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The Effect of Certain Site and Soil Factors on the Establishment of Douglas-Fir on the Tillamook Burn¹

ABSTRACT

This paper presents a preliminary report of studies dealing with soil moisture-seedling survival relationships conducted on the Tillamook Burn in northwestern Oregon during 1953. Ten one-fifth acre plots were selected from the current years planting program. Survival was calculated on the basis of total trees planted.

Factors investigated include: Percent slope, aspect, soil texture, structure, depth, organic matter content, and range of available moisture. Weather data were obtained from nearby lookouts. Soil moisture determinations were made weekly throughout the summer period.

Although there were not sufficient plots to establish statistical significance, certain factors were found to be affecting survival. Among these were aspect, percent slope, and soil texture. Southerly aspects coupled with coarse textured soils and slopes greater than 40% showed the highest mortality. On the other hand, northerly aspects, loam and silt loam textures and slopes less than 40% had excellent survival. Between these two extremes various gradations existed. In all cases where high mortality occurred, soils had been depleted of available moisture (below 15 atm.) for periods approaching 30 days.

¹ Contribution from the Department of Soils, Oregon State College, Corvallis. Approved for publication by the Director of the Oregon State College Forest Exp. Sta. Presented before Division V-A, Soil Science Society of America, St. Paul, Minn., Nov. 10, 1954.

² Graduate Research Assistant and Associate Forest Soils Scientist, Oregon State College. The authors wish to acknowledge the aid rendered by Messrs. R. M. Kallander, John H. Hann, and Adolph Berglund in certain phases of the study. Financial aid was provided through funds granted by the Oregon State Board of Forestry and the Forest Protection and Conservation Committee.

Received for publication October 26, 1954.