caa a22 4500 445384239 CHVBK 20180317143027.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10021-011-9414-1 doi (NATIONALLICENCE)springer-10.1007/s10021-011-9414-1 Transport of Carbon and Nitrogen Between Litter and Soil Organic Matter in a Northern Hardwood Forest [Elektronische Daten] [Timothy Fahey, Joseph Yavitt, Ruth Sherman, Peter Groffman, Melany Fisk, John Maerz] We used sugar maple litter double-labeled with 13C and 15N to quantify fluxes of carbon (C) and nitrogen (N) between litter and soil in a northern hardwood forest and the retention of litter C and N in soil. Two cohorts of litter were compared, one in which the label was preferentially incorporated into non-structural tissue and the other structural tissue. Loss of 13C from this litter generally followed dry mass and total C loss whereas loss of 15N (20-30% in 1year) was accompanied by large increases of total N content of this decaying litter (26-32%). Enrichment of 13C and 15N was detected in soil down to 10-15cm depth. After 6months of decay (November-May) 36-43% of the 13C released from the litter was recovered in the soil, with no differences between the structural and non-structural labeled litter. By October the percentage recovery of litter 13C in soil was much lower (16%). The C released from litter and remaining in soil organic matter (SOM) after 1year represented over 30g Cm−2y−1 of SOM accumulation. Recovery of litter 15N in soil was much higher than for C (over 90%) and in May 15N was mostly in organic horizons whereas by October it was mostly in 0-10cm mineral soil. A small proportion of this N was recovered as inorganic N (2-6%). Recovery of 15N in microbial biomass was higher in May (13-15%) than in October (about 5%). The C:N ratio of the SOM and microbial biomass derived from the labeled litter was much higher for the structural than the non-structural litter and for the forest floor than mineral SOM, illustrating the interactive role of substrates and microbial activity in regulating the C:N stoichiometry of forest SOM formation. These results for a forest ecosystem long exposed to chronically high atmospheric N deposition (ca. 10kgNha−1y−1) suggest possible mechanisms of N retention in soil: increased organic N leaching from fresh litter and reduced fungal transport of N from soil to decaying litter may promote N stabilization in mineral SOM even at a relatively low C:N ratio. Springer Science+Business Media, LLC, 2011 carbon nationallicence forest soil nationallicence litter decay nationallicence nitrogen nationallicence sugar maple nationallicence isotope tracer nationallicence Fahey Timothy Department of Natural Resources, Cornell University, 14583, Ithaca, New York, USA aut Yavitt Joseph Department of Natural Resources, Cornell University, 14583, Ithaca, New York, USA aut Sherman Ruth Department of Natural Resources, Cornell University, 14583, Ithaca, New York, USA aut Groffman Peter Cary Institute of Ecosystem Studies, 12545, Millbrook, New York, USA aut Fisk Melany Department of Zoology, Miami University, 45056, Oxford, Ohio, USA aut Maerz John Warnell School of Forestry and Natural Resources, University of Georgia, 30602, Athens, Georgia, USA aut Ecosystems Springer-Verlag 14/2(2011-03-01), 326-340 1432-9840 14:2<326 2011 14 10021 https://doi.org/10.1007/s10021-011-9414-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-011-9414-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fahey Timothy Department of Natural Resources, Cornell University, 14583, Ithaca, New York, USA aut NATIONALLICENCE 700 1- Yavitt Joseph Department of Natural Resources, Cornell University, 14583, Ithaca, New York, USA aut NATIONALLICENCE 700 1- Sherman Ruth Department of Natural Resources, Cornell University, 14583, Ithaca, New York, USA aut NATIONALLICENCE 700 1- Groffman Peter Cary Institute of Ecosystem Studies, 12545, Millbrook, New York, USA aut NATIONALLICENCE 700 1- Fisk Melany Department of Zoology, Miami University, 45056, Oxford, Ohio, USA aut NATIONALLICENCE 700 1- Maerz John Warnell School of Forestry and Natural Resources, University of Georgia, 30602, Athens, Georgia, USA aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag 14/2(2011-03-01), 326-340 1432-9840 14:2<326 2011 14 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer