Abstract: [Objective]Global warming was mainly caused by the increasing amount of greenhouse gases (especially Carbon dioxide, CO₂), which were made by human activities. Wood is the main body of trees. The carbon content of wood is 50%. Thus, wood is a huge carbon repository. [Method]Pinus koraiensis plantations from the northeast of China were selected as raw materials. The carbon storage function of Pinus koraiensis was studied. First, the physical characteristics and carbon storage of wood were measured and calculated. Then, the radial variation regularity of the wood carbon storage and the growth ring density, growth ring width, latewood ratio, and growth rate, was analyzed systematically using regression analysis and correlation analysis methods, Finally, we obtained the radial variation regularity figure, fitting figure, regression equation, and so on.[Result]The results showed that: the carbon storage of wood firstly decreased slightly on the radial variation. Then, the carbon storage of wood increased with the growing of trees. Next, it decreased to a steady state after the trees became mature. The carbon storage of wood and the radial variation trend of the physical characteristics had a peak at around 18 years. The radial variation trend between the wood carbon storage and the growth ring density was relatively similar. The fitting degree was high. The correlation was apparent with correlation coefficient of 0.757. The early radial change between the carbon storage of wood and the width of growth ring was similar. But the middle and late radial variation was inconsistent. The fitting degree was low. The correlation was weak with correlation coefficient of -0.301. The middle and late radial change between the carbon storage of wood and the latewood rate was similar. The fitting degree was high. The correlation was apparent with correlation coefficient of 0.656. The early and middle radial variation trend between the carbon storage of wood and the growth rate was different. The fitting degree was low. The correlation was not apparent with correlation coefficient of -0.68. [Conclusion]The carbon storage of Pinus koraiensis had a certain relationship with the physical characteristics. The climate factors, growth environment and genetic factors were the important factors which can not be ignored. They remained to be further researched. To improve the ecological environment and alleviate the greenhouse effect, we should operation and utilization of trees reasonably to strengthen the carbon storage function of man-planted forest and restrain the carbon dioxide emissions into the atmosphere directly.

Key words: Pinus koraiensis plantations, carbon storage, physical characteristics, radial variation