Influence of land use and occupation on the chemical and physical fractions of organic matter in cultivated and native areas in the Atlantic Forest biome

  • Giovana Tetsuya Lopes Departamento de Solos. Universidade Estadual de Mato Grosso do Sul (UEMS), Unidade Universitária de Aquidauana, Rodovia Graziela Maciel Barroso, Km 12, Zona Rural, CEP: 79200-000, Aquidauana, MS, Brazil.
  • Jean Sérgio Rosset Departamento de Solos. Universidade Estadual de Mato Grosso do Sul (UEMS), Unidade Universitária de Mundo Novo, BR 163, Km 20,2, CEP: 79980-000, Mundo Novo, MS, Brazil.
  • Jefferson Matheus Barros Ozório Departamento de Solos. Universidade Estadual de Mato Grosso do Sul (UEMS), Unidade Universitária de Dourados, Cidade Universitária de Dourados, s/n, CEP: 79804-97, Dourados, MS, Brazil.
  • Ozielly Maiane Mendes da Silva Departamento de Solos. Universidade Estadual de Mato Grosso do Sul (UEMS), Unidade Universitária de Mundo Novo, BR 163, Km 20,2, CEP: 79980-000, Mundo Novo, MS, Brazil
  • Wesley Vieira dos Santos Departamento de Solos. Universidade Estadual de Mato Grosso do Sul (UEMS), Unidade Universitária de Aquidauana, Rodovia Graziela Maciel Barroso, Km 12, Zona Rural, CEP: 79200-000, Aquidauana, MS, Brazil
  • José Victor Hugo dos Santos Departamento de Solos. Universidade Estadual de Mato Grosso do Sul (UEMS), Unidade Universitária de Mundo Novo, BR 163, Km 20,2, CEP: 79980-000, Mundo Novo, MS, Brazil.
  • Andrea dos Santos Gonçalves Departamento de Solos. Universidade Estadual de Mato Grosso do Sul (UEMS), Unidade Universitária de Mundo Novo, BR 163, Km 20,2, CEP: 79980-000, Mundo Novo, MS, Brazil.
  • Eloi Panachuki Departamento de Solos. Universidade Estadual de Mato Grosso do Sul (UEMS), Unidade Universitária de Aquidauana, Rodovia Graziela Maciel Barroso, Km 12, Zona Rural, CEP: 79200-000, Aquidauana, MS, Brazil.

Abstract

This study quantified the C content of the chemical and physical fractions of SOM in different management systems in an Argisoil of sandy texture. The study was carried out in a reference area of Native Forest (NF), and in three managed areas: Permanent Pasture (PP), No-Tillage System (NTS) and an area of Private Natural Heritage Reserve (PNHR) in the process of natural regeneration. Soil samples were collected in the layers 0.0-0.05, 0.05-0.10 and 0.10-0.20 m. We assessed the soil density (Sd), total organic carbon (TOC) content, chemical fractionation of SOM with determination of the C contents of the fulvic acids (FA), humic acids (HA) and humin (HUM), with subsequent calculations of the HA/FA ratios, AE/HUM, stock (StockC), physical granulometric fractionation and determination of C contents of particulate organic matter (C-POM) and carbon management index (CMI). Higher TOC contents were observed for the NF area. The C-HA and C-HUM contents were higher in the NF and NTS. NF showed higher C-POM levels in all layers evaluated. For the C-MOM, the NTS area was superior to the other managed areas. The managed areas had lower StockPOM values than the NF. The managed areas had lower CMI values in relation to NF. The NTS area showed that, even in crop succession, it contributes to the improvement of the soil organic fraction over the adoption time. On the other hand, the areas of PP and PNHR showed that inadequate management favors the reduction of edaphic quality.

Keywords: carbon in soil, carbon management index, chemical fractionation, physical fractionation.


Published
20/07/2022
Section
Papers