Long-term effects of contrasting tillage on soil organic carbon, nitrous oxide and ammonia emissions in a Mediterranean Vertisol under different crop sequences

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Abstract

This 2-year study aimed to verify whether the continuous application of no tillage (NT) for over 20 years, in comparison with conventional tillage (CT), affects nitrous oxide (N2O) and ammonia (NH3) emissions from a Vertisol and, if so, whether such an effect varies with crop sequence (continuous wheat, WW and wheat after faba bean, FW). To shed light on the mechanisms involved in determining N-gas emissions, soil bulk density, water filled pore space (WFPS), some carbon (C) and nitrogen (N) pools, denitrifying enzyme activity (DEA), and nitrous oxide reductase gene abundance (nosZ gene) were also assessed at 0-15 and 15-30 cm soil depth. Tillage system had no significant effect on total NH3 emissions. On average, total N2O emissions were higher under NT (2.45 kg N2O-N ha-1) than CT (1.72 kg N2O-N h-1), being the differences between the two tillage systems greater in FW than WW. The higher N2O emissions in NT treatments were ascribed to the increased bulk density, WFPS, and extractable organic C under NT compared to CT, all factors that generally promote the production of N2O. Moreover, compared to CT, NT enhanced the potential DEA (114 vs 16 µg N kg-1 ha-1) and nosZ gene abundance (116 vs 69 copy number mg-1 dry soil) in the topsoil. Finally, NT compared to CT led to an average annual increase in C stock of 0.70 Mg C ha-1 year-1. Though NT can increase the amount os soil organic matter so storing CO2into soil, some criticisms related to the increase of N2O emission arise, thereby suggesting the need for defining management strategies to mitigate such a negative effect.
Original languageEnglish
Pages (from-to)18-27
Number of pages10
JournalScience of the Total Environment
Volume619-620
Publication statusPublished - 2018

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Vertisol
Nitrous Oxide
zero tillage
Organic carbon
nitrous oxide
Ammonia
tillage
Crops
ammonia
organic carbon
Soils
crop
Oxides
Genes
Enzyme activity
soil
pore space
bulk density
enzyme activity
gene

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

Cite this

@article{8b65d0e3405d4180b8021265ebd53344,
title = "Long-term effects of contrasting tillage on soil organic carbon, nitrous oxide and ammonia emissions in a Mediterranean Vertisol under different crop sequences",
abstract = "This 2-year study aimed to verify whether the continuous application of no tillage (NT) for over 20 years, in comparison with conventional tillage (CT), affects nitrous oxide (N2O) and ammonia (NH3) emissions from a Vertisol and, if so, whether such an effect varies with crop sequence (continuous wheat, WW and wheat after faba bean, FW). To shed light on the mechanisms involved in determining N-gas emissions, soil bulk density, water filled pore space (WFPS), some carbon (C) and nitrogen (N) pools, denitrifying enzyme activity (DEA), and nitrous oxide reductase gene abundance (nosZ gene) were also assessed at 0-15 and 15-30 cm soil depth. Tillage system had no significant effect on total NH3 emissions. On average, total N2O emissions were higher under NT (2.45 kg N2O-N ha-1) than CT (1.72 kg N2O-N h-1), being the differences between the two tillage systems greater in FW than WW. The higher N2O emissions in NT treatments were ascribed to the increased bulk density, WFPS, and extractable organic C under NT compared to CT, all factors that generally promote the production of N2O. Moreover, compared to CT, NT enhanced the potential DEA (114 vs 16 µg N kg-1 ha-1) and nosZ gene abundance (116 vs 69 copy number mg-1 dry soil) in the topsoil. Finally, NT compared to CT led to an average annual increase in C stock of 0.70 Mg C ha-1 year-1. Though NT can increase the amount os soil organic matter so storing CO2into soil, some criticisms related to the increase of N2O emission arise, thereby suggesting the need for defining management strategies to mitigate such a negative effect.",
keywords = "Carbon stock, Environmental Chemistry, Greenhouse gas emissions, Mediterranean environment, No tillage, Pollution, Wheat, nosZ gene",
author = "Giuseppe Badagliacca and Luigi Badalucco and Paolo Ruisi and Laudicina, {Vito Armando} and Gaetano Amato and Dario Giambalvo and Giuseppe Badagliacca and Emilio Ben{\'i}tez",
year = "2018",
language = "English",
volume = "619-620",
pages = "18--27",
journal = "Science of the Total Environment",
issn = "0048-9697",
publisher = "Elsevier",

