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Variability of Nitrogen and Carbon in Surface Soils of Six Forest Types in the Oregon Cascades¹

ABSTRACT

Soil samples were collected from sites typical of six forest habitat types in the western Oregon Cascades to determine the variability in total N, C, and mineralizable N. Within each type, 20 samples of surface soil (0-15 cm deep) were removed from around the outside perimeter of a 0.25-ha plot. Averages of 23, 28, and 70 samples were needed to estimate the population mean of total N, C, and mineralizable N, respectively, with an accuracy of ±10% at a 95% probability. Variability was not reduced by reporting data on the basis of mass per area rather than concentration, but the method of reporting data affected the relative ranking of sites. Within-site variability was not generally related to microsite differences in slope or coarse fragment content.

¹ Paper 2026 of the Forest Research Laboratory, Oregon State University, Corvallis.

² Extension Watershed Specialist, Forestry Intensified Research Program, Dep. of Forest Engineering, Oregon State Univ., Medford, OR 97501; Associate Professor, Dep. of Forest Science, Oregon State Univ., Corvallis, OR 97331; and Principal Soil Scientist, USDA Forest Service, Pacific Northwest Forest and Range Experiment Station, Corvallis, OR 97331.

Received for publication July 29, 1985.

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