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Anthropogenic N deposition increases soil organic matter accumulation without altering its biochemical composition
dc.contributor.authorZak, Donald R.
dc.contributor.authorFreedman, Zachary B.
dc.contributor.authorUpchurch, Rima A.
dc.contributor.authorSteffens, Markus
dc.contributor.authorKögel‐knabner, Ingrid
dc.date.accessioned2017-02-02T22:02:08Z
dc.date.available2018-04-02T18:03:23Zen
dc.date.issued2017-02
dc.identifier.citationZak, Donald R.; Freedman, Zachary B.; Upchurch, Rima A.; Steffens, Markus; Kögel‐knabner, Ingrid (2017). "Anthropogenic N deposition increases soil organic matter accumulation without altering its biochemical composition." Global Change Biology 23(2): 933-944.
dc.identifier.issn1354-1013
dc.identifier.issn1365-2486
dc.identifier.urihttps://hdl.handle.net/2027.42/136051
dc.description.abstractAccumulating evidence indicates that future rates of atmospheric N deposition have the potential to increase soil C storage by reducing the decay of plant litter and soil organic matter (SOM). Although the microbial mechanism underlying this response is not well understood, a decline in decay could alter the amount, as well as biochemical composition of SOM. Here, we used sizeâ density fractionation and solidâ state 13Câ NMR spectroscopy to explore the extent to which declines in microbial decay in a longâ term (ca. 20 yrs.) N deposition experiment have altered the biochemical composition of forest floor, bulk mineral soil, as well as free and occluded particulate organic matter. Significant amounts of organic matter have accumulated in occluded particulate organic matter (~20%; oPOM); however, experimental N deposition had not altered the abundance of carboxyl, aryl, alkyl, or O/Nâ alkyl C in forest floor, bulk mineral soil, or any soil fraction. These observations suggest that biochemically equivalent organic matter has accumulated in oPOM at a greater rate under experimental N deposition, relative to the ambient treatment. Although we do not understand the process by which experimental N deposition has fostered the occlusion of organic matter by mineral soil particles, our results highlight the importance of interactions among the products of microbial decay and the chemical and physical properties of silt and clay particles that occlude organic matter from microbial attack. Because oPOM can reside in soils for decades to centuries, organic matter accumulating under future rates of anthropogenic N deposition could remain in soil for long periods of time. If temperate forest soils in the Northern Hemisphere respond like those in our experiment, then unabated deposition of anthropogenic N from the atmosphere has the potential to foster greater soil C storage, especially in fineâ texture forest soils.
dc.publisherMacmillan Publishing Co, Inc
dc.publisherWiley Periodicals, Inc.
dc.subject.othersoil C storage
dc.subject.otherparticulate organic matter
dc.subject.othersoil organic matter
dc.subject.otheranthropogenic N deposition
dc.subject.other13Câ NMR
dc.titleAnthropogenic N deposition increases soil organic matter accumulation without altering its biochemical composition
dc.typeArticleen_US
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelGeology and Earth Sciences
dc.subject.hlbsecondlevelEcology and Evolutionary Biology
dc.subject.hlbtoplevelScience
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/136051/1/gcb13480_am.pdf
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/136051/2/gcb13480.pdf
dc.identifier.doi10.1111/gcb.13480
dc.identifier.sourceGlobal Change Biology
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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