[Responses of radial growth of var. and to climate change].

In the context of global warming, the increases of temperature may affect tree growth and thus disturb ecosystem balance. In this study, we explored the main limiting factors for radial growth of var. and in the Mohe area of Greater Khingan Mountains by using growth-climate response function analysis and moving correlation analysis, as well as the interspecific difference of the responses of radial growth to rapid warming. The results showed that the radial growth of var. and was affected by both temperature and precipitation. var. was more sensitive to climate change than , and its sensitivity to climate factors was more stable than The radial growth of var. was significantly positively correlated with the monthly mean temperature and the monthly mean minimum temperature of the growing season, while that of was significantly positively correlated with the monthly mean temperature and the monthly mean maximum temperature of winter. Precipitation in winter promoted the growth of var. , whereas precipitation in the late growing season of the previous year inhibited the radial growth of . After the rapid warming in 1990, the limiting effect of precipitation on var. changed from negative to significantly positive, with the inhibition effect of high temperature being greater than the promotion effect. The inhibitory effect of high temperature on was enhanced, and the limiting effect of precipitation on was also enhanced after heating up. The growth rate decreased significantly, with obvious difference being observed in the correlations between the growth rate of two species with temperature and precipitation. Our results could provide scientific basis for forest ecosystem management and protection in Greater Khingan Mountains.