CARBON STOCK AND SOIL AGGREGATION UNDER DIFFERENT USE SYSTEMS IN THE CERRADO

• Autor(a) principal: Falcão, Karina dos Santos
• Data de Publicação: 2020
• Outros Autores: Monteiro, Felipe das Neves, Ozório, Jefferson Matheus Barros, Souza, Camila Beatriz da Silva, Farias, Paulo Guilherme da Silva, Menezes, Roniedison da Silva, Panachuki, Elói, Rosset, Jean Sérgio
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Revista Brasileira de Ciências Ambientais (Online)
• Texto Completo: https://www.rbciamb.com.br/Publicacoes_RBCIAMB/article/view/695
• topic: Avaliação ambiental, estrutura do solo, qualidade do solo.; environmental assessment; soil structure; soil quality.

The objective of the work was to evaluate the carbon stock and soil aggregationin different management systems in the municipality of Aquidauana-MS. Soilsamples were collected in the 0.0–0.1 m layer, in six areas: exposed soil (ES),conventional brewing system (CB), no-till system (NT), sugar cane (SC), permanentpasture (PP), and native forest (NF). From the samples, the: total organic carbon(TOC) was determined, density of the soil (Sd), being calculated the carbon stock(EstC), and the variation in the carbon stock (ΔEstC), in addition to the aggregatestability analysis, obtaining: weighted average diameter (WAD), geometric meandiameter (GMD), and percentage of aggregates retained in the sieves. The resultswere analyzed in completely randomized design (CRD), in addition to canonicalanalysis. The highest Sd values were observed in the ES 1.53 Mg m-3, CB 1.46 Mgm-3, NT 1.47 Mg m-3, and SC 1.46 Mg m-3 systems. The TOC levels in the PP andNT areas were higher than the NF. EstC has the same TOC pattern. As the areas ofPP and NT presented values of WAD, GMD similar to NF. As PP, NT and NF areashad more than 60% of their aggregates larger than 2mm. A canonical analysisindicated the formation of 3 groups, one with ES and CB, another with onlySC, and the third composed of NT, PP, and NF. The ES committed the CB to thecarbon stock and soil aggregation in layer 0–10, whereas PP and NT increasedthe carbon stock in that same layer.