Soil carbon dynamics following afforestation of a tropical savannah with Eucalyptus in Congo
Soil organic matter is a key factor in the global carbon cycle, but the magnitude and the direction of the change in soil carbon after afforestation with Eucalyptus in the tropics is still a matter of controversy. The objective of this work was to understand the dynamics of soil carbon in intensively managed Eucalyptus plantations after the afforestation of a native savannah. The isotopic composition (?) of soil carbon (C) and soil CO2 efflux (F) were measured on a four-age chronosequence of Eucalyptus and on an adjacent savannah. ?F was used to partition F between a C3 component and a C4 component, the latter corresponding to the decomposition of a labile pool of savannah-derived soil carbon (CSL). The mean residence time of CSL was 4.6 years. This further allowed us to partition the savannah-derived soil carbon into a labile and a stable (CSS) carbon pool. CSL accounted for 30% of soil carbon in the top soil of the savannah (0-5 cm), and only 12% when the entire 0-45 cm soil layer was considered. The decrease in CSL with time after plantation was more than compensated by an increase in Eucalyptus-derived carbon, and half of the newly incorporated Eucalyptus-derived carbon in the top soil was associated with the clay and fine silt fractions in the 14-year-old. stand. Increment in soil carbon after afforestation of tropical savannah with Eucalyptus is therefore expected despite a rapid disappearance of the labile savannah-derived carbon because a large fraction of savannah-derived carbon is stable.
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Language: | eng |
Subjects: | P33 - Chimie et physique du sol, K10 - Production forestière, Eucalyptus, sol tropical, plantations, zone tropicale, matière organique du sol, carbone, savane, plantation forestière, extension forestière, http://aims.fao.org/aos/agrovoc/c_2683, http://aims.fao.org/aos/agrovoc/c_7978, http://aims.fao.org/aos/agrovoc/c_5990, http://aims.fao.org/aos/agrovoc/c_7979, http://aims.fao.org/aos/agrovoc/c_35657, http://aims.fao.org/aos/agrovoc/c_1301, http://aims.fao.org/aos/agrovoc/c_6825, http://aims.fao.org/aos/agrovoc/c_3048, http://aims.fao.org/aos/agrovoc/c_162, http://aims.fao.org/aos/agrovoc/c_1811, |
Online Access: | http://agritrop.cirad.fr/552329/ http://agritrop.cirad.fr/552329/1/document_552329.pdf |
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dig-cirad-fr-5523292024-01-28T17:48:49Z http://agritrop.cirad.fr/552329/ http://agritrop.cirad.fr/552329/ Soil carbon dynamics following afforestation of a tropical savannah with Eucalyptus in Congo. Epron Daniel, Marsden Claire, Thongo M'Bou Armel, Saint André Laurent, D'Annunzio Rémi, Nouvellon Yann. 2009. Plant and Soil, 323 (1-2) : 309-322.https://doi.org/10.1007/s11104-009-9939-7 <https://doi.org/10.1007/s11104-009-9939-7> Soil carbon dynamics following afforestation of a tropical savannah with Eucalyptus in Congo Epron, Daniel Marsden, Claire Thongo M'Bou, Armel Saint André, Laurent D'Annunzio, Rémi Nouvellon, Yann eng 2009 Plant and Soil P33 - Chimie et physique du sol K10 - Production forestière Eucalyptus sol tropical plantations zone tropicale matière organique du sol carbone savane plantation forestière extension forestière http://aims.fao.org/aos/agrovoc/c_2683 http://aims.fao.org/aos/agrovoc/c_7978 http://aims.fao.org/aos/agrovoc/c_5990 http://aims.fao.org/aos/agrovoc/c_7979 http://aims.fao.org/aos/agrovoc/c_35657 http://aims.fao.org/aos/agrovoc/c_1301 http://aims.fao.org/aos/agrovoc/c_6825 http://aims.fao.org/aos/agrovoc/c_3048 http://aims.fao.org/aos/agrovoc/c_162 Congo http://aims.fao.org/aos/agrovoc/c_1811 Soil organic matter is a key factor in the global carbon cycle, but the magnitude and the direction of the change in soil carbon after