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Two series of larch progeny tests were established at three locations in Pennsylvania in the spring of 1984. The Penn Orchard series contained progenies of 24 "plus-tree" Japanese larch clones growing in a seed orchard in Pennsylvania, two production seedlots of Japanese larch, and two lots of Japanese x European larch hybrids. The Westvaco test contained 5 hybrid seedlots and 15 seedlots of Japanese larch originating from 9 seed orchards (including Penn "A" Orchard), 5 plantations, and one natural stand. After 7 yr, only one site was clearly ideal for Japanese larch, having produced both rapid growth (0.83 and 0.99 m/yr) and high survival. Survival or growth was considerably lower at the other two sites, probably because of both seasonally excessive and deficient soil moisture. Hybrid lots were significantly shorter than others at the best site; they tended to survive significantly better than Japanese larch at the other two sites, but they did not necessarily grow taller. Progenies from seed orchards were not significantly faster growing than those from plantations or natural stands (Westvaco test); and progenies from select trees in the Penn Orchard test were not significantly faster growing than production lots. Although genetic effects on 7 yr height were significant in most individual plantations, few seedlots could be statistically distinguished as superior or inferior in growth rate. Seedlot pedigree had much less influence on growth rate or survival than did choice of site. North. J. Appl. For. 11(2):53-57.
Document Type: Journal Article
Forest Resources Laboratory, School of Forest Resources, The Pennsylvania State University, University Park, PA 16802
Publication date: June 1, 1994
More about this publication?
Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Northern Journal of Applied Forestry covers northeastern, midwestern, and boreal forests in the United States and Canada.