Abstract
The δ 34S values of two dominant xerophytes, Atriplex hymenehytra and Larrea tridentata, in Death Valley, California, vary similarly from +7 to +18‰, corresponding isotopically to sulfate in the water supplies at a given location. Going radially outwards, tree ring data from a phreatophyte tree, Tamarix aphylla, show a distinct time dependence, with δ 34S values increasing from +13.5 to +18‰ for soluble sulfate and from +12 to +17‰ for total sulfur. These data are interpreted in terms of sulfur sources, water sources and flow paths, and tree root growth.
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