Graduate Thesis Or Dissertation
 

The clonal development of vine maple during Douglas-fir stand development in the Coast Range of Oregon

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/j67317737

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  • Natural Douglas-fir stand development is the result of many types of disturbance, both natural and management induced. The magnitude and timing of these disturbances have profound effects on the structure and composition of both the overstory and understory plant communities. Vine maple responds to disturbance by basal sprouting, layering, producing seed and establishing seedlings. By means of clonal regeneration and seedling establishment, vine maple is able to maintain its presence from one stand to the next over a wide range of sites. Previous studies on vine maple have not quantified its or growth in relation to the structural changes which occur during stand development and secondary succession in Douglas-fir forests. A knowledge of vine maple clone development is needed to understand the processes of understory development in secondary succession, and to predict the results of thinning and other silvicultural practices in these forests. The objective of this study was to quantify changes in vine maple development in relation to Douglas-fir stand age and density. Also investigated were the effects of layering on clone development in Douglas-fir stands of different ages and under different management regimes. The second segment of this study was to examine layering more closely, in regards to the rate and pattern of root initiations, and the capability of severed stems to root. The clonal development of vine maple was found to be strongly related to stand age, with most developmental changes occurring during the first 50 years of stand development. Basal sprouting and layering are present throughout stand development, with basal sprouting present primarily in early stand development and layering in the later stages. Seed production and seedling establishment are present in all stages of stand development, except during the years immediately following crown closure. Clone regeneration was found to be strongly influenced by cultural practices common to forest management, such as commercial thinning and prescribed fire. These management treatments affect clone regeneration by controlling clone size and forest debris. These treatments also affect the timing of seedling presence and the abundance of seedlings in stands. In order to understand natural forest succession, and to predict the effect of management practices on stand development, it is important to understand how clonal understory plants, such as vine maple, reproduce and grow during different stages of stand development.
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