Decadal-scale soil redistribution along hillslopes in the Mojave Desert

O. Crouvi, V. O. Polyakov, Jon Pelletier, Craig Rasmussen

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

This study estimates the relative magnitude of decadal-scale soil redistribution (i.e., soil loss or gain) by slope wash using <sup>137</sup>Cs inventories measured in 46 soil profiles at four study sites in the Ft. Irwin area of the Mojave Desert of California, USA. The variability in <sup>137</sup>Cs inventories on a <5 m scale suggests that even for the same topographic position, there is large variation in runoff generation and flow continuity. Smaller average <sup>137</sup>Cs inventories that are suggestive of higher relative erosion rates are associated with more gently sloping sites that have a lower percentage of surficial rock-fragment and vegetation coverage. Individual <sup>137</sup>Cs inventories from all four sites are positively correlated with the percentage of rock fragments in the upper soil profile. The increase in rock-fragment cover (i.e., soil armoring) with increasing slope gradient appears to negate any potential increase in transport effectiveness with increasing slope steepness. This armoring, together with the sandy-loam soil texture characteristic of steeper slopes, hinders runoff and slope-wash erosion. Our findings are supported by soil data that suggest that these patterns are persistent for longer timescales (i.e., centuries and millennia).

Original languageEnglish (US)
Pages (from-to)251-264
Number of pages14
JournalEarth Surface Dynamics
Volume3
Issue number2
DOIs
StatePublished - Jun 4 2015

ASJC Scopus subject areas

  • Earth-Surface Processes
  • Geophysics

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