Dinâmica de carbono e nitrogênio em um sistema agroflorestal sucessional na região neotropical

Autores

DOI:

https://doi.org/10.20873/jbb.uft.cemaf.v9n2.nardoto

Palavras-chave:

isótopos estáveis de carbono, isótopos estáveis de nitrogênio, retranslocação de N foliar, decomposição da serapilheira, emissão de óxido nitroso

Resumo

O presente estudo teve como objetivo avaliar o efeito de quatorze anos de implementação de um sistema agroflorestal (SAF) sucessional e biodiverso em uma área agrícola degradada localizada na região de Cerrado do Brasil Central sobre a dinâmica de carbono e nitrogênio. Para verificar a dinâmica de N no curto prazo foram feitas medidas das taxas de transformação de N no solo em quatro períodos sazonais (chuva-seca, seca, seca-chuva e chuva) e para determinar a dinâmica de C e N no longo prazo foram analisadas as razões isotópicas de C e N no sistema planta-serapilheira-solo. Além disso, os seguintes parâmetros foram medidos: biomassa acima do solo, taxas de retranslocação de N foliar, e estoques de C e N no solo. A biomassa acima do solo foi de 19,2 Mg C ha-1. A taxa média de reabsorção de N foliar foi de 49,3%. A relação C:N foi de 20,4 ± 1,4 e 14,2 ± 0,32 na camada de serapilheira e na camada superficial do solo, respectivamente. O N-NH4 + do solo foi predominante sobre o N-NO3-. Após 40 dias, a emissão cumulativa de N-N2O foi de 0,33 kg ha-1. Os estoques médios de C e N foram de 3,8 Mg N ha-1 e 43,6 Mg C ha-1, respectivamente. O valor médio de δ15N do solo foi de 6,8‰, enquanto o valor médio de δ13C no solo foi de -20,3‰. Após 14 anos de implementação, aproximadamente 40% do C total na camada superficial do solo (0-20 cm de profundidade) mostrou ser derivado da entrada de biomassa oriunda do SAF, que é predominantemente do tipo fotossintético C3. O SAF estudado, que substituiu um campo agrícola degradado na região do Cerrado, mostrou-se responsivo tanto em termos de estoques e fluxos de C e N do solo e da planta.

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Publicado

11-06-2021

Como Citar

Pinheiro-Alves, R., Carvalho, A. M. de, Timoteo, L. G., Sampaio, J. A. G., Hoffmann, M. R., Coser, T. R., & Bielefeld Nardoto, G. (2021). Dinâmica de carbono e nitrogênio em um sistema agroflorestal sucessional na região neotropical. Journal of Biotechnology and Biodiversity, 9(2), 131–141. https://doi.org/10.20873/jbb.uft.cemaf.v9n2.nardoto

Edição

Seção

Biodiversidade e Meio Ambiente

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