Pasture Recovery Period Affects Humic Substances and Oxidations of Organic Matter in Eastern Amazon
Carlos Augusto Rocha de Moraes Rego,
Juan López de Herrera,
Paulo Sérgio Rabello de Oliveira,
Luciano Cavalcante Muniz,
Jean Sérgio Rosset,
Eloisa Mattei,
Lucas da Silveira,
Marinez Carpiski Sampaio,
Marcos Gervasio Pereira,
Karolline Rosa Cutrim Silva,
Ismênia Ribeiro de Oliveira
Affiliations
Carlos Augusto Rocha de Moraes Rego
Chapadinha Science Center, Federal University of Maranhão, Chapadinha 65500-000, MA, Brazil
Juan López de Herrera
Departamento de Ingeniería Agroforestal, Universidad Politécnica de Madrid, Campus Ciudad Universitaria, Av. Puerta de Hierro, nº 2–4, 28040 Madrid, Spain
Paulo Sérgio Rabello de Oliveira
Center of Agrarian Sciences, University of Western Paraná, Marechal Candido Rondon 85960-000, PR, Brazil
Luciano Cavalcante Muniz
Center of Agrarian Sciences, State University of Maranhão, São Luís 65055-310, MA, Brazil
Jean Sérgio Rosset
Department of Agronomy, Mundo Novo University Unit, State University of Mato Grosso do Sul, Campo Grande 79070-900, MS, Brazil
Eloisa Mattei
Center of Agrarian Sciences, University of Western Paraná, Marechal Candido Rondon 85960-000, PR, Brazil
Lucas da Silveira
Center of Agrarian Sciences, University of Western Paraná, Marechal Candido Rondon 85960-000, PR, Brazil
Marinez Carpiski Sampaio
Center of Agrarian Sciences, University of Western Paraná, Marechal Candido Rondon 85960-000, PR, Brazil
Marcos Gervasio Pereira
Department of Soils, Federal Rural University of Rio de Janeiro, Seropédica 23890-000, RJ, Brazil
Karolline Rosa Cutrim Silva
Chapadinha Science Center, Federal University of Maranhão, Chapadinha 65500-000, MA, Brazil
Ismênia Ribeiro de Oliveira
Chapadinha Science Center, Federal University of Maranhão, Chapadinha 65500-000, MA, Brazil
Land management practices that overlook soil limitations and potential have led to varying degrees of degradation. This study evaluates the carbon content in chemical and oxidisable soil fractions across different pasture recovery periods, comparing them to secondary forests. The management practices assessed include the following: secondary forest (SF), perennial pasture (PP), perennial pasture recovered five years ago (P5), and perennial pasture recovered eight years ago (P8), all on Plinthosols. We analysed carbon levels in oxidisable fractions and humic substances at depths of 0–0.10 m, 0.10–0.20 m, 0.20–0.30 m, and 0.30–0.40 m. The SF and P8 areas showed the highest organic matter content within the humic fractions, compared to the PP and P5 areas. Additionally, the P8 area demonstrated an increase in the labile and moderately recalcitrant fractions of organic matter, standing out among the different fractions evaluated. The multivariate principal component analysis indicated that P8 has the greatest impact on soil quality, followed by FS, P5, and PP. The pasture recovery over the past eight years has significantly improved soil carbon accumulation, highlighting the benefits of land restoration.
