Technical Report
 

Natural regeneration on staggered settings

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https://ir.library.oregonstate.edu/concern/technical_reports/r781wh29r

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  • In recent years much of the logging in the Douglas fir region has been by the staggered setting system. Consequently, the effects of this system upon natural coniferous regeneration have become increasingly important. This study was designed to analyze the effects of setting size and environmental factors upon natural regeneration of Douglas fir (Pseudotsuga taxifolia, Poir) and asso­ciated coniferous species. A number of settings in western Oregon were examined in 1953 and 1954. The following data were recorded for each mil-acre plot studied: number, age, and species of coniferous reproduction; distance from seed source; intensity of burn; intensity and type of plant cover; amount of slash; seedbed condition; and exposure. The effect of each of these factors was evaluated by statistical analysis of the field data. The results of the analysis indicated that: 1. There was no correlation between setting size and distance from seed source; there was little correlation between distance from seed source and occurrence of coniferous reproduction; therefore, no correlation exists between size of a staggered setting and speed of restocking. 2. For a given mil-acre plot the following environmental factors are favorable to the establishment of coniferous reproduction: no burri, northerly exposures, light slash cover, light herba­ceous cover. 3. For a given mil-acre plot the following environmental factors .are not favorable to the establishment of coniferous reproduc­tion: any degree of burn, southerly exposures, medium or heavy slash, and heavy herbaceous cover or woody plant cover.
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