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Vertical distribution of root biomass and soil carbon stocks in forage cropping systems

Abstract
Background and aims: Forage cropping systems may differentially affect the vertical distribution of roots and soil organic C stock (C-OM). In annual crops sequences (ACS) and perennial pastures (PP), we assessed the association between root biomass, C-OM, C in mineral-associated organic matter (C-MAOM), and C in particulate organic matter (C-POM) and its vertical distribution. Methods: Root biomass, C-OM, C-MAOM and C-POM were measured in a [ver mas...]
Background and aims: Forage cropping systems may differentially affect the vertical distribution of roots and soil organic C stock (C-OM). In annual crops sequences (ACS) and perennial pastures (PP), we assessed the association between root biomass, C-OM, C in mineral-associated organic matter (C-MAOM), and C in particulate organic matter (C-POM) and its vertical distribution. Methods: Root biomass, C-OM, C-MAOM and C-POM were measured in a Petrocalcic Argiudol at five soil depths up to 100 cm during two years in the south-eastern Pampas of Argentina. The field experiment comprised 28 plots including five perennial pastures and two annual crop sequences. Associations between variables were assessed by regression analysis and non-linear models. Results: Overall, ACS and PP had similar cumulative root biomass. Both, root biomass and soil C stocks exponentially decreased with soil depth. Soil C stocks associated to root biomass tended to stabilize over a threshold value of root biomass for C-MAOM and C-OM. C-POM tended to stabilize over a threshold value only in treatments that included tall fescue. Conclusions: Our results highlights the key role of roots to improve soil C stocks through the design of forage crop rotations that include crops able to increase root inputs to the soil, such as tall fescue. [Cerrar]
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Author
Ojeda, Jonathan Jesus;   Caviglia, Octavio;   Agnusdei, Monica Graciela;  
Fuente
Plant and soil 423 (1–2) : 175–191. (February 2018)
Date
2018-02
Editorial
Springer
ISSN
0032-079X
1573-5036 (Online)
URI
http://hdl.handle.net/20.500.12123/2864
https://link.springer.com/article/10.1007%2Fs11104-017-3502-8
DOI
https://doi.org/10.1007/s11104-017-3502-8
Formato
pdf
Tipo de documento
artículo
Palabras Claves
Biomasa; Carbono; Materia Orgánica del Suelo; Raíces; Plantas Forrajeras; Sistemas de Cultivo; Cropping Systems; Feed Crops; Roots; Soil Organic Matter; Carbon; Biomass; Región Pampena;
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Excepto donde se diga explicitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
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