Publicação
Estoques de carbono e nitrogênio em solo sob florestas nativas e pastagens no bioma Pantanal
| Resumo: | The objective of this work was to evaluate the impact of the conversion of native forests into cultivated pasture, and exposure of native pasture to continuous grazing, on the C and N stocks in the soil, in the Brazilian Pantanal wetlands. Three remnants of native forest, three areas with Urochloa decumbens pastures at different ages of formation, and one native pasture submitted to continuous grazing and without grazing for 3 and 19 years were evaluated. Soil samples were collected at 0–10, 10–20 and 20–40 cm depths, with three replications. The conversion of native forests into pastures promoted reduction of organic carbon and microbial carbon stocks in the soil, mainly in cultivated pastures with longer implantation time. However, no alteration in the total N stocks was observed. Carbon stock losses occurred in the three humic fractions but, proportionally, the main losses occurred in the humic and fulvic acid fractions. Cultivated and native pastures under continuous grazing are not capable of accumulating more C in the soil than the natural ecosystems. |
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| Autores principais: | Cardoso, Evaldo Luis |
| Outros Autores: | Silva, Marx Leandro Naves; Silva, Carlos Alberto; Curi, Nilton; Freitas, Diego Antônio França de |
| Assunto: | Desmatamento – Pantanal Ácidos húmicos Seqüestro de carbono Áreas inundáveis Deforestation – Pantanal Humic acids Carbon sequestration Wetlands |
| Ano: | 2017 |
| País: | Brasil |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | IBICT |
| Idioma: | português |
| Origem: | Oasisbr |
| Resumo: | The objective of this work was to evaluate the impact of the conversion of native forests into cultivated pasture, and exposure of native pasture to continuous grazing, on the C and N stocks in the soil, in the Brazilian Pantanal wetlands. Three remnants of native forest, three areas with Urochloa decumbens pastures at different ages of formation, and one native pasture submitted to continuous grazing and without grazing for 3 and 19 years were evaluated. Soil samples were collected at 0–10, 10–20 and 20–40 cm depths, with three replications. The conversion of native forests into pastures promoted reduction of organic carbon and microbial carbon stocks in the soil, mainly in cultivated pastures with longer implantation time. However, no alteration in the total N stocks was observed. Carbon stock losses occurred in the three humic fractions but, proportionally, the main losses occurred in the humic and fulvic acid fractions. Cultivated and native pastures under continuous grazing are not capable of accumulating more C in the soil than the natural ecosystems. |
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