Contribution of tree and crop roots to soil carbon stocks in a Sub-Sahelian agroforestry parkland in Senegal
In the Sub-Sahelian region (Senegal), Faidherbia albida trees have been maintained for years in agroforestry parklands for their numerous services offered to people and to crops. The aerial crop biomass and yield are notably greater under the tree crown, but most of this biomass is exported and does not contribute to soil carbon (C) inputs. Belowground litter inputs are crucial, but little is known about the root system distribution, productivity and contribution to soil C inputs. This study aims to assess the field heterogeneity of F. albida and crop root systems along the soil profile based on the distance to the tree to evaluate the root contribution to soil C stocks. During two successive rotations of pearl millet in 2020 and groundnut in 2021, soils and roots were sampled from two locations (Under and Far from the tree), in 5 soil layers to a depth of 150 cm and with three tree replicates. The aerial biomass was also sampled. The annual relative contribution of roots to soil C stocks was estimated as the ratio between root litter-derived C inputs (considering hypothetical root turnover only for trees and the whole root biomass for crops) and soil C stocks. We found a similar crop root biomass density Under and Far from the tree, but the higher root:shoot ratio Far from than Under the tree confirmed the beneficial effect of trees on the aerial crop biomass. Unexpectedly, the tree root biomass density was higher at + 30 m from the trunk than Under the tree in the 30–100 cm soil layer, suggesting a long-distance soil exploration by the trees. Down to 150 cm of depth, the tree root litter contribution to soil C stocks represented 6.1 % and 7.1 % of the total root litter-derived C inputs (Under and Far from the tree, respectively). In this type of Sub-Sahelian parklands with low soil C stocks, increasing the tree density or selecting deep and highly rooted crop varieties should be favoured.
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dig-cirad-fr-608198 |
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Biblioteca del CIRAD Francia |
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P33 - Chimie et physique du sol P34 - Biologie du sol F08 - Systèmes et modes de culture système racinaire agroforesterie biomasse racine Faidherbia albida enracinement rhizosphère plante racine compétition interspécifique rendement des cultures propriété physicochimique du sol profondeur http://aims.fao.org/aos/agrovoc/c_16034 http://aims.fao.org/aos/agrovoc/c_207 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_6651 http://aims.fao.org/aos/agrovoc/c_10734 http://aims.fao.org/aos/agrovoc/c_6649 http://aims.fao.org/aos/agrovoc/c_6569 http://aims.fao.org/aos/agrovoc/c_6641 http://aims.fao.org/aos/agrovoc/c_32648 http://aims.fao.org/aos/agrovoc/c_10176 http://aims.fao.org/aos/agrovoc/c_7182 http://aims.fao.org/aos/agrovoc/c_2190 http://aims.fao.org/aos/agrovoc/c_6970 P33 - Chimie et physique du sol P34 - Biologie du sol F08 - Systèmes et modes de culture système racinaire agroforesterie biomasse racine Faidherbia albida enracinement rhizosphère plante racine compétition interspécifique rendement des cultures propriété physicochimique du sol profondeur http://aims.fao.org/aos/agrovoc/c_16034 http://aims.fao.org/aos/agrovoc/c_207 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_6651 http://aims.fao.org/aos/agrovoc/c_10734 http://aims.fao.org/aos/agrovoc/c_6649 http://aims.fao.org/aos/agrovoc/c_6569 http://aims.fao.org/aos/agrovoc/c_6641 http://aims.fao.org/aos/agrovoc/c_32648 http://aims.fao.org/aos/agrovoc/c_10176 http://aims.fao.org/aos/agrovoc/c_7182 http://aims.fao.org/aos/agrovoc/c_2190 http://aims.fao.org/aos/agrovoc/c_6970 |
spellingShingle |
P33 - Chimie et physique du sol P34 - Biologie du sol F08 - Systèmes et modes de culture système racinaire agroforesterie biomasse racine Faidherbia albida enracinement rhizosphère plante racine compétition interspécifique rendement des cultures propriété physicochimique du sol profondeur http://aims.fao.org/aos/agrovoc/c_16034 http://aims.fao.org/aos/agrovoc/c_207 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_6651 http://aims.fao.org/aos/agrovoc/c_10734 http://aims.fao.org/aos/agrovoc/c_6649 http://aims.fao.org/aos/agrovoc/c_6569 http://aims.fao.org/aos/agrovoc/c_6641 http://aims.fao.org/aos/agrovoc/c_32648 http://aims.fao.org/aos/agrovoc/c_10176 http://aims.fao.org/aos/agrovoc/c_7182 