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Enzymatic stoichiometry in tropical soil under pure and mixed plantations of eucalyptus with N2-fixing trees
Pereira, Arthur Prudêncio de Araujo; Araujo, Ademir Sérgio Ferreira; Santana, Maiele Cintra; Lima, Antonio Yan Viana; Araujo, Victor Lucas Vieira Prudêncio de; Verma, Jay Prakash; Cardoso, Elke Jurandy Bran Nogueira.
Afiliação
  • Pereira, Arthur Prudêncio de Araujo; Universidade Federal do Ceará. Depto. de Ciência do Solo. Fortaleza. BR
  • Araujo, Ademir Sérgio Ferreira; Universidade Federal do Piauí. Centro de Ciências Agrárias. Teresina. BR
  • Santana, Maiele Cintra; Universidade de São Paulo. Escola Superior de Agronomia Luiz de Queiróz. Depto. de Ciência do Solo. Piracicaba. BR
  • Lima, Antonio Yan Viana; Universidade Federal do Ceará. Depto. de Ciência do Solo. Fortaleza. BR
  • Araujo, Victor Lucas Vieira Prudêncio de; Universidade de São Paulo. Escola Superior de Agronomia Luiz de Queiróz. Depto. de Ciência do Solo. Piracicaba. BR
  • Verma, Jay Prakash; Banaras Hindu University. Institute of Environment and Sustainable Development. Varanasi. IN
  • Cardoso, Elke Jurandy Bran Nogueira; Universidade de São Paulo. Escola Superior de Agronomia Luiz de Queiróz. Depto. de Ciência do Solo. Piracicaba. BR
Sci. agric ; 80: e20210283, 2023. tab, graf
Article em En | VETINDEX | ID: biblio-1367242
Biblioteca responsável: BR68.1
ABSTRACT
Soil enzymes play a fundamental role in nutrient cycling in forest systems. The stoichiometry of C, N, and P­acquiring enzymes has been used to indicate nutrient limitation in the soil. However, the enzymatic stoichiometry remains poorly understood in pure and mixed eucalypt plantations. Thus, this study aims to assess the activity of enzymes in the soil to address the hypothesis that the introduction of N2-fixing trees could influence the enzymatic stoichiometry on C, N, and P cycling. The activity of ß-glucosidase (BG), urease (U), and acid phosphatase (AP) was assessed in soil (0-20 cm depth) of pure Eucalyptus grandis without (E) and with N fertilization (E+N), and a mixed system with E. grandis and Acacia mangium (E+A), and a pure A. mangium (A) plantation at 27 and 39 months after planting. The activities of BG/U, BG/AP, and U/AP were used to calculate the enzyme C/N, C/P, and N/P ratios, respectively. Rates of N­acquiring enzymes were higher in E and E+N, while soil microorganisms invested in P­acquiring enzymes in A and E+A. The vector length and angle demonstrated that C demand by microorganisms does not change in relation to N and P, regardless of the treatment. However, N demand decreased in relation to P in A and E+A (mainly at 27 months). Our results suggest that enzymes activity in pure eucalypt systems is limited for their soil-litter nutrient contents. At the same time while acacia and mixed plantation seem to invest in P­acquiring enzymes to improve biological N2 fixation promoted by diazotrophic bacteria associated to acacia.
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Texto completo: 1 Base de dados: VETINDEX Idioma: En Revista: Sci. agric Ano de publicação: 2023 Tipo de documento: Article

Texto completo: 1 Base de dados: VETINDEX Idioma: En Revista: Sci. agric Ano de publicação: 2023 Tipo de documento: Article