立地质量评价研究进展

目的评价福建省安溪县福建柏的立地质量和生产潜力，为适地适树提供依据。方法通过对安溪县福建柏立地因子和生长状况的调查，应用数量化理论Ⅰ，依据各因子的得分值排序，筛选出主导因子来划分立地类型，进而构建数量化预测方程并确定立地质量等级，对福建柏的立地质量进行数量化评价。结果坡向、坡位、坡度、海拔、土层厚度和腐殖质层厚度6个立地因子与立地指数相关性达极显著水平；其中，坡度、土层厚度和坡向对立地指数的贡献率达71.42%，且均影响显著；采用3个主导因子将样地划分为48个立地类型，并根据数量化得分表划分出优、良、中、差4个等级；预测方程经检验达到要求。结论安溪县立地条件良好，适合福建柏生长，数量化理论方法可应用于评价立地质量和预测福建柏人工林生长趋势。

Forest site classification and evaluation: a South African perspective

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.