Data/hora: 03/06/2024 03:22:06

Biblioteca(s): 	Embrapa Trigo.	
Tipo da produção científica: 	Artigo em Periódico Indexado	
Circulação/Nível: 	A - 1	
Data corrente: 	19/07/2022	
Data da última atualização: 	19/07/2022	
Autoria: 	VEECK, G. P.; DALMAGO, G. A.; BREMM, T.; BULIGON, L.; JACQUES, R. J. S.; FERNANDES, J. M. C.; SANTI, A.; VARGAS, P. R.; ROBERTI, D. R.	
Afiliação: 	GUSTAVO PUJOL VEECK, UFSM; GENEI ANTONIO DALMAGO, CNPT; TIAGO BREMM, UFSM; LIDIANE BULIGON, UFSM; RODRIGO JOSEMAR SEMINOTI JACQUES, UFSM; JOSE MAURICIO CUNHA FERNANDES, CNPT; ANDERSON SANTI, CNPT; PAULO ROBERTO VARGAS, Fazenda Capão Grande; DÉBORA REGINA ROBERTI, UFSM.	
Título: 	CO2 flux in a wheat-soybean succession in subtropical Brazil: A carbon sink.	
Ano de publicação: 	2022	
Fonte/Imprenta: 	Journal of Environmental Quality, 1-17, 2022.	
DOI: 	https://doi.org/10.1002/jeq2.20362	
Idioma: 	Inglês	
Conteúdo: 	Abstract: The subtropical region of Brazil is home to 33% of the soybean [Glycine max (L.) Merr.] growing area and 90% of the wheat (Tritucum aestivum L.) growing area of this country. A soybean?wheat succession with fallow between crops is used in about 11% of the cultivated area. No study has quantified CO2 fluxes in annual soybean?wheat succession in this region. Hence, this study analyzed the seasonality of CO2 exchange (net ecosystem exchange [NEE]) in a 2015/2016 wheat?soybean succession in a commercial farm located in Carazinho, Rio Grande do Sul State, Brazil. The eddy covariance method was used to estimate the annual C balance of this system. The NEE was partitioned between gross primary productivity and ecosystem respiration to understand the dynamics of these fluxes during a year of wheat?soybean succession. Considering the net ecosystem balance between photosynthesis and respiration during the growing season, both soybean and wheat absorbed CO2 from the atmosphere (NEE wheat: ?347 ± 4 g C m?2; NEE soybean: ?242 ± 3 g C m?2). The fallow periods between growing seasons, however, acted as a source of 156 ± 2 g C m?2, reducing the C absorbed by the crops by 27%. For 1 yr, the net biome productivity was ?50 g C m?2 yr?1. The results obtained here demonstrate that the wheat?soybean succession was a net C sink under these specific climatic conditions and field management practices and that the long fallow period between crops limited the agroecosystem from becoming a more efficient CO2 sink.	
Palavras-Chave: 	Sucessão soja-trigo.	
Thesagro: 	Cultivo Anual; Manejo do Solo; Pousio; Respiração do Solo; Soja; Trigo.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Trigo (CNPT)	
Exemplares: 	CNPT - (45396-1) - UPC - AP - DD -  -  -  - DIS