Data/hora: 23/09/2024 23:13:05

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