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Distributions of growth strains in branches, straight trunks and basal sweeping trunks of  Chamaecyparis formosensis  Matsum. trees were measured with strain gauges. Microfibril angles (MFAs) of the S 2  layer of the cell wall were measured by the iodine deposition method and their relationships with growth strain examined. The magnitude of the compressive stress on the lower side of trunks with a basal sweep was greater than that of the tensile stress at the surface of straight trunks. However, transverse compressive stress was similar around the trunk regardless of whether normal wood or compression wood was present. The released surface growth strains varied with MFA. At MFAs of 20–25°, growth stress changed from tension to compression, and compressive stress increased dramatically in the compression wood region.

Growth strain in the trunk and branches of Chamaecyparis formosensis and its influence on tree form