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Biogeochemistry

, Volume 117, Issue 2–3, pp 337–350 | Cite as

Nitrogen input quality changes the biochemical composition of soil organic matter stabilized in the fine fraction: a long-term study

  • A. W. GillespieEmail author
  • A. Diochon
  • B. L. Ma
  • M. J. Morrison
  • L. Kellman
  • F. L. Walley
  • T. Z. Regier
  • D. Chevrier
  • J. J. Dynes
  • E. G. Gregorich
Article

Abstract

The chemical composition of soil organic matter (SOM) is a key determinant of its biological stability. Our objective in this study was to evaluate the effects of various sources of supplemental N on the chemical composition of SOM in the fine (<5 μm) mineral fraction. Treatments were fallow, maize/soybean in rotation, and continuous maize receiving no fertilizer (maize0N), synthetic fertilizer N (maize + N), or composted manure (maize + manure). The chemical structures in SOM associated with the fine fraction were determined using XANES spectroscopy at the C and N K-edges, which was assessed using multidimensional scaling. Analysis of amino sugar biomarkers were used to evaluate the fungal:bacterial contributions to the SOM. The addition of N to soils (i.e., maize + N, maize + manure, and maize/soybean treatments) resulted in the enrichment of proteinaceous compounds. Soils which did not receive supplemental N (i.e., fallow and maize0N treatments) were enriched in plant-derived compounds (e.g., aromatics, phenolics, carboxylic acids and aliphatic compounds), suggesting that decomposition of plant residues was constrained by N-limitation. Microbial populations assessed by amino sugar biomarker ratios showed that the highest contributions to SOM by bacteria occurred in the maize + manure treatment (high N input), and by fungi in the fallow treatment (low N input). The SOM in the maize + N and maize/soybean treatments was enriched in N-bonded aromatics; we attribute this enrichment to the abiotic reaction of inorganic N with organic C structures. The SOM in the maize + manure treatment was enriched in pyridinic-N, likely as a result of intense microbial processing and high SOM turnover. The presences of signals for ketone and pyrrole compounds in XANES spectra suggest their use as biomarkers for microbially transformed and stabilized SOM. The SOM in the maize + manure treatment was enriched in ketones which are likely microbial by-products of fatty acid catabolism. Pyrrole compounds, which may accumulate over the long term as by-products of protein transformations by an N-limited microbial community, were dominant in the fallow soil. A combination of molecular spectroscopy and biomarker analysis showed that the source of supplemental N to soil influences the stable C- and N-containing compounds of SOM in a long-term field study. Indeed, any increase in N availability allowed the microbial community to transform plant material into microbial by-products which occur as stable SOM compounds in the fine soil fraction.

Keywords

Soil carbon Nitrogen Clay fraction Fertilization Amino sugars XANES 

Notes

Acknowledgments

Research described in this paper was performed at the Canadian Light Source Inc., which is supported by the Natural Sciences and Engineering Research Council of Canada, the National Research Council Canada, the Canadian Institutes of Health Research, the Province of Saskatchewan, Western Economic Diversification Canada, and the University of Saskatchewan. Amino sugar analysis at Agriculture and Agri-Food Canada was conducted by A. Spasojevic, S.S. Wu and A. Fok. A.W. Gillespie, B.L. Ma, M.J. Morrison and E.G. Gregorich acknowledge financial support for this research through Agriculture and Agri-Food Canada’s Science and Technology Branch and the SAGES program.

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Copyright information

© UK Crown 2013

Authors and Affiliations

  • A. W. Gillespie
    • 1
    Email author
  • A. Diochon
    • 2
  • B. L. Ma
    • 1
  • M. J. Morrison
    • 1
  • L. Kellman
    • 3
  • F. L. Walley
    • 4
  • T. Z. Regier
    • 5
  • D. Chevrier
    • 5
  • J. J. Dynes
    • 5
  • E. G. Gregorich
    • 1
  1. 1.Science and Technology Branch, Agriculture and Agri-Food CanadaCentral Experimental FarmOttawaCanada
  2. 2.Department of GeologyLakehead UniversityThunder BayCanada
  3. 3.Department of Earth SciencesSt Francis Xavier UniversityAntigonishCanada
  4. 4.Department of Soil ScienceUniversity of SaskatchewanSaskatoonCanada
  5. 5.Canadian Light Source Inc.SaskatoonCanada

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