Effects of Temperature and Precipitation on Tree ring and Wood Density of Ginkgo in Beijing

Taking 17 year old Ginkgo biloba as test material, the effects of temperature and precipitation on wood ring width, ring density maximum density and minimum density were studied. The results showed that the temperature and precipitation in different months had different influence on the growth of G. biloba. The precipitation in July was positively correlated with ring width with a coefficient of 0.69, the significant level is 0.01. The precipitation in August was positively correlated with ring density, maximum density and minimum density with the coefficients of 0.70, 0.74 and 0.74 respectively in the level of 0.01.