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Type and quantity of organic amendments determine the amount of carbon stabilized in particle-size fractions of a semiarid degraded soil

Nicolás, César LU ; Hernández, Teresa and García, Carlos (2017) In Arid Land Research and Management 31(1). p.14-28
Abstract

A 9-month lab experiment was carried out with three different amendments (vine pruning wastes, PW; composted vine pruning wastes, cPW; and sewage sludge, SS) added at three different rates (90, 180, and 240 t ha−1, dry weight) in order to test whether the type or the quantity of the amendments applied to a semiarid, degraded soil determined the Corg accumulation in its particle-size fractions (coarse sand, 200–2,000 µm; fine sand, 63–200 µm; silt, 2–63 µm; and clay, 0.1–2 µm). All amendments, independently of their C/N ratios, resulted in similar Corg content and accumulation in coarse sand and silt-sized fractions after 9 months. In the clay-sized fraction, enrichment in Corg produced the... (More)

A 9-month lab experiment was carried out with three different amendments (vine pruning wastes, PW; composted vine pruning wastes, cPW; and sewage sludge, SS) added at three different rates (90, 180, and 240 t ha−1, dry weight) in order to test whether the type or the quantity of the amendments applied to a semiarid, degraded soil determined the Corg accumulation in its particle-size fractions (coarse sand, 200–2,000 µm; fine sand, 63–200 µm; silt, 2–63 µm; and clay, 0.1–2 µm). All amendments, independently of their C/N ratios, resulted in similar Corg content and accumulation in coarse sand and silt-sized fractions after 9 months. In the clay-sized fraction, enrichment in Corg produced the incorporation of particles from this particle-size fraction into the silt-sized fraction. Likewise, increasing the application rates of the amendments led to larger Corg contents into the particle-size fractions of all amended soils except for the clay-sized fraction. The application of SS resulted in lower basal respiration-to-Corg ratios in the clay-sized fraction than the application of PW and cPW, suggesting a higher protection of the Corg in the SS treatment. These results indicate that organic amendments from woody plants with C/N ratios higher than 30, such as PW, favor Corg accumulation in the fine sand-sized fractions. Furthermore, our findings suggest that the application rate of such amendments, rather than the C/N ratios and amendment origin (from sludge or woody plants), is the key factor for promoting Corg accumulation in the silt-sized fractions of semiarid degraded soils.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Semiarid soil, sewage sludge, soil basal respiration, soil carbon accumulation, soil particle-size fractionation, vine pruning wastes
in
Arid Land Research and Management
volume
31
issue
1
pages
15 pages
publisher
Taylor & Francis
external identifiers
  • scopus:84978159887
  • wos:000392424500002
ISSN
1532-4982
DOI
10.1080/15324982.2016.1195458
language
English
LU publication?
yes
id
a3122e83-c506-42ad-a2a4-b03f1a8f71a9
date added to LUP
2017-01-12 13:12:14
date last changed
2018-01-07 11:44:28
@article{a3122e83-c506-42ad-a2a4-b03f1a8f71a9,
  abstract     = {<p>A 9-month lab experiment was carried out with three different amendments (vine pruning wastes, PW; composted vine pruning wastes, cPW; and sewage sludge, SS) added at three different rates (90, 180, and 240 t ha<sup>−1</sup>, dry weight) in order to test whether the type or the quantity of the amendments applied to a semiarid, degraded soil determined the C<sub>org</sub> accumulation in its particle-size fractions (coarse sand, 200–2,000 µm; fine sand, 63–200 µm; silt, 2–63 µm; and clay, 0.1–2 µm). All amendments, independently of their C/N ratios, resulted in similar C<sub>org</sub> content and accumulation in coarse sand and silt-sized fractions after 9 months. In the clay-sized fraction, enrichment in C<sub>org</sub> produced the incorporation of particles from this particle-size fraction into the silt-sized fraction. Likewise, increasing the application rates of the amendments led to larger C<sub>org</sub> contents into the particle-size fractions of all amended soils except for the clay-sized fraction. The application of SS resulted in lower basal respiration-to-C<sub>org</sub> ratios in the clay-sized fraction than the application of PW and cPW, suggesting a higher protection of the C<sub>org</sub> in the SS treatment. These results indicate that organic amendments from woody plants with C/N ratios higher than 30, such as PW, favor C<sub>org</sub> accumulation in the fine sand-sized fractions. Furthermore, our findings suggest that the application rate of such amendments, rather than the C/N ratios and amendment origin (from sludge or woody plants), is the key factor for promoting C<sub>org</sub> accumulation in the silt-sized fractions of semiarid degraded soils.</p>},
  author       = {Nicolás, César and Hernández, Teresa and García, Carlos},
  issn         = {1532-4982},
  keyword      = {Semiarid soil,sewage sludge,soil basal respiration,soil carbon accumulation,soil particle-size fractionation,vine pruning wastes},
  language     = {eng},
  month        = {01},
  number       = {1},
  pages        = {14--28},
  publisher    = {Taylor & Francis},
  series       = {Arid Land Research and Management},
  title        = {Type and quantity of organic amendments determine the amount of carbon stabilized in particle-size fractions of a semiarid degraded soil},
  url          = {http://dx.doi.org/10.1080/15324982.2016.1195458},
  volume       = {31},
  year         = {2017},
}