IntensIve sIlvIculture - Forest Science Labs - Research Network ...
IntensIve sIlvIculture - Forest Science Labs - Research Network ...
IntensIve sIlvIculture - Forest Science Labs - Research Network ...
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178<br />
growth<br />
soil properties<br />
Abstract: In studies in SW Oregon, measured and potential heights were similar for 5-yrold<br />
planted seedlings of Douglas fir (Pseudotsuga menziesii) on areas that had been broadcast<br />
burned. Measured heights were less than potential heights on most of the pile-and-burn<br />
plantations, suggesting that site quality is damaged by this site preparation method.<br />
404. Minore, D. 1986b. Germination, survival and early growth of conifer seedlings in two habitat<br />
types. Pacific-Northwest-<strong>Forest</strong>-and-Range-Experiment-Station,-USDA-<strong>Forest</strong>-Service <strong>Research</strong>-<br />
Paper PNW-RP-348. ii + 25 p.<br />
Keywords: planting operations<br />
reproduction<br />
tree/stand health<br />
growth<br />
Abstract: Seed germination, and seedling survival and early growth of Douglas fir, western<br />
hemlock, Abies procera and A. amabilis were studied on clear felled sites in the A.<br />
amabilis/Achlys triphylla and A. amabilis/Vaccinium membranaceum/Xerophyllum tenax habitat<br />
types in the McKenzie River basin, Oregon. Severe seed predation and high surface soil temp. in<br />
both habitat types resulted in almost total seedling mortality during the first season when seeds<br />
had been sown on a few large, consolidated seedbeds. Seedling survival was n.s.d. between<br />
habitat types. Survival of Douglas fir (the only species tested) was better when seeds were sown<br />
in small scattered spots. Habitat type and addition of forest humus did not affect survival and<br />
growth, but shading by stumps and protection from predation using plastic berry baskets were<br />
both beneficial. Soils from both habitats had similar colour, texture, pH and nutrient content. In<br />
greenhouse studies, seeds of all species began germinating earlier and continued to germinate for<br />
longer in soil from Achlys sites than in soil from Xerophyllum sites. It is suggested that<br />
unmeasured biological activity may have been responsible for differences in germination activity<br />
between the two soil types.<br />
405. Minore, D. and H.G. Weatherly. 1990. Effects of site preparation on Douglas-fir seedling growth<br />
and survival. Western-Journal-of-Applied-<strong>Forest</strong>ry 5(2): 49-51.<br />
Keywords: site preparation<br />
mechanical preparation<br />
prescribed fire<br />
growth<br />
tree/stand health<br />
soil properties<br />
Abstract: The effects of 5 site preparation treatment combinations (A: cable yarding +<br />
broadcast burning - B: tractor yarding + broadcast burning - C: machine piling + broadcast<br />
burning - D: machine piling + off-site burning - and E: machine piling + off-site burning + tilling)<br />
on Douglas fir (Pseudotsuga menziesii) growth and survival were studied in 1984-87. Seedling<br />
height, potential seedling height, survival percentages, soil-penetration resistances, and<br />
occurrence of visible soil humus were evaluated on 149 progeny-test plantations in western<br />
Oregon. Survival was not improved by mechanical site preparation (survival at 5 years was<br />
84.8% for treatment A, 73.7% for C and 78.1% for E). Seedlings grown on compacted soils with<br />
low humus, associated with piling slash off site, did not grow as tall during their first 5 years as
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