Microspectroscopy reveals dust-derived apatite grains in acidic, highly-weathered Hawaiian soils

Vogel, Christian; Helfenstein, Julian; Massey, Michael S.; Sekine, Ryo; Kretzschmar, Ruben; Beiping, Luo; Peter, Thomas; Chadwick, Oliver A.; Tamburini, Federica; Rivard, Camille; Herzel, Hannes; Adam, Christian; Pradas del Real, Ana E.; Castillo-Michel, Hiram; Zuin, Lucia; Wang, Dongniu; Félix, Roberto; Lassalle-Kaiser, Benedikt; Frossard, Emmanuel. 2021 Microspectroscopy reveals dust-derived apatite grains in acidic, highly-weathered Hawaiian soils. Geoderma, 381, 114681. 11, pp.

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Dust deposition is an important source of phosphorus (P) to many ecosystems. However, there is little evidence of dust-derived P-containing minerals in soils. Here we studied P forms along a well-described climatic gradient on Hawaii, which is also a dust deposition gradient. Soil mineralogy and soil P forms from six sites along the climatic gradient were analyzed with bulk (X-ray diffraction and P K-edge X-ray absorption near edge structure) and microscale (X-ray fluorescence, P K-edge X-ray absorption near edge structure, and Raman) analysis methods. In the wettest soils, apatite grains ranging from 5 to 30 µm in size were co-located at the micro-scale with quartz, a known continental dust indicator suggesting recent atmospheric deposition. In addition to co-location with quartz, further evidence of dust-derived P included backward trajectory modeling indicating that dust particles could be brought to Hawaii from the major global dust-loading areas in central Asia and northern Africa. Although it is not certain whether the individual observed apatite grains were derived from long-distance transport of dust, or from local dust sources such as volcanic ash or windblown fertilizer, these observations offer direct evidence that P-containing minerals have reached surface layers of highly-weathered grassland soils through atmospheric deposition.

Item Type: Publication - Article
Digital Object Identifier (DOI):
UKCEH and CEH Sections/Science Areas: Unaffiliated
ISSN: 0016-7061
Additional Information. Not used in RCUK Gateway to Research.: Open Access paper - full text available via Official URL link.
Additional Keywords: phosphorus transformations, soil development, Aeolian dust inputs, P K-edge X-ray absorption spectroscopy, micro-Raman spectroscopy
NORA Subject Terms: Agriculture and Soil Science
Date made live: 27 Jan 2021 12:08 +0 (UTC)

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