Effects of condensed tannins on greenhouse gas emissions and nitrogen dynamics from urine-treated grassland soil

Autor(es)

Siniscalchi, Debora ; Cardoso, Abmael da Silva ; da Cruz Correa, Darlena Caroline ; Ferreira, Mariane Rodrigues ; Barbosa Andrade, Marina Elizabeth ; Gomes da Cruz, Luana Hybner ; Ruggieri, Ana Claudia ; Reis, Ricardo Andrade

• Tipo de documento: Artigo Científico
• Fonte: Environmental Science and Pollution Research; v. 29, n. 56, p. 10-pg., 2022-07-05.

Resumo

Condensed tannins are a potentially important treatment option to mitigate N2O (nitrous oxide) and affect carbon dioxide (CO2) and methane (CH4) emissions; however, their effect has been poorly assessed. Here, we quantified the emissions of N2O, CH4, and CO2, soil N mineralization, and nitrification with increasing doses of condensed tannins added to the urine of cattle raised on pasture. The experiment consisted of incubation with doses of 0%, 0.5%, and 1.0% of condensed tannins added directly to the collected urine. The experimental design was completely randomized. Greenhouse gas fluxes were quantified for four weeks using static chambers and gas chromatography. The addition of condensed tannins increased N2O emissions (P < 0.05), with total emissions averaging 95.84 mg N-N2O kg(-1), 265.30 mg N-N2O kg(-1), and 199.32 mg N-N2O kg(-1) dry soil in the treatments with 0%, 0.5%, and 1% tannins, respectively. Methane emissions were reduced with the addition of tannins (P < 0.05), with total emissions of 8.84 g CH4 kg(-1), 1.87 g CH4 kg(-1), and 3.34 g CH4 kg(-1) dry soil in the treatments with 0%, 0.5%, and 1% tannins, respectively. Soil respiration increased with the addition of condensed tannins (P < 0.05), with total emissions of 3.80 g CO2 kg(-1), 6.93 g CO2 kg(-1), and 5.87 g CO2 kg(-1) in dry soil, in the treatments with 0%, 0.5%, and 1% tannins, respectively. The addition of condensed tannins reduced N mineralization and nitrification. We found evidence that the use of condensed tannins might not be a suitable option to mitigate N2O emissions. However, soil CH4 emissions can be abated. The increases in soil respiration suggest that tannins affect soil microorganisms, and the effects on CH4 and N2O could be related to the variation in the soil microbiome, which requires further clarification. (AU)

• Processo FAPESP: 17/02914-0 - Perdas de nitrogênio em pastos de braquiária adubados com doses crescentes de nitrogênio
• Beneficiário: Débora Siniscalchi
• Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico
• Processo FAPESP: 17/11274-5 - Decomposição de serrapilheira e emissão de gases de efeito estufa em pastos de Brachiaria adubados com doses crescentes de nitrogênio
• Beneficiário: Abmael da Silva Cardoso
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/16631-5 - Estratégias de manejo para redução de impactos ambientais em sistemas de produção de bovinos de corte
• Beneficiário: Ricardo Andrade Reis
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático