Geographic Variation in Specific Gravity Among Japanese Larch From Different Provenances


  • Judy Loo
  • D. P. Fowler
  • M. H. Schneider


Japanese larch, Larix leptolepis, provenance, specific gravity, genetic variation


Genetic variation in wood specific gravity is reported for Japanese larch from twenty seed sources at age 17 years from planting in central New Brunswick, Canada. Information on native tamarack and European larch is also presented. Differences in mean specific gravity among provenances of Japanese larch (range 0.385 to 0.417) are highly significant. Specific gravity is not correlated with 12-year height, specific gravity of trees of the same provenances growing in Michigan, or with latitude, or elevation of the provenances. There is a weak but significant negative correlation between specific gravity and tree diameter at 1.3 m. Provenance x environment interaction in respect to specific gravity is high, making it difficult to identify provenances that will be superior over a wide area.


Cook, D. B. 1971. Genetic improvement as applied to larch. Proc. 18th Northeast. For. Tree Improv. Conf. 69-72.nFarnsworth, D. H., G. E. Gatherum, J. J. Jokela, H. B. Kriebel, D. T. Lester, C. Merritt, S. S. Pauley, R. A. Read, R. L. Sajdak, and J. W. Wright. 1972. Geographic variation in Japanese larch in north central United States plantations. Silvae Genet.21:139-147.nGates, C. E., and J. D. Bilbro. 1978. Illustration of a cluster analysis method for mean separation. Agron. J.70:462-465.nGenys, J. B. 1971. Diversity in Japanese larch from different provenances studied in Maryland. Proc. 19th Northeast. For. Tree Improv. Conf. 2-11.nHattemer, H. H. 1969. Versuche zur geographisihen variation bei der japanischen Lärche. Silvae Genet.18:1-21.nIsebrands, S. G., and C. M. Hunt. 1975. Growth and wood properties of rapid-grown Japanese larch. Wood Fiber7(2):119-128.nLee, C. H. 1975. Geographic variation of growth and wood properties in Japanese larch in southwestern lower Michigan. Proc. 12th Lake St. For. Tree Improv. Conf. 35-46.nSmith, D. M. 1955. A comparison of two methods for determining the specific gravity of small samples of second-growth Douglas fir. USDA For. Serv. Rep. 2033. 21 p.nSmith, D. M., and H. E. Wahlgren. 1971. Half a core gives better results in core-to-tree relationships. Tappi54:60-62.nStairs, G. R. 1965. Geographic variation in Japanese larch. Proc. 13th Northeast. For. Tree Improv. Conf. 30-36.nZobel, B. J. 1964. Breeding for wood properties in forest trees. Unasylva18:89-103.n






Research Contributions