PurposeIn order to evaluate the site quality and potential productivity of forest land in Anxi County, Fujian Province, and provide a basis for suitable land and trees.
MethodThe investigation of site factors and growth conditions was conducted in Fujian Cypress plantations in Anxi County. According to the score values of site factors, the main factors affecting the growth of the stands were analyzed for dividing the site types by Quantitative Theory I. Then, we determined the site quality grade and established prediction equation of the quantitative theory, which was used to evaluate the site quality quantitatively of Fujian Cypress plantations in Anxi County.
ResultThere was a very significant correlation between site index and six site factors, including slope direction, slope position, slope degree, altitude, soil thickness and humus thickness. The contribution rate of slope, soil thickness and slope direction to site index reached up to 71.42%, all of which significantly affected. The plots were divided into 48 site types by three leading factors, and then based on the quantitative score table, the 48 site types were divided into four grades: excellent, good, medium and poor. The result of examination of the prediction model indicated that it met the precision requirements.
ConclusionThe site is in good condition and suitable for the growth of Fujian Cypress plantations. The quantitative theory method can be applied to evaluate the site quality of forest land and predict the growth trend of the stands.