http://aims.fao.org/aos/agrovoc/c_2190 http://aims.fao.org/aos/agrovoc/c_6970 P33 - Chimie et physique du sol P34 - Biologie du sol F08 - Systèmes et modes de culture système racinaire agroforesterie biomasse racine Faidherbia albida enracinement rhizosphère plante racine compétition interspécifique rendement des cultures propriété physicochimique du sol profondeur http://aims.fao.org/aos/agrovoc/c_16034 http://aims.fao.org/aos/agrovoc/c_207 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_6651 http://aims.fao.org/aos/agrovoc/c_10734 http://aims.fao.org/aos/agrovoc/c_6649 http://aims.fao.org/aos/agrovoc/c_6569 http://aims.fao.org/aos/agrovoc/c_6641 http://aims.fao.org/aos/agrovoc/c_32648 http://aims.fao.org/aos/agrovoc/c_10176 http://aims.fao.org/aos/agrovoc/c_7182 http://aims.fao.org/aos/agrovoc/c_2190 http://aims.fao.org/aos/agrovoc/c_6970 Siegwart, Lorène Bertrand, Isabelle Roupsard, Olivier Jourdan, Christophe Contribution of tree and crop roots to soil carbon stocks in a Sub-Sahelian agroforestry parkland in Senegal |
description |
In the Sub-Sahelian region (Senegal), Faidherbia albida trees have been maintained for years in agroforestry parklands for their numerous services offered to people and to crops. The aerial crop biomass and yield are notably greater under the tree crown, but most of this biomass is exported and does not contribute to soil carbon (C) inputs. Belowground litter inputs are crucial, but little is known about the root system distribution, productivity and contribution to soil C inputs. This study aims to assess the field heterogeneity of F. albida and crop root systems along the soil profile based on the distance to the tree to evaluate the root contribution to soil C stocks. During two successive rotations of pearl millet in 2020 and groundnut in 2021, soils and roots were sampled from two locations (Under and Far from the tree), in 5 soil layers to a depth of 150 cm and with three tree replicates. The aerial biomass was also sampled. The annual relative contribution of roots to soil C stocks was estimated as the ratio between root litter-derived C inputs (considering hypothetical root turnover only for trees and the whole root biomass for crops) and soil C stocks. We found a similar crop root biomass density Under and Far from the tree, but the higher root:shoot ratio Far from than Under the tree confirmed the beneficial effect of trees on the aerial crop biomass. Unexpectedly, the tree root biomass density was higher at + 30 m from the trunk than Under the tree in the 30–100 cm soil layer, suggesting a long-distance soil exploration by the trees. Down to 150 cm of depth, the tree root litter contribution to soil C stocks represented 6.1 % and 7.1 % of the total root litter-derived C inputs (Under and Far from the tree, respectively). In this type of Sub-Sahelian parklands with low soil C stocks, increasing the tree density or selecting deep and highly rooted crop varieties should be favoured. |
format |
article |
topic_facet |
P33 - Chimie et physique du sol P34 - Biologie du sol F08 - Systèmes et modes de culture système racinaire agroforesterie biomasse racine Faidherbia albida enracinement rhizosphère plante racine compétition interspécifique rendement des cultures propriété physicochimique du sol profondeur http://aims.fao.org/aos/agrovoc/c_16034 http://aims.fao.org/aos/agrovoc/c_207 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_6651 http://aims.fao.org/aos/agrovoc/c_10734 http://aims.fao.org/aos/agrovoc/c_6649 http://aims.fao.org/aos/agrovoc/c_6569 http://aims.fao.org/aos/agrovoc/c_6641 http://aims.fao.org/aos/agrovoc/c_32648 http://aims.fao.org/aos/agrovoc/c_10176 http://aims.fao.org/aos/agrovoc/c_7182 http://aims.fao.org/aos/agrovoc/c_2190 http://aims.fao.org/aos/agrovoc/c_6970 |
author |
Siegwart, Lorène Bertrand, Isabelle Roupsard, Olivier Jourdan, Christophe |
author_facet |
Siegwart, Lorène Bertrand, Isabelle Roupsard, Olivier Jourdan, Christophe |
author_sort |
Siegwart, Lorène |
title |
Contribution of tree and crop roots to soil carbon stocks in a Sub-Sahelian agroforestry parkland in Senegal |
title_short |
Contribution of tree and crop roots to soil carbon stocks in a Sub-Sahelian agroforestry parkland in Senegal |
title_full |
Contribution of tree and crop roots to soil carbon stocks in a Sub-Sahelian agroforestry parkland in Senegal |
title_fullStr |
Contribution of tree and crop roots to soil carbon stocks in a Sub-Sahelian agroforestry parkland in Senegal |
title_full_unstemmed |
