Data/hora: 01/06/2024 00:56:32

Biblioteca(s): | Embrapa Agropecuária Oeste; Embrapa Florestas.
Data corrente: | 10/11/2014
Data da última atualização: | 06/03/2015
Autoria: | PIVA, J. T.; DIECKOW, J.; BAYER, C.; ZANATTA, J. A.; MORAES, A. de; TOMAZI, M.; PAULETTI, V.; BARTH, G.; PICCOLO, M. de C.
Afiliação: | JONATAS TIAGO PIVA, UFPR; JEFERSON DIECKOW, UFPR; CIMÉLIO BAYER, UFRGS; JOSILEIA ACORDI ZANATTA, CNPF; ANIBAL DE MORAES, UFPR; MICHELY TOMAZI, UFRGS; VOLNEI PAULETTI, UFPR; GABRIEL BARTH, Fundação ABC para Assistência Técnica Agropecuária; MARISA DE CASSIA PICCOLO, Centro de Energia Nuclear na Agricultura/USP.
Título: | Soil gaseous N2O and CH4 emissions and carbon pool due to integrated crop-livestock in a subtropical Ferralsol.
Ano de publicação: | 2014
Fonte/Imprenta: | Agriculture, Ecosystems and Environment, v. 190, p. 87-93, 2014.
Idioma: | Inglês
Conteúdo: | We assessed the impact of integrated crop-livestock (CL), with silage maize (Zea mays L.) in summerand grazed annual-ryegrass (Lolium multiflorum Lam.) in winter, and continuous crop (CC), with annual-ryegrass used only as cover-crop, on net greenhouse gas emission from soil (NetGHG-S) in a subtropicalFerralsol of a 3.5-year-old experiment in Brazil. Emissions from animal excreta in CL were estimated.Soil N2O fluxes after N application to maize were higher in CL (max. 181 g N2O-N m&#8722;2h&#8722;1) than in CC(max. 132 g N2O-N m&#8722;2h&#8722;1). The cumulative annual N2O emission from soil in CL surpassed that in CCby more than three-times (4.26 vs. 1.26 kg N2O-N ha&#8722;1, p < 0.01), possibly because of supplementary Napplication to grazed ryegrass in CL (N was not applied in cover-crop ryegrass of CC) and a certain degreeof soil compaction visually observed in the first few centimetres after grazing. The estimated annual N2Oemission from excreta in CL was 2.35 kg N2O-N ha&#8722;1. Cumulative annual CH4emission was not affectedsignificantly (1.65 in CL vs. 1.08 kg CH4-C ha&#8722;1in CC, p = 0.27). Soil organic carbon (OC) stocks were notaffected by soil use systems, neither in 0?20-cm (67.88 in CL vs. 67.20 Mg ha&#8722;1in CC, p = 0.62) or 0?100-cm (234.74 in CL vs. 234.61 Mg ha&#8722;1in CC, p = 0.97). The NetGHG-S was 0.652 Mg CO2-Ceqha&#8722;1year&#8722;1higher in CL than in CC. Crop-livestock emitted more N2O than CC and no soil OC sequestration occurredto offset that emission. Management of fertiliser- and excreta-N must be focused as a strategy to mitigate NO2 fluxes in CL.
Palavras-Chave: | Aquecimento global; Dairy livestock; Fertilização; Global warming mitigation; Mitigação; Subtropical soil.
Thesagro: | Gado; Solo.

Categoria do assunto:

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A Sistemas de Cultivo

Registro original: | Embrapa Florestas (CNPF)

Exemplares:

CNPF - (52940-1) - UPC - AP - DD -  -  -  - DIS
CPAO - (35511-1) - UPC - AP - PP -  -  -  - DIS