afforestation with Eucalyptus in the tropics is still a matter of controversy. The objective of this work was to understand the dynamics of soil carbon in intensively managed Eucalyptus plantations after the afforestation of a native savannah. The isotopic composition (?) of soil carbon (C) and soil CO2 efflux (F) were measured on a four-age chronosequence of Eucalyptus and on an adjacent savannah. ?F was used to partition F between a C3 component and a C4 component, the latter corresponding to the decomposition of a labile pool of savannah-derived soil carbon (CSL). The mean residence time of CSL was 4.6 years. This further allowed us to partition the savannah-derived soil carbon into a labile and a stable (CSS) carbon pool. CSL accounted for 30% of soil carbon in the top soil of the savannah (0-5 cm), and only 12% when the entire 0-45 cm soil layer was considered. The decrease in CSL with time after plantation was more than compensated by an increase in Eucalyptus-derived carbon, and half of the newly incorporated Eucalyptus-derived carbon in the top soil was associated with the clay and fine silt fractions in the 14-year-old. stand. Increment in soil carbon after afforestation of tropical savannah with Eucalyptus is therefore expected despite a rapid disappearance of the labile savannah-derived carbon because a large fraction of savannah-derived carbon is stable. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/552329/1/document_552329.pdf application/pdf Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1007/s11104-009-9939-7 10.1007/s11104-009-9939-7 http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=189294 info:eu-repo/semantics/altIdentifier/doi/10.1007/s11104-009-9939-7 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1007/s11104-009-9939-7 |
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P33 - Chimie et physique du sol K10 - Production forestière Eucalyptus sol tropical plantations zone tropicale matière organique du sol carbone savane plantation forestière extension forestière http://aims.fao.org/aos/agrovoc/c_2683 http://aims.fao.org/aos/agrovoc/c_7978 http://aims.fao.org/aos/agrovoc/c_5990 http://aims.fao.org/aos/agrovoc/c_7979 http://aims.fao.org/aos/agrovoc/c_35657 http://aims.fao.org/aos/agrovoc/c_1301 http://aims.fao.org/aos/agrovoc/c_6825 http://aims.fao.org/aos/agrovoc/c_3048 http://aims.fao.org/aos/agrovoc/c_162 http://aims.fao.org/aos/agrovoc/c_1811 P33 - Chimie et physique du sol K10 - Production forestière Eucalyptus sol tropical plantations zone tropicale matière organique du sol carbone savane plantation forestière extension forestière http://aims.fao.org/aos/agrovoc/c_2683 http://aims.fao.org/aos/agrovoc/c_7978 http://aims.fao.org/aos/agrovoc/c_5990 http://aims.fao.org/aos/agrovoc/c_7979 http://aims.fao.org/aos/agrovoc/c_35657 http://aims.fao.org/aos/agrovoc/c_1301 http://aims.fao.org/aos/agrovoc/c_6825 http://aims.fao.org/aos/agrovoc/c_3048 http://aims.fao.org/aos/agrovoc/c_162 http://aims.fao.org/aos/agrovoc/c_1811 |
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P33 - Chimie et physique du sol K10 - Production forestière Eucalyptus sol tropical plantations zone tropicale matière organique du sol carbone savane plantation forestière extension forestière http://aims.fao.org/aos/agrovoc/c_2683 http://aims.fao.org/aos/agrovoc/c_7978 http://aims.fao.org/aos/agrovoc/c_5990 http://aims.fao.org/aos/agrovoc/c_7979 http://aims.fao.org/aos/agrovoc/c_35657 http://aims.fao.org/aos/agrovoc/c_1301 http://aims.fao.org/aos/agrovoc/c_6825 http://aims.fao.org/aos/agrovoc/c_3048 http://aims.fao.org/aos/agrovoc/c_162 http://aims.fao.org/aos/agrovoc/c_1811 P33 - Chimie et physique du sol K10 - Production forestière Eucalyptus sol tropical plantations zone tropicale matière organique du sol carbone savane plantation forestière extension