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Lime and/or Phosphate Application Affects the Stability of Soil Organic Carbon : Evidence from Changes in Quantity and Chemistry of the Soil Water-Extractable Organic Matter

Li, Yang ; Wang, Tao LU ; Camps-Arbestain, Marta ; Suárez-Abelenda, Manuel and Whitby, Catherine P. (2020) In Environmental Science & Technology 54(21). p.13908-13916
Abstract

The mechanisms by which lime and/or phosphate addition impacts the preservation of soil organic matter (OM) are poorly understood. We explored the changes in quantity and chemistry of water-extractable organic matter (WEOM) in the bulk soil and its heavy density fraction (>1.6 g/cm3) of an unmanaged C-rich volcanic soil caused by lime and/or phosphate application. The addition of lime or phosphate caused (i) a significant increase in the WEOM, along with a decrease in its C/N ratio and an increase in its aromaticity, and (ii) changes in the WEOM chemical composition, measured with pyrolysis-gas chromatography/mass spectrometry, this being most impacted by lime application. The combined effect of lime and phosphate addition on the... (More)

The mechanisms by which lime and/or phosphate addition impacts the preservation of soil organic matter (OM) are poorly understood. We explored the changes in quantity and chemistry of water-extractable organic matter (WEOM) in the bulk soil and its heavy density fraction (>1.6 g/cm3) of an unmanaged C-rich volcanic soil caused by lime and/or phosphate application. The addition of lime or phosphate caused (i) a significant increase in the WEOM, along with a decrease in its C/N ratio and an increase in its aromaticity, and (ii) changes in the WEOM chemical composition, measured with pyrolysis-gas chromatography/mass spectrometry, this being most impacted by lime application. The combined effect of lime and phosphate addition on the quantity and chemistry of WEOM was larger than the effects of separate lime and phosphate additions. By comparing the response of the bulk soil and the heavy fraction, we infer that phosphate has a greater contribution to the destabilization of vulnerable particulate OM, while lime causes a comparable disruption in the particulate OM and that in the heavy fraction. These findings provide a mechanistic insight into the decreased OM stability after liming and/or P fertilizing Andosols. They have implications for designing climate-smart management practices for these soils.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Environmental Science & Technology
volume
54
issue
21
pages
9 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85095460953
  • pmid:33054212
ISSN
1520-5851
DOI
10.1021/acs.est.0c01341
language
English
LU publication?
yes
id
1782a882-6ea4-46b5-88d3-01c334973486
date added to LUP
2020-11-13 11:36:44
date last changed
2024-03-05 13:39:46
@article{1782a882-6ea4-46b5-88d3-01c334973486,
  abstract     = {{<p>The mechanisms by which lime and/or phosphate addition impacts the preservation of soil organic matter (OM) are poorly understood. We explored the changes in quantity and chemistry of water-extractable organic matter (WEOM) in the bulk soil and its heavy density fraction (&gt;1.6 g/cm3) of an unmanaged C-rich volcanic soil caused by lime and/or phosphate application. The addition of lime or phosphate caused (i) a significant increase in the WEOM, along with a decrease in its C/N ratio and an increase in its aromaticity, and (ii) changes in the WEOM chemical composition, measured with pyrolysis-gas chromatography/mass spectrometry, this being most impacted by lime application. The combined effect of lime and phosphate addition on the quantity and chemistry of WEOM was larger than the effects of separate lime and phosphate additions. By comparing the response of the bulk soil and the heavy fraction, we infer that phosphate has a greater contribution to the destabilization of vulnerable particulate OM, while lime causes a comparable disruption in the particulate OM and that in the heavy fraction. These findings provide a mechanistic insight into the decreased OM stability after liming and/or P fertilizing Andosols. They have implications for designing climate-smart management practices for these soils.</p>}},
  author       = {{Li, Yang and Wang, Tao and Camps-Arbestain, Marta and Suárez-Abelenda, Manuel and Whitby, Catherine P.}},
  issn         = {{1520-5851}},
  language     = {{eng}},
  number       = {{21}},
  pages        = {{13908--13916}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Environmental Science & Technology}},
  title        = {{Lime and/or Phosphate Application Affects the Stability of Soil Organic Carbon : Evidence from Changes in Quantity and Chemistry of the Soil Water-Extractable Organic Matter}},
  url          = {{http://dx.doi.org/10.1021/acs.est.0c01341}},
  doi          = {{10.1021/acs.est.0c01341}},
  volume       = {{54}},
  year         = {{2020}},
}