Abstract:

Tree ring width is sensitive to the changes of climate in the cold or arid regions and less sensitive in the humid and warm climatic regions.However,some studies show that the tree ring δ13C of some species of trees in the humid and warm subtropical region of China is sensitive to the climate changes.Whether the Pinus massoniana Lamb ,as the widest distributed tree in the region,its δ13C is also sensitive to climate changes and to which climatic indicators,is still not clear.Two trees of Pinus massoniana Lamb on Mt.Zijin at Nanjing are selected and analyzed,in order to detect the sensitivity of its δ13C to climatic change.The relationship of the tree δ13C with the local temperature,precipitation,air humidity,and sunshine time,is analyzed.The results suggest that,the δ13C has closer correlation with the climatic indicators of the same year than that of the year before.The tree from the southwestern slop of the mountain has a higher value of δ13C,and the δ13C is better correlated with monthly mean lower or high temperature than from the southeastern slop.The pine tree δ13C is positively correlated with the monthly mean temperature,monthly mean high temperature and sunshine time,and negatively correlated with monthly mean lower temperature,precipitation,and air humidity