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Enzymatic Stoichiometry in Soils from Physiognomies of Brazilian Cerrado

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Abstract

The enzymatic stoichiometry allows assessing microbial C, N, and P acquisition, being used to indicate a nutrient limitation in soils. This study evaluated the enzymatic stoichiometry in soils from different physiognomies of the Brazilian Cerrado, trying to indicate a possible nutrient limitation in these areas. The enzymes β-glucosidase (BG), urease (U), and acid phosphatase (AP) were assessed in soil samples from three different physiognomies of Cerrado, namely, Campo Graminoide (CG), Cerrado Stricto Sensu (CSS), and Cerradão (CD). The activities of BG/U, BG/AP, and U/AP were used for calculating the enzymatic C/N, C/P, and N/P ratios, respectively. In addition, the vectors L and A, which are indirect indicators of P and N limitation to microbes, were assessed in soils. The enzymatic stoichiometry varied between physiognomies and seasons, with values of BG/U, BG/AP, and U/AP ratios being higher in the wet than the dry season. When comparing among physiognomies, the values of BG/U and BG/AP ratios increased from CG to CSS and CD. The vector A decreased from CG to CSS and CD. Together, the stoichiometry of enzymes approach and the analyses of vectors L and A suggest that soils from the different physiognomies of Cerrado could be P-limited. Thus, it requires further studies on P dynamics in Cerrado soils.

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Funding

This study was funded by Fundacao de Amparo a Pesquisa do Estado do Piauí – FAPEPI and Conselho Nacional de Desenvolvimento Científico e Tecnologico – CNPq (grant 305069/2018–1). Sandra Mara Barbosa Rocha thanks FAPEPI/CAPES for her fellowship. Ademir S. F. Araujo, Fabio F. Araujo, and Erika V. Medeiros thank CNPq for their fellowship of research. Lucas W. Mendes thanks FAPESP (grant 2020/12890–4) for his fellowship.

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Correspondence to Ademir Sergio Ferreira Araujo.

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Araujo, A.S.F., Bonifacio, A., Pereira, A.P.d.A. et al. Enzymatic Stoichiometry in Soils from Physiognomies of Brazilian Cerrado. J Soil Sci Plant Nutr 22, 2735–2742 (2022). https://doi.org/10.1007/s42729-022-00840-w

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  • DOI: https://doi.org/10.1007/s42729-022-00840-w

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