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Mycorrhizal weathering of apatite as an important calcium source in base-poor forest ecosystems

dc.contributor.authorBlum, Joel Den_US
dc.contributor.authorKlaue, A.en_US
dc.contributor.authorNezat, C. A.en_US
dc.contributor.authorDriscoll, Charles T.en_US
dc.contributor.authorJohnson, C. E.en_US
dc.contributor.authorSiccama, Thomas G.en_US
dc.contributor.authorEagar, C.en_US
dc.contributor.authorFahey, T. J.en_US
dc.contributor.authorLikens, Gene E.en_US
dc.date.accessioned2009-06-01T17:27:11Z
dc.date.available2009-06-01T17:27:11Z
dc.date.issued2002-06-13en_US
dc.identifier.citationBlum, JD; Klaue, A; Nezat, CA; Driscoll, CT; Johnson, CE; Siccama, TG; Eagar, C; Fahey, TJ; Likens, GE. (2002) "Mycorrhizal weathering of apatite as an important calcium source in base-poor forest ecosystems." Nature 417(6890): 729-731. <http://hdl.handle.net/2027.42/62621>en_US
dc.identifier.issn0028-0836en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/62621
dc.identifier.urihttp://www.ncbi.nlm.nih.gov/sites/entrez?cmd=retrieve&db=pubmed&list_uids=12066181&dopt=citationen_US
dc.description.abstractThe depletion of calcium in forest ecosystems of the northeastern USA(1-3) is thought to be a consequence of acidic deposition and to be at present restricting the recovery of forest and aquatic systems(4-7) now that acidic deposition itself is declining. This depletion of calcium has been inferred from studies(1-3) showing that sources of calcium in forest ecosystems-namely, atmospheric deposition and mineral weathering of silicate rocks such as plagioclase, a calcium-sodium silicate-do not match calcium outputs observed in forest streams. It is therefore thought that calcium is being lost from exchangeable and organically bound calcium in forest soils. Here we investigate the sources of calcium in the Hubbard Brook experimental forest, through analysis of calcium and strontium abundances and strontium isotope ratios within various soil, vegetation and hydrological pools. We show that the dissolution of apatite (calcium phosphate) represents a source of calcium that is comparable in size to known inputs from atmospheric sources and silicate weathering. Moreover, apatite-derived calcium was utilized largely by ectomycorrhizal tree species, suggesting that mycorrhizae may weather apatite and absorb the released ions directly, without the ions entering the exchangeable soil pool. Therefore, it seems that apatite weathering can compensate for some of the calcium lost from base-poor ecosystems, and should be considered when estimating soil acidification impacts and calcium cycling.en_US
dc.format.extent34293 bytes
dc.format.extent2489 bytes
dc.format.mimetypeapplication/octet-stream
dc.format.mimetypetext/plain
dc.publisherNature Publishing Groupen_US
dc.sourceNatureen_US
dc.titleMycorrhizal weathering of apatite as an important calcium source in base-poor forest ecosystemsen_US
dc.typeArticleen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumUniv Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USAen_US
dc.contributor.affiliationotherSyracuse Univ, Dept Civil & Environm Engn, Syracuse, NY 13244 USAen_US
dc.contributor.affiliationotherYale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USAen_US
dc.contributor.affiliationotherUS Forest Serv, NE Res Stn, USDA, Durham, NH 03824 USAen_US
dc.contributor.affiliationotherCornell Univ, Dept Nat Resources, Ithaca, NY 14853 USAen_US
dc.contributor.affiliationotherInst Ecosyst Studies, Millbrook, NY 12545 USAen_US
dc.identifier.pmid12066181en_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/62621/1/419777b.pdf
dc.identifier.doihttp://dx.doi.org/10.1038/419777ben_US
dc.identifier.sourceNatureen_US
dc.owningcollnameInterdisciplinary and Peer-Reviewed


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