Continuous soil carbon storage of old permanent pastures in Amazonia

Autor: Catherine Picon-Cochard, Benoit Burban, Vincent Blanfort, Katja Klumpp, Lilian Blanc, Marcia Mascarenhas Grise, Lise Ponchant, Jean-François Soussana, Clément Stahl, Camille Dezécache, Damien Bonal, Vincent Freycon, Sébastien Fontaine
Přispěvatelé: Ecologie des forêts de Guyane (UMR ECOFOG), Université des Antilles (UA)-Université de Guyane (UG)-Centre National de la Recherche Scientifique (CNRS)-AgroParisTech-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA), Systèmes d'élevage méditerranéens et tropicaux (UMR SELMET), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Unité Mixte de Recherche sur l'Ecosystème Prairial - UMR (UREP), Institut National de la Recherche Agronomique (INRA)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS), EMBRAPA Amazonia Oriental, Brazilian Agricultural Research Corporation (Embrapa), Agrosystèmes tropicaux (ASTRO), Institut National de la Recherche Agronomique (INRA), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Ecologie et Ecophysiologie Forestières [devient SILVA en 2018] (EEF), Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL), European project animal change : FP7 KKBE 2010-4, European Research Council Synergy : ERC-2013-SyG-610028 8 IMBALANCE-P, ANR-10-LABX-0025,CEBA,CEnter of the study of Biodiversity in Amazonia(2010)
Jazyk: angličtina
Rok vydání: 2017
Předmět:
émission atmosphérique
Litière forestière
CN coupling
010504 meteorology & atmospheric sciences
[SDV]Life Sciences [q-bio]
forêt tropicale
Carbon sequestration
Forests
01 natural sciences
Deep soil
Trees
[SHS]Humanities and Social Sciences
Soil
K01 - Foresterie - Considérations générales
Biomass
General Environmental Science
2. Zero hunger
Global and Planetary Change
Utilisation des terres
Ecology
Agroforestry
Pâturages
Carbon sink
04 agricultural and veterinary sciences
Mixed-grass pasture
Humus
Chemistry
séquestration du carbone
Forêt
mixed-grass pasture
[SDE]Environmental Sciences
Soil horizon
Écosystème forestier
deep soil
native forest
P01 - Conservation de la nature et ressources foncières
Brazil
Native forest
P33 - Chimie et physique du sol
Carbon Sequestration
P40 - Météorologie et climatologie
Chronosequence
cn coupling
Matière organique du sol
Environmental Chemistry
[SDV.BV]Life Sciences [q-bio]/Vegetal Biology
Ecosystem
[INFO]Computer Science [cs]
K70 - Dégâts causés aux forêts et leur protection
Plante fourragère
Biology
0105 earth and related environmental sciences
Soil organic matter
L01 - Élevage - Considérations générales
Soil carbon
15. Life on land
carbon storage
Déboisement
Carbon
Carbon storage
Agronomy
040103 agronomy & agriculture
0401 agriculture
forestry
and fisheries
Environmental science
Cycle du carbone
Zdroj: Global Change Biology
Global Change Biology, Wiley, 2017, 23 (8), pp.3382-3392. ⟨10.1111/gcb.13573⟩
Global change biology
ISSN: 1354-1013
1365-2486
Popis: Amazonian forests continuously accumulate carbon (C) in biomass and in soil, representing a carbon sink of 0.420.65 GtC yr(-1). In recent decades, more than 15% of Amazonian forests have been converted into pastures, resulting in net C emissions (similar to 200 tC ha(-1)) due to biomass burning and litter mineralization in the first years after deforestation. However, little is known about the capacity of tropical pastures to restore a C sink. Our study shows in French Amazonia that the C storage observed in native forest can be partly restored in old (>= 24 year) tropical pastures managed with a low stocking rate (+/- 1 LSU ha(-1)) and without the use of fire since their establishment. A unique combination of a large chronosequence study and eddy covariance measurements showed that pastures stored between >= 1.27 +/- 0.37 and -5.31 +/- 2.08 tC ha(-1) yr(-1) while the nearby native forest stored -3.31 +/- 0.44 tC ha(-1) yr(-1). This carbon is mainly sequestered in the humus of deep soil layers (20-100 cm), whereas no C storage was observed in the 0- to 20-cm layer. C storage in C4 tropical pasture is associated with the installation and development of C3 species, which increase either the input of N to the ecosystem or the C: N ratio of soil organic matter. Efforts to curb deforestation remain an obvious priority to preserve forest C stocks and biodiversity. However, our results show that if sustainable management is applied in tropical pastures coming from deforestation (avoiding fires and overgrazing, using a grazing rotation plan and a mixture of C3 and C4 species), they can ensure a continuous C storage, thereby adding to the current C sink of Amazonian forests.
Databáze: OpenAIRE
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