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Evaluation of Direct/Delayed Response Project Soil Sampling Classes: Northeastern United States

U.S. Forest Service, Northeastern Forest Experiment Station, Timber and Watershed Lab., Parsons, WV 26287

R.S. Turner

Environmental Sciences Division

D. D. Schmoyer

Computing and Telecommunications Division, Oak Ridge National Lab., Oak Ridge, TN 37831. Funded as part of the National Acid Precipitation Assessment Program by the U.S. Environmental Protection Agency under Interagency Agreement no. DW89931594-01-0 (1599-1599-85) with the U.S. Department of Energy under contract DE-AC05-84OR21400 with Martin Marietta Energy Systems, Inc. Publication no. 3796 of the Environmental Sciences Division, Oak Ridge National Lab.

ABSTRACT

The Direct/Delayed Response Project (DDRP) identified approximately 600 soils on 145 watersheds in the northeastern USA. Soils were assembled into 38 sampling classes, based on soil characteristics thought to influence surface water chemistry. Multivariate analysis techniques were used to evaluate the utility of the sampling classes. Hydrologic and chemical properties of soils were determined to be the most important for discriminating among the sampling classes. Although sampling class was a statistically significant effect for most soil chemistry variables, only a few sampling classes were particularly distinct (some Entisols, Histosols, and Inceptisols with high base saturation). For most variables, within-sampling-class variability was less than or equal to between-class variability, although this was not true for all of the characteristics evaluated. No better classification approaches were identified in this analysis. The DDRP sampling classes provide a means for grouping soils for efficiency in regional soil sampling, characterization, and aggregation to mapped areas.

^* Corresponding author.

Received for publication January 2, 1990.

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