Abstract: Treering width measurement is not only an important basis for studying tree growth process and forest production, but also a crucial skill in forest measurement. The objective of this study was to propose three methods which take advantage of image processing software for measuring ring widths of stem disk. Based on highresolution image scanned or took by camera, coordinate information was extracted with the help of geographic information system (GIS). The ring widths were then computed as the distance between two points. This approach could not only improve the measuring accuracy, but also make the measurement more costeffective. In addition, it is especially practical when specialized instruments are not available.

Key words: litterfall removal, root removal, ecological stoichiometry, soil physical property, soil organic carbon