Interaction of seed source, competition and fertility on planted Douglas-fir (Pseudotstuga menziesii [Mirb.] Franco) Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/5m60qw83s

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  • The main objective of this study was to evaluate the interaction between herbaceous competition, fertility, and seed source on Douglas-fir survival and growth. A secondary objective was to evaluate the effect of these various factors on the production of lammas shoots and the selectivity of deer browse. Finally, the role of lammas growth in the recovery from deer browsing was examined. Lammas growth, commonly referred to as second flushing, is the precocious flush of growth from the newly formed terminal bud in mid-summer. Weed control was the dominant factor influencing seedling survival and growth, accounting for 49 percent of the explained variation in seedling volume after two years. Weed control significantly conserved soil moisture and resulted in an increased number of seedlings exhibiting a second flush of growth. Fertilization through the addition of nitrogen had no effect when used in conjunction with weed control and had a negative effect when used without the benefit of weed control, Seedlings from the seed orchard source were significantly larger in diameter than the wild type source after two growing seasons, but were of similar height. Of the seedlings which were browsed twice by deer those with the benefit of weed control had over twice the stem volume of those without the benefit of weed control. Lammas growth contributed to the stem volume response to weed control by additional height growth, thus allowing the seedlings to recover from and escape the effects of deer browse.
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