Responses of the Tree-Ring of Abies faxoniana and Tsuga chinensis to Climate Factors in Sub-Alpine in Western Sichuan

By using the tree-ring samples of Abies faxoniana and Tsuga chinensis collected from sub-alpine forests in Wolong Sichuan in 2010, the tree-ring width standard chronologies and residual chronology were established. A. faxoniana and T. chinensis tree-ring chronology in this region contains worthy climate information. The calculation results showed that A. faxoniana and T. chinensis tree-growth and tree-ring width chronologies were significantly positively correlated with the mean air temperature, suggesting that it was the restriction factor for the tree growth. In study area, the tree-ring width of A. faxoniana was positively correlated to the mean monthly temperature in current February and April (P≤0.05). The correlations of the tree-ring width of A. faxoniana with monthly precipitation and relative humidity were being negative with the lots of months. The tree-ring width of T. chinensis was positively correlated to the mean monthly temperature last July and current February to April (P≤0.05) and to the monthly precipitation in last October and current May (P≤0.05), and was significantly negatively correlated with monthly relative humidity in last July and current April and September (P≤0.05).A. faxoniana tree-ring width chronologies was not significantly correlated with season average climate factors; but T. chinensis tree-ring width was significantly positively correlated with Spring temperature, and was significantly negatively correlated with Spring relative humidity (P≤0.05).