Growth effect of Dahurian larch-Manchurian ash mixed forests

Abstract

With the method of stem analyses by the microscope, the xylem’s accumulations at different ages were quantitatively studied using the data of typical plant association for Dahurian larch (Larix gmelini Rupr) and Manchurian ash (Fraxinus mandshurica Rupr) mixed forests. The developing process for this important mixed forest type in the study area was systematically established. The result showed that in the artificial stand of Dahurian larch mixed with natural Manchurian ash, only those which have the same origin as Dahurian larch can grow up before the closing of stand and form the components of the main layers. After 24 years self-thinning, when they were 29 years old, Dahurian larch would be at the stage of no self-thinning. At last the stand would develop to the broad-leaved forests dominating with the Manchurian ash.