Cited by 179Soil Carbon and Nitrogen DynamicsSoil erosion and sediment transportSoil Management and Crop Yield

Modeling consequences of straw residues export on soil organic carbon

Saffih-Hdadi, K., Mary, B.·2008·Soil Biology and Biochemistry

Abstract

Cereal straw, which is most often returned to the soil in arable cropping systems, is of renewed interest as a potential source of bioenergy. However, the sustainability of this practice which implies systematic removal of aerial biomass of cereal crops is a controversial issue, particularly in soils having a low soil organic carbon (SOC) content. This study aims at evaluating a simple model (AMG) to predict the consequences of straw export on SOC evolution in various cropping and pedoclimatic conditions. The model was tested on nine long-term field experiments (18-35 yr) dominated by cereal crops and differing in climate, soil type and carbon inputs. The model was able to provide satisfactory simulations of the evolution of SOC in most experiments with a unique set of parameters. The sensitivity analysis indicated that the quality of fit was very sensitive to humification coefficient, moderately sensitive to the size of the stable SOC pool and weakly affected by the ratio of belowground: aerial C input. The dependence of model parameters (humification and mineralization rates) on pedoclimatic conditions (soil clay content and temperature) was analyzed and compared to those proposed in other models (DAISY, CENTURY, ROTHC, CN-SIM) since they vary widely between models. AMG functions provided the best fit in seven out of nine experiments. More generally, the best fit was obtained by assuming that clay content had a small or no effect on humification coefficient and a marked effect on mineralization rate, in accordance with incubation studies in literature. The AMG model was used to simulate the impact of a straw export scenario in nine experiments considering a systematic straw removal one year out of two. With this scenario, straw removal vs. incorporation would reduce carbon stocks by 2.5-10.9% of the initial SOC after 50 yr, depending primarily on the experiment (soil, climate, productivity) and secondarily on the size of the stable C pool (varying from 10% to 65%).

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Registry

Crossref · 10.1016/j.soilbio.2007.08.022

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  • The factors affecting the soil carbon balance are numerous and vary depending on climate, soil conditions and crop management, such as harvest date and residue removal.

    “The factors affecting the soil C balance are numerous and vary depending on climate, soil conditions and crop management, e.g. harvest date and residue removal [62, 128].”

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Authors
Saffih-Hdadi, K., & Mary, B.
Affiliations
Institut National de la Recherche Agronomique (FR)
Corresponding author
Mary, B.
Venue
Soil Biology and Biochemistry
Publisher
Elsevier BV
Published
2008-03
Volume
40
Issue
3
Pages
594-607
ISSN
0038-0717 (ISSN-L)
OpenAlex
W1992680833
Cited by
179
References
64
Citations by year
2026: 5 · 2025: 7 · 2024: 7 · 2023: 8 · 2022: 22 · 2021: 20 · 2020: 16 · 2019: 8 · 2018: 11 · 2017: 11 · 2016: 5 · 2015: 8 · 2014: 10 · 2013: 6 · 2012: 9
FWCI
10.91
Type
journal article
Language
en
Open access
closed
Locations
  • Soil Biology and Biochemistry (publishedVersion)
  • HAL (submittedVersion)
Funders
National Institutes of Natural Sciences
Topics
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil erosion and sediment transport
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Management and Crop Yield
Keywords
soil organic carbon, humification, carbon mineralization, soil carbon stocks, biomass feedstock, straw removal, long-term field experiment, pedoclimatic conditions, soil clay content

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