Data/hora: 12/06/2024 09:51:12

Biblioteca(s): | Embrapa Amazônia Oriental.
Data corrente: | 04/09/2017
Data da última atualização: | 22/12/2021
Autoria: | STAHL, C.; FONTAINE, S.; KLUMPP, K.; PICON-COCHARD, C.; GRISE, M. M.; DEZÉCACHE, C.; PONCHANT, l.; FREYCON, V.; BLANC, L.; BONAL, D.; BURBAN, B.; SOUSSANA, J.-F.; BLANFORT, V.
Afiliação: | CLÉMENT STAHL, CIRAD / University of Antwer / INRA; SÉBASTIEN FONTAINE, INRA; KATJA KLUMPP, INRA; CATHERINE PICON-COCHARD, INRA; MARCIA MASCARENHAS GRISE, CPATU; CAMILLE DEZÉCACHE, CIRAD; LISE PONCHANT, CIRAD; VINCENT FREYCON, CIRAD; LILIAN BLANC, CIRAD; DAMIEN BONAL, INRA; BENOIT BURBAN, INRA; JEAN-FRANÇOIS SOUSSANA, INRA; VINCENT BLANFORT, CIRAD.
Título: | Continuous soil carbon storage of old permanent pastures in Amazonia.
Ano de publicação: | 2017
Fonte/Imprenta: | Global Change Biology, v. 23, n. 8, p. 3382-3392, Aug. 2017.
DOI: | 10.1111/gcb.13573
Idioma: | Inglês
Conteúdo: | Amazonian forests continuously accumulate carbon (C) in biomass and in soil, representing a carbon sink of 0.42?0.65 GtC yr&#8722;1. In recent decades, more than 15% of Amazonian forests have been converted into pastures, resulting in net C emissions (~200 tC ha&#8722;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 (&#8805;24 year) tropical pastures managed with a low stocking rate (±1 LSU ha&#8722;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 &#8722;1.27 ± 0.37 and &#8722;5.31 ± 2.08 tC ha&#8722;1 yr&#8722;1 while the nearby native forest stored &#8722;3.31 ± 0.44 tC ha&#8722;1 yr&#8722;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.
Palavras-Chave: | Armazenamento de carbono; Solo profundo.
Thesagro: | Floresta Nativa; Pastagem; Pastagem Mista.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Amazônia Oriental (CPATU)
Exemplares: | CPATU - (54079-1) - UPC - AP - DD -  -  -  - DIS