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Net Erosion on a Sagebrush Steppe Landscape as Determined by Cesium-137 Distribution

Dep. of Botany, Box 3165, Univ. Station, Univ. of Wyoming, Laramie, WY 82070

I. C. Burke^*

Forest and Wood Science Dep. and Natural Resource Ecology Lab., Colorado State Univ., Ft. Collins, CO 80523

R. K. Olson

U.S. Environmental Protection Agency, Environmental Res. Lab., Corvallis, OR 97333

* Corresponding author.

ABSTRACT

Soil erosion plays a major role in structuring landscapes of semiarid regions. The purpose of this study was to examine patterns and assess transport mechanisms of soil erosion and deposition in a native sagebrush steppe landscape in south central Wyoming using ¹³⁷Cs. Six landscape units were identified using a cluster analysis based on four landscape variables. Cesium-137 values varied little among landscape units, suggesting that intermediate-scale (approximately 100 m) fluvial and eolian soil transport is unimportant in this system during the time since bomb-test ¹³⁷Cs deposition occurred. In contrast, analysis of variance showed that, on windswept landscape positions, ¹³⁷Cs was significantly higher under shrubs than between them. These differences suggest that wind-driven redistribution has occurred at a small scale (0.5–10 m). Even though ¹³⁷Cs data indicate that intermediate-scale transport is not occurring, analysis of the soil fine fraction across the landscape shows net transport of fines downslope, suggesting that, in this sagebrush ecosystem, soil redistribution by fluvial erosion occurs too slowly to be determined by ¹³⁷Cs.

Received for publication February 26, 1990.

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