Ecosystem-bedrock interaction changes nutrient compartmentalization during early oxidative weathering
AuthorZaharescu, Dragos G
Burghelea, Carmen I
Presler, Jennifer K
Hunt, Edward A
Domanik, Kenneth J
Amistadi, Mary K
Munoz, Elise N
Gaddis, Emily E
Vaquera-Ibarra, María O
Palacios-Menendez, Maria A
Roldán-Nicolau, Estefanía C
Maier, Raina M
Reinhard, Christopher T
AffiliationUniv Arizona, Biosphere
Univ Arizona, Dept Environm Sci
Univ Arizona, Lunar & Planetary Lab
Univ Arizona, Arizona Lab Emerging Contaminants
Univ Arizona, Honors Coll
MetadataShow full item record
PublisherNATURE PUBLISHING GROUP
CitationZaharescu, D.G., Burghelea, C.I., Dontsova, K. et al. Ecosystem-bedrock interaction changes nutrient compartmentalization during early oxidative weathering. Sci Rep 9, 15006 (2019) doi:10.1038/s41598-019-51274-x
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AbstractEcosystem-bedrock interactions power the biogeochemical cycles of Earth's shallow crust, supporting life, stimulating substrate transformation, and spurring evolutionary innovation. While oxidative processes have dominated half of terrestrial history, the relative contribution of the biosphere and its chemical fingerprints on Earth's developing regolith are still poorly constrained. Here, we report results from a two-year incipient weathering experiment. We found that the mass release and compartmentalization of major elements during weathering of granite, rhyolite, schist and basalt was rock-specific and regulated by ecosystem components. A tight interplay between physiological needs of different biota, mineral dissolution rates, and substrate nutrient availability resulted in intricate elemental distribution patterns. Biota accelerated CO2 mineralization over abiotic controls as ecosystem complexity increased, and significantly modified the stoichiometry of mobilized elements. Microbial and fungal components inhibited element leaching (23.4% and 7%), while plants increased leaching and biomass retention by 63.4%. All biota left comparable biosignatures in the dissolved weathering products. Nevertheless, the magnitude and allocation of weathered fractions under abiotic and biotic treatments provide quantitative evidence for the role of major biosphere components in the evolution of upper continental crust, presenting critical information for large-scale biogeochemical models and for the search for stable in situ biosignatures beyond Earth.
NoteOpen access journal
VersionFinal published version
SponsorsNational Science Foundation (NSF)National Science Foundation (NSF) [EAR-1023215]; NSFNational Science Foundation (NSF) [EAR-0724958, EAR-1331408, EAR-1411609]; Biosphere 2 REU program [NSF EAR-1263251, NSF EAR-1004353]; United States-Mexico Commission for Educational and Cultural Exchange (COMEXUS): the FulbrightGarcia Robles Scholarship program; Thomas R. Brown Foundation endowment; NASA Astrobiology Institute "CAN7: Alternative Earths. Explaining Persistent Inhabitation on a Dynamic Early Earth"; U.S. Department of Energy, Office of Science, Office of Basic Energy SciencesUnited States Department of Energy (DOE) [DE-AC02-76SF00515]
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