Autoria: NASCIMENTO, A. F. do; LULU, J.; COLETTI JUNIOR, A.; FARIAS NETO, A. L. de; FERREIRA, A.; SPERA, S. T.; CARNEVALLI, R. A.

Resumo: Integrated crop-livestock-forestry (ICLF) systems have been used for food production in tropical environments,offering significant benefits to their components. However, shading can alter the exchange of energy and matter within the systems, directly affecting plant development and animal behavior and, ultimately, interfering with soil C and N dynamics. The aim of this study was to evaluate soil C and N pools in nine-year old integrated systems under the conditions of southern Amazon. The experimental systems comprised crop-livestock under full sunlight (ICL), moderately shaded ICLF (ICLFMS) and strongly shaded ICLF (ICLFSS), implemented in Sinop, Mato Grosso state, Brazil. Incidence of photosynthetically active radiation in ICLFMS and ICLFSS was suppressed by 18 % and 50 %, respectively, compared with ICL. The ICL presented the highest stocks of soil organic carbon (SOC; 84.9 Mg ha?? 1), total nitrogen (TN; 5.3 Mg ha?? 1), dissolved organic C (160 mg kg?? 1), and C and N stocks in the mineral-associated organic matter fraction, as well as the lowest C lability index. In contrast, ICLFSS exhibited the lowest values for these parameters (SOC; 71.6 Mg ha?? 1; TN 4.1 Mg ha?? 1), indicating that shading alters soil C and N dynamics, resulting in reductions more than 15 % of SOC and 22 % of TN compared with ICL. Furthermore, ICLFSS exhibited the highest levels of labile forms of C in the particulate organic fraction and the highest lability index. Hence, shading decreased the addition and stabilization processes of C and N in soil organic matter, resulting approximately 1.5 Mg ha?? 1 year?? 1 less C and 0.14 Mg ha?? 1 year?? 1 less N accrual. The results presented herein will support decision-making processes related to soil management strategies and the implementation of systems aimed at low-emission livestock-based protein production.

Ano de publicação: 2025

Tipo de publicação: Artigo de periódico

Unidade: Embrapa Territorial

Palavras-chave: Carbon management, Integrated agricultural systems, Shaded environments, Soil management, Soil organic matter