The responses of tree ring width of Pinus massoniana at different latitudes (26°33′N: northetn part, 25°47’N: center part, 24°42′N: southern part) to climate changes in Nanling Mountains of south China were investigated by choosing P. massoniana sample trees and sampling sites. Samples were collected at the 1.3 meter height of sample trees and then dried, polished and measured ring wheel width by using LinTab5 type ring wheel measuring analysis system, according to the normal process of tree-ring analysis, the chronology was attained usin...