Graduate Thesis Or Dissertation

 

Microsite selection of resident and invading plant species following logging and slash burning on Douglas fir clear-cuts in the Oregon Coast Range Public Deposited

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  • In 1967 an investigation seeking to understand the disturbance effects produced by broadcast slash burning was conducted on Douglas fir clear-cuts in the Harlan area of the Siuslaw National Forest. Specifically, this study was concerned with the effects disturbance has on the growth (spatial) patterns and the replacement (time) patterns of the plant species found in the early successional stages. The study was conducted on two Douglas fir clear-cuts, one logged in 1966 and slash burned in 1967 and the other was logged in 1965 and slash burned in 1966. All sampling was done in 1968; one and two years after slash burning. The disturbance conditions were defined as being unburned or burned, and five 15' x 15' plots were placed on unburned soil sites and five 15' x 15' plots were also placed on burned soil sites on both clear-cuts, creating a two-year successional sequence. Each plot was subdivided into 25 3' x 3' subplots, 11 of these subplots randomly selected to be sampled. Each subplot was then divided into nine 1' x microplots, giving a total of 99 microplots per plot. Frequency data on the occurring species was obtained by counting the number of subdivisions within which a specie occurred and expressing this as a percentage of the total number of subdivisions (99). Tabular ordination of frequency values for presenting and newly established species according to the two disturbance conditions (burned and unburned) provide a basis for an evaluation of the relative tolerance of these species to microenvironments within the clear-cut. Species preferring burned sites one year after burning include Senecio sylvaticus, Funaria hygrometrica, Montia sibirica, Senecio jacobea, Epilobium adenocaulon, Sonchus asper, and Erechites prenanthoides. Two years after burning Epilobium minutum may be added to the species listed above. There also was a group of species found to prefer the unburned sites which result from the mechanical removal of logs. Species found consistently in this situation on the clear-cut, sampled two years after logging (one year after broadcast burning on the clear-cut) include Agrostis exarata, Rubus parviflorus, Carex festivilla, Crepis setosa, and Hypochoeris radicata. For disturbed but unburned locations within the clear-cut three years after cutting (two years after broadcast burning on the clear-cut), Luzula campestris and Holcus lanatus may be added to the above list. A wide variety of remnant plant assemblages and microsites are characteristic of the aftermath of logging and burning on clear-cuts--particularly during the first years following disturbance. A sample ordination of microsites according to frequency of occurrence of plant species provides a basis for comparing the relative compatibility of a species to logging and burning effects. This limited analysis sugests a relatively narrow place and time niche requirement of certain plant species occupying Douglas fir clear-cuts during the first three years following logging and burning.
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