Contribution of tree and crop roots to soil carbon stocks in a Sub-Sahelian agroforestry parkland in Senegal |
title_sort |
contribution of tree and crop roots to soil carbon stocks in a sub-sahelian agroforestry parkland in senegal |
url |
http://agritrop.cirad.fr/608198/ http://agritrop.cirad.fr/608198/1/Siegwart%202023%20AEE%20Contribution%20of%20tree%20and%20crop%20roots%20to%20soil%20carbon%20stocks%20in%20a%20Sub-Sahelian%20agroforestry%20parkland%20in%20Senegal.pdf |
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_version_ |
1792500757517303808 |
spelling |
dig-cirad-fr-6081982024-02-10T10:16:59Z http://agritrop.cirad.fr/608198/ http://agritrop.cirad.fr/608198/ Contribution of tree and crop roots to soil carbon stocks in a Sub-Sahelian agroforestry parkland in Senegal. Siegwart Lorène, Bertrand Isabelle, Roupsard Olivier, Jourdan Christophe. 2023. Agriculture, Ecosystems and Environment, 352:108524, 11 p.https://doi.org/10.1016/j.agee.2023.108524 <https://doi.org/10.1016/j.agee.2023.108524> Contribution of tree and crop roots to soil carbon stocks in a Sub-Sahelian agroforestry parkland in Senegal Siegwart, Lorène Bertrand, Isabelle Roupsard, Olivier Jourdan, Christophe eng 2023 Agriculture, Ecosystems and Environment P33 - Chimie et physique du sol P34 - Biologie du sol F08 - Systèmes et modes de culture système racinaire agroforesterie biomasse racine Faidherbia albida enracinement rhizosphère plante racine compétition interspécifique rendement des cultures propriété physicochimique du sol profondeur http://aims.fao.org/aos/agrovoc/c_16034 http://aims.fao.org/aos/agrovoc/c_207 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_6651 http://aims.fao.org/aos/agrovoc/c_10734 http://aims.fao.org/aos/agrovoc/c_6649 http://aims.fao.org/aos/agrovoc/c_6569 http://aims.fao.org/aos/agrovoc/c_6641 http://aims.fao.org/aos/agrovoc/c_32648 http://aims.fao.org/aos/agrovoc/c_10176 http://aims.fao.org/aos/agrovoc/c_7182 http://aims.fao.org/aos/agrovoc/c_2190 Sénégal http://aims.fao.org/aos/agrovoc/c_6970 In the Sub-Sahelian region (Senegal), Faidherbia albida trees have been maintained for years in agroforestry parklands for their numerous services offered to people and to crops. The aerial crop biomass and yield are notably greater under the tree crown, but most of this biomass is exported and does not contribute to soil carbon (C) inputs. Belowground litter inputs are crucial, but little is known about the root system distribution, productivity and contribution to soil C inputs. This study aims to assess the field heterogeneity of F. albida and crop root systems along the soil profile based on the distance to the tree to evaluate the root contribution to soil C stocks. During two successive rotations of pearl millet in 2020 and groundnut in 2021, soils and roots were sampled from two locations (Under and Far from the tree), in 5 soil layers to a depth of 150 cm and with three tree replicates. The aerial biomass was also sampled. The annual relative contribution of roots to soil C stocks was estimated as the ratio between root litter-derived C inputs (considering hypothetical root turnover only for trees and the whole root biomass for crops) and soil C stocks. We found a similar crop root biomass density Under and Far from the tree, but the higher root:shoot ratio Far from than Under the tree confirmed the beneficial effect of trees on the aerial crop biomass. Unexpectedly, the tree root biomass density was higher at + 30 m from the trunk than Under the tree in the 30–100 cm soil layer, suggesting a long-distance soil exploration by the trees. Down to 150 cm of depth, the tree root litter contribution to soil C stocks represented 6.1 % and 7.1 % of the total root litter-derived C inputs (Under and Far from the tree, respectively). In this type of Sub-Sahelian parklands with low soil C stocks, increasing the tree density or selecting deep and highly rooted crop varieties should be favoured. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/608198/1/Siegwart%202023%20AEE%20Contribution%20of%20tree%20and%20crop%20roots%20to%20soil%20carbon%20stocks%20in%20a%20Sub-Sahelian%20agroforestry%20parkland%20in%20Senegal.pdf text Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1016/j.agee.2023.108524 10.1016/j.agee.2023.108524 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.agee.2023.108524 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1016/j.agee.2023.108524 info:eu-repo/grantAgreement/EC////(EU) EU-LEAP-Agri RAMSES I/ info:eu-repo/grantAgreement/EC////(FRA) DSCATT/ |