ring formation of multi-year-grown ligneous plant in temperate zone.
The samples of cross section
For tested samples, we need the cross section from each sample tree at the positions of DBH(1.3 m above ground ) and stump(0.3 m above ground ).
The samples of increment core
An increment corer was used to cut cores 5 mm in diameter from samples trees. From each sample tree, we extracted a pith-to-bark increment core specimen at the positions of DBH(1.3 m above ground ) and stump(0.3 m above ground ).
Tree ring width measurement and cross dating
After the samples were prepared, based on cross dating of dendrochronology methods for annual tree-ring, tree ring width data were measured using a microscope and the LINTAB system. The tree-ring data were cross dated by visual and the COFECHA software to ensure the quality of tree-ring dating.

Taiwan Forestry Research InstituteTaiwan Forestry Research Institute

Tree Age Determination