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Figure S1 Absolute element concentrations (p.p.b.; uncorrected for TOC) measured in each type of sample, averaged across sites. Bars are standard deviations of the mean of six sites (one star over the bar denotes data were available only for five sites, and two stars denote data were available for only four sites). Sample type legend (upper right): CruS, biological soil crust; NonC, non-crusted soil; UndrC, soil under the crust. Elements have been grouped according to concentration ranges. C is for total C (organic and inorganic fractions).

Table S1 Absolute element concentrations (p.p.b.; uncorrected for TOC) determined in the three sites from the Colorado Plateau (CP1, CP2, and CP3) according to sample type (CruS, crusted soil; UndrC, soil underneath the crust; NonC, non-crusted soil). BDL, below detection limit. All major, minor, and trace element concentrations have an analytical uncertainty of 10% or better (1 s.d.).

Table S2 Absolute element concentrations (p.p.b.; uncorrected for TOC) determined in the three sites from the Sonoran Desert (SD8, SD9, and SD18) according to sample type (CruS, crusted soil; UndrC, soil underneath the crust; NonC, non-crusted soil). All major, minor, and trace element concentrations have an analytical uncertainty of 10% or better (1 s.d.).

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GBI_204_sm_FigS1.doc607KSupporting info item

Please note: Wiley Blackwell is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.