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Methods S1 Minirhizotron sampling and processing details – additional details about capturing and processing root images collected by the minirhizotron camera system as well as quality control efforts to minimize and document two potential sources of measurement error, errors in calibrating the camera system and in variation among people who digitized images.

Fig. S1 Additional information on soil water content in portions of the soil profile that most closely match those used in fine-root analyses.

Figs S2–S4 Fine root standing crop at three soil depth intervals for the three sampling locations (near shrubs of Ambrosia dumosa, and of Larrea tridentata, plus systematically through the plant community) at the Nevada desert FACE (free-air CO2 enrichment) facility (NDFF).

Table S1 Complete ANOVA results for analysis of annual fine root production and turnover indices

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