Linking soil carbon saturation concepts to nitrogen retention and saturation

dc.contributor.author Castellano, Michael
dc.contributor.author Kaye, Jason
dc.contributor.author Castellano, Michael
dc.contributor.author Lin, Henry
dc.contributor.author Schmidt, John
dc.contributor.department Agronomy
dc.date 2018-02-18T21:51:11.000
dc.date.accessioned 2020-06-29T23:03:18Z
dc.date.available 2020-06-29T23:03:18Z
dc.date.issued 2012-01-01
dc.description.abstract <p>Recent advances in soil C saturation concepts have increased our understanding of soil C storage and mineralization without explicit links to N retention and saturation theories. Here, we exploit soil texture and organic matter (OM) gradients in a Maryland, USA hardwood forest to test hypotheses that link soil organic C saturation with soil <sup>15</sup>N retention and nitrification. At our site, mineral-associated OM (MAOM) N concentrations in the silt + clay particle fraction (g MAOM-N g silt + clay<sup>−1</sup>) were negatively correlated with the fraction of NH<sub>4</sub>-N transferred to MAOM during a 3-day in situ incubation (<em>R</em> = −0.85), but positively correlated with potential net nitrification (<em>R</em> = 0.76). Moreover, the fraction of NH<sub>4</sub>-N transferred to MAOM was negatively correlated with potential net nitrification (<em>R</em> = −0.76). Due to physico-chemical stabilization mechanisms, MAOM is considered to be resistant to mineralization. Carbon saturation theory suggests that the proportion of new C inputs that can be stabilized in MAOM decreases in proportion to the amount of C already present in the fraction; C inputs not stabilized in MAOM are susceptible to rapid mineralization. We demonstrate that NH<sub>4</sub>-N stabilization in MAOM is similar to C stabilization in MAOM and associated with nitrification, thereby extending soil C saturation theory to mineral N and linking it with N retention and saturation theories. These data and concepts complement N saturation models that emphasize vegetation type, N input levels, and microbial turnover. Incorporating the OM retention capacity of fine mineral particles into N saturation theory can improve predictions of N saturation rates and resolve inconsistent relationships between soil organic matter, texture, N mineralization, and N retention.</p>
dc.description.comments <p>This article is published as Castellano MJ, Kaye JP, Lin H, Schmidt JP. 2012. Linking soil carbon saturation concepts to nitrogen retention and saturation. <strong><em>Ecosystems</em></strong> doi: <a href="http://dx.doi.org/10.1007/s10021-011-9501-3" target="_blank" title="Linking soil carbon saturation concepts to nitrogen retention and saturation">10.1007/s10021-011-9501-3</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/195/
dc.identifier.articleid 1198
dc.identifier.contextkey 10649760
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/195
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/4527
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/195/2012_Castellano_LinkingSoil.pdf|||Fri Jan 14 21:57:17 UTC 2022
dc.source.uri 10.1007/s10021-011-9501-3
dc.subject.disciplines Agriculture
dc.subject.keywords soil
dc.subject.keywords texture
dc.subject.keywords net
dc.subject.keywords nitrification
dc.subject.keywords particulate organic matter
dc.subject.keywords nitrogen retention
dc.subject.keywords gross nitrogen mineralization
dc.subject.keywords gross nitrification
dc.title Linking soil carbon saturation concepts to nitrogen retention and saturation
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 1f34589d-68d7-4578-adfb-28caa0e9d604
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
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