C-14 CONCENTRATIONS IN TREE STEMS .2.

C-14 concentrations of Teak (Tectona grandis) and Tipa (Tipuana tipa) were measured and analyzed statistically. Consequently, there is no in dividuality between C-14 concentration variations of the two Teaks whi ch had grown in the same stand. Latitudinal dependence in the tropical area was found in the tree stems. More detailed variations were obtai ned than ever. The age determination of tropical trees that have no an nual rings become more accurate than ever before. Longitude dependence of C-14 concentrations was not detected in the tropical area. Adding to the latitude dependence, these are basic and useful data for analyz ing global CO2 circulation.