Bioindicators of Soil Quality in Mixed Plantations of Eucalyptus and Leguminous Trees

Pereira, Arthur Prudêncio de Araújo; Bini, Daniel; Rodrigues, Emanuela Gama; Santana, Maiele Cintra; Cardoso, Elke Jurandy Bran Nogueira

doi:10.1007/978-3-030-32365-3_9

Cited by 4 publications

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“…No studies have investigated enzyme stoichiometry in pure and mixed eucalypt and acacia plantations, especially in tropical soils. This is particularly important since tropical soils are limited in terms of organic matter (OM) and Acacia mangium presents the potential to improve soil fertility and ecosystem services (Cardoso et al, 2020;Pereira et al, 2020). These conditions can shift the enzymatic stoichiometry of nutrients, mainly C, N, and P. Thus, in this study we hypothesized that introducing the N 2fixing Acacia mangium could influence the enzymatic stoichiometry, mainly those enzymes related to nutrient cycling.…”

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confidence: 95%

Enzymatic stoichiometry in tropical soil under pure and mixed plantations of eucalyptus with N2-fixing trees

Pereira

Araújo

Santana

et al. 2023

Sci. agric. (Piracicaba, Braz.)

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Soil enzymes play a fundamental role in nutrient cycling in forest systems. The stoichiometry of C, N, and P-acquiring 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 N 2 -fixing trees could influence the enzymatic stoichiometry on C, N, and P cycling. The activity of β-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 N-acquiring enzymes were higher in E and E+N, while soil microorganisms invested in P-acquiring 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 P-acquiring enzymes to improve biological N 2 fixation promoted by diazotrophic bacteria associated to acacia.

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