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Organo–organic and organo–mineral interfaces in soil at the nanometer scale

Journal Article · · Nature Communications
 [1];  [2];  [1];  [2];  [3];  [3];  [4]
  1. Cornell Univ., Ithaca, NY (United States). School of Integrative Plant Science. Soil and Crop Sciences
  2. Cornell Univ., Ithaca, NY (United States). School of Applied and Engineering Physics
  3. Cornell Univ., Ithaca, NY (United States). School of Applied and Engineering Physics; Cornell Univ., Ithaca, NY (United States). Kavli Inst. at Cornell for Nanoscale Science
  4. Cornell Univ., Ithaca, NY (United States). School of Applied and Engineering Physics; Technical Univ. of Munich (Germany). Inst. for Advanced Study; Cornell Atkinson Center for Sustainability, Ithaca, NY (United States)

The capacity of soil as a carbon (C) sink is mediated by interactions between organic matter and mineral phases. However, previously proposed layered accumulation of organic matter within aggregate organo–mineral microstructures has not yet been confirmed by direct visualization at the necessary nanometer-scale spatial resolution. Here, we identify disordered micrometer-size organic phases rather than previously reported ordered gradients in C functional groups. Using cryo-electron microscopy with electron energy loss spectroscopy (EELS), we show organo–organic interfaces in contrast to exclusively organo–mineral interfaces. Single-digit nanometer-size layers of C forms were detected at the organo–organic interface, showing alkyl C and nitrogen (N) enrichment (by 4 and 7%, respectively). At the organo–mineral interface, 88% (72–92%) and 33% (16–53%) enrichment of N and oxidized C, respectively, indicate different stabilization processes than at organo–organic interfaces. However, N enrichment at both interface types points towards the importance of N-rich residues for greater C sequestration.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF); Technical University of Munich Institute for Advanced Study
Grant/Contract Number:
AC05-00OR22725; SC0001086
OSTI ID:
1787007
Alternate ID(s):
OSTI ID: 1814248
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 11; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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