}

TY - JOUR

T1 - Long-term effects of contrasting tillage on soil organic carbon, nitrous oxide and ammonia emissions in a Mediterranean Vertisol under different crop sequences

AU - Badagliacca, Giuseppe

AU - Badalucco, Luigi

AU - Ruisi, Paolo

AU - Laudicina, Vito Armando

AU - Amato, Gaetano

AU - Giambalvo, Dario

AU - Badagliacca, Giuseppe

AU - Benítez, Emilio

PY - 2018

Y1 - 2018

N2 - This 2-year study aimed to verify whether the continuous application of no tillage (NT) for over 20 years, in comparison with conventional tillage (CT), affects nitrous oxide (N2O) and ammonia (NH3) emissions from a Vertisol and, if so, whether such an effect varies with crop sequence (continuous wheat, WW and wheat after faba bean, FW). To shed light on the mechanisms involved in determining N-gas emissions, soil bulk density, water filled pore space (WFPS), some carbon (C) and nitrogen (N) pools, denitrifying enzyme activity (DEA), and nitrous oxide reductase gene abundance (nosZ gene) were also assessed at 0-15 and 15-30 cm soil depth. Tillage system had no significant effect on total NH3 emissions. On average, total N2O emissions were higher under NT (2.45 kg N2O-N ha-1) than CT (1.72 kg N2O-N h-1), being the differences between the two tillage systems greater in FW than WW. The higher N2O emissions in NT treatments were ascribed to the increased bulk density, WFPS, and extractable organic C under NT compared to CT, all factors that generally promote the production of N2O. Moreover, compared to CT, NT enhanced the potential DEA (114 vs 16 µg N kg-1 ha-1) and nosZ gene abundance (116 vs 69 copy number mg-1 dry soil) in the topsoil. Finally, NT compared to CT led to an average annual increase in C stock of 0.70 Mg C ha-1 year-1. Though NT can increase the amount os soil organic matter so storing CO2into soil, some criticisms related to the increase of N2O emission arise, thereby suggesting the need for defining management strategies to mitigate such a negative effect.

AB - This 2-year study aimed to verify whether the continuous application of no tillage (NT) for over 20 years, in comparison with conventional tillage (CT), affects nitrous oxide (N2O) and ammonia (NH3) emissions from a Vertisol and, if so, whether such an effect varies with crop sequence (continuous wheat, WW and wheat after faba bean, FW). To shed light on the mechanisms involved in determining N-gas emissions, soil bulk density, water filled pore space (WFPS), some carbon (C) and nitrogen (N) pools, denitrifying enzyme activity (DEA), and nitrous oxide reductase gene abundance (nosZ gene) were also assessed at 0-15 and 15-30 cm soil depth. Tillage system had no significant effect on total NH3 emissions. On average, total N2O emissions were higher under NT (2.45 kg N2O-N ha-1) than CT (1.72 kg N2O-N h-1), being the differences between the two tillage systems greater in FW than WW. The higher N2O emissions in NT treatments were ascribed to the increased bulk density, WFPS, and extractable organic C under NT compared to CT, all factors that generally promote the production of N2O. Moreover, compared to CT, NT enhanced the potential DEA (114 vs 16 µg N kg-1 ha-1) and nosZ gene abundance (116 vs 69 copy number mg-1 dry soil) in the topsoil. Finally, NT compared to CT led to an average annual increase in C stock of 0.70 Mg C ha-1 year-1. Though NT can increase the amount os soil organic matter so storing CO2into soil, some criticisms related to the increase of N2O emission arise, thereby suggesting the need for defining management strategies to mitigate such a negative effect.

KW - Carbon stock

KW - Environmental Chemistry

KW - Greenhouse gas emissions

KW - Mediterranean environment

KW - No tillage

KW - Pollution

KW - Wheat

KW - nosZ gene

UR - http://hdl.handle.net/10447/278867

UR - http://www.elsevier.com/locate/scitotenv

M3 - Article

VL - 619-620

SP - 18

EP - 27

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

ER -