forestière http://aims.fao.org/aos/agrovoc/c_2683 http://aims.fao.org/aos/agrovoc/c_7978 http://aims.fao.org/aos/agrovoc/c_5990 http://aims.fao.org/aos/agrovoc/c_7979 http://aims.fao.org/aos/agrovoc/c_35657 http://aims.fao.org/aos/agrovoc/c_1301 http://aims.fao.org/aos/agrovoc/c_6825 http://aims.fao.org/aos/agrovoc/c_3048 http://aims.fao.org/aos/agrovoc/c_162 http://aims.fao.org/aos/agrovoc/c_1811 Epron, Daniel Marsden, Claire Thongo M'Bou, Armel Saint André, Laurent D'Annunzio, Rémi Nouvellon, Yann Soil carbon dynamics following afforestation of a tropical savannah with Eucalyptus in Congo |
description |
Soil organic matter is a key factor in the global carbon cycle, but the magnitude and the direction of the change in soil carbon after afforestation with Eucalyptus in the tropics is still a matter of controversy. The objective of this work was to understand the dynamics of soil carbon in intensively managed Eucalyptus plantations after the afforestation of a native savannah. The isotopic composition (?) of soil carbon (C) and soil CO2 efflux (F) were measured on a four-age chronosequence of Eucalyptus and on an adjacent savannah. ?F was used to partition F between a C3 component and a C4 component, the latter corresponding to the decomposition of a labile pool of savannah-derived soil carbon (CSL). The mean residence time of CSL was 4.6 years. This further allowed us to partition the savannah-derived soil carbon into a labile and a stable (CSS) carbon pool. CSL accounted for 30% of soil carbon in the top soil of the savannah (0-5 cm), and only 12% when the entire 0-45 cm soil layer was considered. The decrease in CSL with time after plantation was more than compensated by an increase in Eucalyptus-derived carbon, and half of the newly incorporated Eucalyptus-derived carbon in the top soil was associated with the clay and fine silt fractions in the 14-year-old. stand. Increment in soil carbon after afforestation of tropical savannah with Eucalyptus is therefore expected despite a rapid disappearance of the labile savannah-derived carbon because a large fraction of savannah-derived carbon is stable. |
format |
article |
topic_facet |
P33 - Chimie et physique du sol K10 - Production forestière Eucalyptus sol tropical plantations zone tropicale matière organique du sol carbone savane plantation forestière extension forestière http://aims.fao.org/aos/agrovoc/c_2683 http://aims.fao.org/aos/agrovoc/c_7978 http://aims.fao.org/aos/agrovoc/c_5990 http://aims.fao.org/aos/agrovoc/c_7979 http://aims.fao.org/aos/agrovoc/c_35657 http://aims.fao.org/aos/agrovoc/c_1301 http://aims.fao.org/aos/agrovoc/c_6825 http://aims.fao.org/aos/agrovoc/c_3048 http://aims.fao.org/aos/agrovoc/c_162 http://aims.fao.org/aos/agrovoc/c_1811 |
author |
Epron, Daniel Marsden, Claire Thongo M'Bou, Armel Saint André, Laurent D'Annunzio, Rémi Nouvellon, Yann |
author_facet |
Epron, Daniel Marsden, Claire Thongo M'Bou, Armel Saint André, Laurent D'Annunzio, Rémi Nouvellon, Yann |
author_sort |
Epron, Daniel |
title |
Soil carbon dynamics following afforestation of a tropical savannah with Eucalyptus in Congo |
title_short |
Soil carbon dynamics following afforestation of a tropical savannah with Eucalyptus in Congo |
title_full |
Soil carbon dynamics following afforestation of a tropical savannah with Eucalyptus in Congo |
title_fullStr |
Soil carbon dynamics following afforestation of a tropical savannah with Eucalyptus in Congo |
title_full_unstemmed |
Soil carbon dynamics following afforestation of a tropical savannah with Eucalyptus in Congo |
title_sort |
soil carbon dynamics following afforestation of a tropical savannah with eucalyptus in congo |
url |
http://agritrop.cirad.fr/552329/ http://agritrop.cirad.fr/552329/1/document_552329.pdf |
work_keys_str_mv |
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