Data/hora: 08/06/2024 05:36:33

Biblioteca(s): 	Embrapa Milho e Sorgo.	
Data corrente: 	30/03/2022	
Data da última atualização: 	10/11/2022	
Autoria: 	MOREIRA, E. D. S.; OLIVEIRA, A. F. de; SANTOS, C. A. dos; GONÇALVES, L. C.; VIANA, M. C. M.; MARRIEL, I. E.; GONTIJO NETO, M. M.; ALVARENGA, R. C.; LANA, A. M. Q.	
Afiliação: 	ELWIRA DAPHINN SILVA MOREIRA, Universidade Federal de Minas Gerais; ALAN FIGUEIREDO DE OLIVEIRA, Universidade Federal de Minas Gerais; CLAUDINEI ALVES DOS SANTOS, Universidade Federal de Minas Gerais; LÚCIO CARLOS GONÇALVES, Universidade Federal de Minas Gerais; MARIA CELUTA MACHADO VIANA, Epamig; IVANILDO EVODIO MARRIEL, CNPMS; MIGUEL MARQUES GONTIJO NETO, CNPMS; RAMON COSTA ALVARENGA, CNPMS; ÂNGELA MARIA QUINTÃO LANA, Universidade Federal de Minas Gerais.	
Título: 	Soil carbon stock and biological activity in silvopastoral systems planted with Eucalyptus grandis in a tropical climate.	
Ano de publicação: 	2022	
Fonte/Imprenta: 	Soil Research, v. 60, n. 7, p. 705-718, 2022.	
DOI: 	https://doi.org/10.1071/SR21223	
Idioma: 	Inglês	
Conteúdo: 	Context: There is little information on the effects of tree densities and ages of silvopastoral systems (SSPs) on total soil carbon stock (TSCS). Aims: This study aimed to evaluate the TSCS, carbon and nitrogen fractionation and biological activity in SSPs planted with Eucalyptus grandis in different densities and ages. Methods: Two SSPs (333 or 166 trees ha?1) and one full sun pasture (FSP) grown for 5 or 7 years and native vegetation (NV) were evaluated (seven treatments). Samples were collected up to 1 m deep to evaluate the variables. Key results: Particulate organic carbon (POC) and particulate organic nitrogen (PON) were higher (P < 0.05) in FSP (14.1 and 0.725 g kg?1), intermediate in SSP (9.88 and 0.46 g kg?1) and lower in NV (6.12 and 0.29 g kg?1). TSCS was 44.8% (194 vs 134 Mg ha?1; P < 0.001) higher in SSP and FSP compared to NV. Higher tree density reduced TSCS in younger systems, but without effect on older systems. TSCS was 13.7% (207 vs 182 Mg ha?1; P = 0.026), POC was 52.0% (11.9 vs 7.83 g kg?1; P < 0.001) and PON was 54.4% (0.556 vs 0.360 g kg?1; P < 0.001) higher in SSP for 7 compared to 5 years, respectively. Conclusions: Tree density had a limited effect on TSCS. Higher SSP age increased carbon sequestration, probably due to greater cycling in the particulate fraction and better biological activity. Implications: The SSP and well-managed FSP are good strategies to increase TSCS compared to NV, and their use can improve environmental indicators.	
Palavras-Chave: 	Agrofloresta; Ciclagem de nutriente; Integração pecuária-floresta; Manejo de carbono; Manejo de nitrogênio; Sequestro de carbono; Sistema integrado.	
Thesagro: 	Efeito Estufa; Produção Integrada; Sistema de Produção.	
Categoria do assunto: 	A Sistemas de Cultivo	
Registro original: 	Embrapa Milho e Sorgo (CNPMS)	
Exemplares: 	CNPMS - (29797-1) - UPC - AP - DD -  -  -  - DIS