Transfer Effects and Variations in Basic Density and Tracheid Length of 'Pinus sylvestris' L. Populations

摘要

Basic density and tracheid length were assessed in 67 provenances from one or more of 18 provenance trials at the age of 30 years. From each provenance and trial 10 trees were sampled from a 1.25 meter spacing and 10 trees from a 2.0 meter spacing whenever possible. Assessments were made at growth rings five and ten respectively from the bark for basic density and at growth ring five from the bark for tracheid length. Provenance variation was significant for basic density and tracheid length in 50 percent of the trials. A narrow spacing increased basic density but tracheid length was not changed. The study indicates that changes in forest management and forest tree breeding are needed in order to increase basic density and fiber length.