Soil carbon fluxes and balances of crop rotations under long-term no-till

Autor(es)

Rigon, Joao Paulo Gonsiorkiewicz ; Calonego, Juliano Carlos

• Tipo de documento: Artigo Científico
• Fonte: Carbon Balance and Management; v. 15, n. 1, p. 11-pg., 2020-09-16.

Resumo

Background A field study with the same crop rotations was conducted to test the hypothesis that the soil Carbon fluxes and balances could vary according to the crop species and also mitigate carbon dioxide (CO2) emission. This study aimed to assess the CO(2)emission from crop rotations according to C and N inputs from crop residue, the influences on soil organic carbon (SOC) and total soil nitrogen (TN) stocks, identifying the soybean production systems with positive C balance. Triticale (x Triticosecale) or sunflower (Helianthus annuus) are grown in the fall/winter; sunn hemp (Crotalaria juncea), forage sorghum (Sorghum bicolor), pearl millet (Pennisetum glaucum), or fallow are the spring treatments, and soybean as a main crop in summer. Results We found that high C inputs from crop residues modify the C dynamics in crop rotations by reducing the C output (CO2) and increasing C sequestration in the soil. In general, the higher SOC, C stocks, and TN in soil surface were due to higher C and N inputs from sunn hemp or forage sorghum crop residues in spring. These crops also produced lower accumulated CO(2)emissions and, when rotating with triticale in the fall-winter season resulted in a positive C balance, making these soybean crop rotations more efficient. Conclusion Our study suggests the ideal crop species choice in a rotation can mitigate the CO(2)emissions by increasing C and N input from crop residues and consequently SOC and C stocks. In particular, crop rotation comprises an important tool to achieve a positive C balance, mitigate CO(2)emissions and provide an additional ecosystem service to soybean cultivation option. (AU)

• Processo FAPESP: 11/15361-3 - Emissão de gases de efeito estufa em áreas com diferentes rotações de culturas em sistema semeadura direta
• Beneficiário: João Paulo Gonsiorkiewicz Rigon
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 13/23359-4 - Sistemas de manejo e sucessões de culturas como fatores determinantes da quantidade e qualidade da matéria orgânica do solo.
• Beneficiário: João Paulo Gonsiorkiewicz Rigon
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/15589-2 - Matéria orgânica e dinâmica de carbono no sistema solo-planta-atmosfera em função de rotações de culturas em sistema semeadura direta
• Beneficiário: Juliano Carlos Calonego
• Modalidade de apoio: Auxílio à Pesquisa - Regular