Abstract:

The dynamic of radial growth of Cupressus funebris in Yunyang County, Three-Gorges reservoir area was assessed by dendroecological techniques. The residual chronology (RES) and standard chronology (STD) of C. funebris were developed through crossdating after filtering out the genetic factors which influence tree-ring growth using a mathematic model, and the relationship between radial growth of C. funebris and climate factors were analyzed. The result showed that there was a significantly negative relationship between the tree-ring growth and the mean temperature of current spring season. The radial growth was significantly and negatively affected by the mean monthly temperature in January and February. Additionally, there was no significant relationship between tree-ring growth and monthly precipitation, monthly humidity index. The correlation analysis between the occurrence of Chinolyda flagellicornis and STD also demonstrated that the total occurring area of C. flagellicornis and the infection rate of C. funebris were significantly correlated with the tree-ring growth. Finally, the correlation model of tree-ring width index and climatic factors was established by multi-factor regression for predicting growth of C. funebris.

Key words: Yunyang County, Cupressus funebris, growth, tree-ring, pest