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Sci Adv. 2017 Dec 6;3(12):eaao1588. doi: 10.1126/sciadv.aao1588. eCollection 2017 Dec.

Global patterns of dust and bedrock nutrient supply to montane ecosystems.

Author information

1
Department of Geology and Geophysics, University of Wyoming, Laramie, WY 82071, USA.
2
Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA.

Abstract

A global compilation of erosion rates and modeled dust fluxes shows that dust inputs can be a large fraction of total soil inputs, particularly when erosion is slow and soil residence time is therefore long. These observations suggest that dust-derived nutrients can be vital to montane ecosystems, even when nutrient supply from bedrock is substantial. We tested this hypothesis using neodymium isotopes as a tracer of mineral phosphorus contributions to vegetation in the Sierra Nevada, California, where rates of erosion and dust deposition are both intermediate within the global compilation. Neodymium isotopes in pine needles, dust, and bedrock show that dust contributes most of the neodymium in vegetation at the site. Together, the global data sets and isotopic tracers confirm the ecological significance of dust in eroding mountain landscapes. This challenges conventional assumptions about dust-derived nutrients, expanding the plausible range of dust-reliant ecosystems to include many temperate montane regions, despite their relatively high rates of erosion and bedrock nutrient supply.

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