Impacto da mudança de uso da terra nos estoques de nitrogênio em plintossolo de cerrado

Rafael Costa Schaidhauer de Almeida; Moacyr  Cunha Filho; Olavo da Costa Leite; Milton Marques  Fernandes; Renisson Neponuceno Araújo Filho

doi:10.1590/1983-21252024v3712299rc

Authors

Rafael Costa Schaidhauer de Almeida Postgraduate Program in Forestry and Environmental Sciences, Universidade Federal do Tocantins, Gurupi, TO, Brazil https://orcid.org/0000-0003-3764-9279
Moacyr Cunha Filho Department of Statistics and Informatics, Universidade Federal Rural de Pernambuco, Recife, PE, Brazil https://orcid.org/0000-0002-3466-8143
Olavo da Costa Leite Postgraduate Program in Forestry and Environmental Sciences, Universidade Federal do Tocantins, Gurupi, TO, Brazil https://orcid.org/0000-0002-8959-0064
Milton Marques Fernandes Department of Forest Sciences, Universidade Federal de Sergipe, São Cristovão, SE, Brazil https://orcid.org/0000-0002-9394-0020
Renisson Neponuceno Araújo Filho Postgraduate Program in Forestry and Environmental Sciences, Universidade Federal do Tocantins, Gurupi, TO, Brazil https://orcid.org/0000-0002-9747-1276

DOI:

https://doi.org/10.1590/1983-21252024v3712299rc

Keywords:

Soil organic matter. Soil management. Biomass. Forestry. No-tillage.

Abstract

The land use changes and different management forms promote modifications in soil organic matter (SOM), which imply the yield and sustainability of agricultural systems. SOM provides essential elements for plants, such as Nitrogen (N), one of its main constituents, and is also an indicator of soil quality. This study aimed to evaluate the dynamics of N levels and stocks in the soil of Plinthosol in the state of Tocantins, Brazil, under different uses (eucalyptus, corn, and pasture) compared to a natural ecosystem of Cerrado sensu stricto. Therefore, six trenches were opened in each study area to collect soil samples at 0-10, 10-20, 20-30, 30-40, and 40-50 cm soil layers, determining the contents and stocks (0-50 cm) of total N in the soil by dry combustion. The means were compared by the Tukey test at a 5% error probability level. N-S contents and stocks of the evaluated systems did not differ statistically from the reference area, except the eucalyptus area, which presented a higher average content, specifically in the 0-10 cm layer, and a higher average stock, considering the entire layer evaluated (0- 50cm). N-S stocks decreased in the following order across different land uses: eucalyptus > corn = pasture = Cerrado, probably indicating the effectiveness of the arboreal component in incorporating N-S as well as the importance of adopting conservation management practices that prioritize greater input and stabilization of organic matter in the soil.

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