Filling gaps in models simulating carbon storage in agricultural soils: the role of cereal stubbles

Abstract Carbon (C) input is a prerequisite for the formation of soil organic matter and thus for soil organic C (SOC) sequestration. Here we used the C-TOOL model to simulate SOC changes in a long-term field experiment (1932–2020) at Askov, Denmark, which involved four different levels of nutrients...

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Autores principales:	Arezoo Taghizadeh-Toosi, Bent T. Christensen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/fd7c3b5361b54958ad43034376faa42d
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spelling	oai:doaj.org-article:fd7c3b5361b54958ad43034376faa42d2021-12-02T18:02:31ZFilling gaps in models simulating carbon storage in agricultural soils: the role of cereal stubbles10.1038/s41598-021-97744-z2045-2322https://doaj.org/article/fd7c3b5361b54958ad43034376faa42d2021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-97744-zhttps://doaj.org/toc/2045-2322Abstract Carbon (C) input is a prerequisite for the formation of soil organic matter and thus for soil organic C (SOC) sequestration. Here we used the C-TOOL model to simulate SOC changes in a long-term field experiment (1932–2020) at Askov, Denmark, which involved four different levels of nutrients added in mineral fertilizer (0, 0.5, 1, 1.5 NPK) and a four-crop rotation. The C input into soils consists of belowground and aboveground plant biomass and was estimated using allometric functions. The simulation showed that modelled SOC based on standard allometric functions of C input from crop residues did not adequately matched measured SOC contents. However, applying modified allometric functions based on current and the previously measured results for aboveground and belowground C inputs in winter wheat and grass clover in rotations provided much better match between simulated and measured SOC contents for fertilized treatments at normal and high level of fertilization. This improved indicators of C-TOOL model performance (e.g. yielding RMSE of 2.24 t C ha−1 and model efficiency of 0.73 in 1.5 NPK treatment). The results highlight that standard allometric functions greatly overestimates the amount of C in winter wheat stubble left after harvest in treatments dressed with NPK compared with modified functions. The results also highlight further needs for improvement of allometric functions used in simulation models for C-accounting in agroecosystems.Arezoo Taghizadeh-ToosiBent T. ChristensenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Arezoo Taghizadeh-Toosi Bent T. Christensen Filling gaps in models simulating carbon storage in agricultural soils: the role of cereal stubbles
description	Abstract Carbon (C) input is a prerequisite for the formation of soil organic matter and thus for soil organic C (SOC) sequestration. Here we used the C-TOOL model to simulate SOC changes in a long-term field experiment (1932–2020) at Askov, Denmark, which involved four different levels of nutrients added in mineral fertilizer (0, 0.5, 1, 1.5 NPK) and a four-crop rotation. The C input into soils consists of belowground and aboveground plant biomass and was estimated using allometric functions. The simulation showed that modelled SOC based on standard allometric functions of C input from crop residues did not adequately matched measured SOC contents. However, applying modified allometric functions based on current and the previously measured results for aboveground and belowground C inputs in winter wheat and grass clover in rotations provided much better match between simulated and measured SOC contents for fertilized treatments at normal and high level of fertilization. This improved indicators of C-TOOL model performance (e.g. yielding RMSE of 2.24 t C ha−1 and model efficiency of 0.73 in 1.5 NPK treatment). The results highlight that standard allometric functions greatly overestimates the amount of C in winter wheat stubble left after harvest in treatments dressed with NPK compared with modified functions. The results also highlight further needs for improvement of allometric functions used in simulation models for C-accounting in agroecosystems.
format	article
author	Arezoo Taghizadeh-Toosi Bent T. Christensen
author_facet	Arezoo Taghizadeh-Toosi Bent T. Christensen
author_sort	Arezoo Taghizadeh-Toosi
title	Filling gaps in models simulating carbon storage in agricultural soils: the role of cereal stubbles
title_short	Filling gaps in models simulating carbon storage in agricultural soils: the role of cereal stubbles
title_full	Filling gaps in models simulating carbon storage in agricultural soils: the role of cereal stubbles
title_fullStr	Filling gaps in models simulating carbon storage in agricultural soils: the role of cereal stubbles
title_full_unstemmed	Filling gaps in models simulating carbon storage in agricultural soils: the role of cereal stubbles
title_sort	filling gaps in models simulating carbon storage in agricultural soils: the role of cereal stubbles
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/fd7c3b5361b54958ad43034376faa42d
work_keys_str_mv	AT arezootaghizadehtoosi fillinggapsinmodelssimulatingcarbonstorageinagriculturalsoilstheroleofcerealstubbles AT benttchristensen fillinggapsinmodelssimulatingcarbonstorageinagriculturalsoilstheroleofcerealstubbles
_version_	1718378906757627904

Filling gaps in models simulating carbon storage in agricultural soils: the role of cereal stubbles

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