Geographic variation in juvenile growth characteristics of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) from the coastal ranges of California Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9880vt31z

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  • A sample of 181 wind pollinated families, representative of the range of environmental conditions occupied by Douglas-fir in northern California, was used as a basis for studying variation in early height growth, phonology, and seed characteristics. Seedlings were raised at Corvallis, Oregon, in a nursery trial designed to evaluate response to varying levels of moisture stress, Variation in cold hardiness was also assessed growing a period of approximately low winter temperatures. It was demonstrated that seedlings from the coastal fog-belt regioret buds later; grew taller; were less cold hardy; and had less capacity to go dormant in response to moisture stress than did samples from the inner ranges. Coastal samples were also characterized by smaller seeds; slower germination; and seedlings with fewer cotyledons and shorter hypocotyls. Lesser variation patterns associated with source elevation and latitude were apparent. For characteristics related to the annual cycle of growth and dormancy, regional differences were greater in relation to family variation than they were for seed related factors. The adaptive significance of this is considered. Regress ion analyses are presented relating seed weight, and epicotyl length at the end of the first growing season, to source climate and location; the models are then used to compare results of the present study with previously published data. Finally, implications of the study for Douglas-fir seed movement within Caiifornia, and to exotic planting sites, are discussed, and a procedure for seed lot origin verification suggested.
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