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000903159 1001_ $$0P:(DE-HGF)0$$aWang, Ye$$b0$$eCorresponding author
000903159 245__ $$aPhosphate oxygen isotope fingerprints of past biological activity in the Atacama Desert
000903159 260__ $$aNew York, NY [u.a.]$$bElsevier$$c2021
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000903159 520__ $$aThe Atacama Desert (Chile) is one of driest places on Earth, with a hyper-arid climate and less than 2 mm yr−1 precipitation; nevertheless, it has experienced rare periods of sporadic rainfall. These periods shortly enhanced vegetation growth and microbial activity, which must have utilized major nutrients such as phosphorus (P). However, any biological cycling of P involves an oxygen exchange with water, which should now reside in the hyperarid soils as tracer of life. In order to identify such evidences, we performed sequential P fractionation and analyzed the oxygen isotope composition of HCl-extractable phosphate (δ18OHCl–P) in the surface soil (0–15 cm) of a climatic gradient along the rising alluvial fans of the Central Depression to the Precordillera, Chile. At the driest sites, the δ18OHCl-P values were constant with depth and deviated from biologically-driven isotopic equilibrium. In contrast, we observed a considerable increase of δ18OHCl-P values below the soil surface at less arid sites, where some isotope values were even within the range of full isotopic equilibrium with biologically cycled phosphate. For the latter sites, this points to most efficient biological P cycling right below the uppermost surface of the desert. Critically, the absolute concentrations of this biologically cycled P exceeded those of P potentially stored in living microbial cells by at least two orders of magnitude. Therefore, our data provides evidence that δ18OHCl-P values trace not recent but past biological activity, making it a powerful tool for assessing the existence, pathways and evolution of life in such arid ecosystems on Earth and, thus, potentially on other planets such as Mars.
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000903159 7001_ $$0P:(DE-Juel1)171623$$aMoradi, Ghazal$$b1
000903159 7001_ $$0P:(DE-Juel1)129484$$aKlumpp, Erwin$$b2
000903159 7001_ $$0P:(DE-HGF)0$$avon Sperber, Christian$$b3
000903159 7001_ $$0P:(DE-HGF)0$$aTamburini, Federica$$b4
000903159 7001_ $$00000-0002-5652-1169$$aRitter, Benedikt$$b5
000903159 7001_ $$0P:(DE-HGF)0$$aFuentes, Barbara$$b6
000903159 7001_ $$0P:(DE-Juel1)129427$$aAmelung, Wulf$$b7
000903159 7001_ $$0P:(DE-Juel1)145865$$aBol, Roland$$b8
000903159 773__ $$0PERI:(DE-600)1483679-8$$a10.1016/j.gca.2021.07.027$$gVol. 311, p. 1 - 11$$p1 - 11$$tGeochimica et cosmochimica acta$$v311$$x0016-7037$$y2021
000903159 8564_ $$uhttps://juser.fz-juelich.de/record/903159/files/Invoice_W1578451_E_LETT4_14_12693835%20%20_EU.pdf
000903159 8564_ $$uhttps://juser.fz-juelich.de/record/903159/files/WangetalpostprintGCA.pdf$$yPublished on 2021-07-28. Available in OpenAccess from 2023-07-28.
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