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Vertical distribution of root biomass and soil carbon stocks in forage cropping systems
Ojeda, JJ and Caviglia, OP and Agnusdei, MG, Vertical distribution of root biomass and soil carbon stocks in forage cropping systems, Plant and Soil, 423, (1-2) pp. 175-191. ISSN 0032-079X (2018) [Refereed Article]
Copyright 2017 Springer International Publishing AG, part of Springer Nature
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.
|Item Type:||Refereed Article|
|Keywords:||forage crop intensification, root inputs, organic matter, particulate organic matter, south-eastern pampas of Argentina|
|Research Division:||Agricultural, Veterinary and Food Sciences|
|Research Group:||Agriculture, land and farm management|
|Research Field:||Agricultural land management|
|Objective Division:||Plant Production and Plant Primary Products|
|Objective Group:||Industrial crops|
|Objective Field:||Industrial crops not elsewhere classified|
|UTAS Author:||Ojeda, JJ (Dr Jonathan Ojeda)|
|Year Published:||2018 (online first 2017)|
|Web of Science® Times Cited:||27|
|Deposited By:||Agriculture and Food Systems|
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