Chemical attributes of soil in agroforestry systems is conditioned by the management system adopted

Luiz Augusto Silva De Sousa,Jessivaldo Rodrigues Galvão,Andreia Costa De Sousa,Gabriel Da Silva Vasconcelos,Mauro Junior Borges Pacheco

doi:10.33448/rsd-v9i10.8814

Luiz Augusto Silva De Sousa, Jessivaldo Rodrigues Galvão + Show 3 more

Open Access

https://doi.org/10.33448/rsd-v9i10.8814

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Abstract

The aim of this study was to evaluate the influence of vegetation management on soil chemical attributes during the implementation of an agroforestry system in Pará, Brazil. Three treatments were evaluated - T1 Control (secondary vegetation - SF), T2 - Fire management system (FMS) and T3 - Management system without vegetation burning (MSWB). Soil samples were collected at 30 cm deep to analyze chemical attributes. The data were analyzed using Analysis of Variance - ANOVA, and the t-test. Treatment T2 caused the most changes in soil chemical attributes on the first analysis showing increased pH, increased levels of N, P, K, Ca, Sum of bases, CEC and percentage of base saturation, and decreased potential acidity of Al in the short term. However, in the second evaluations 48 months later, there was an inversion, in which a reduction of pH, the contents of N, P, K, Ca, Sum of bases and percentage of base saturation, as well as increased potential acidity and of the contents of Al of the soil were observed. For treatments T1 and T3, there were no substantial soil attributes changes during the first and second evaluations. Thus, soil chemical attributes were altered according to the type of management of secondary vegetation and evaluation period during the implementation of Agroforestry Systems.

Highlights

Agroforestry systems are multifunctional systems that can provide a wide range of economic, sociocultural, and environmental benefits regarding the use of natural resources
In Brazil, the “Bragantina” region is mostly formed by a mosaic of secondary vegetation originated by Northeasterners, which dates back more than 400 years
This study aimed to evaluate changes in soil attributes in agroforestry systems under two managements, with and without burning of the “leftover” vegetation, during two years

Summary

Introduction

Agroforestry systems are multifunctional systems that can provide a wide range of economic, sociocultural, and environmental benefits regarding the use of natural resources. Among the benefits are the greater ability of agroforestry systems to synergically capture and utilize growth resources, recover degraded areas and enhance the secondary vegetation, contributing to a sustainable production REF. Soil fertility depends on anthropogenic actors like vegetation management and maintenance, as well as environmental factors, which can contribute to the depletion of the physical and chemical attributes of the soil. In this sense, there is a great unexploited potential of the systems, especially related to their development in secondary vegetation areas and their interference with the transformation of the soil organic matter stock, preserving or recovering fertility and, defining the productivity of the systems (SZOTT, et al, 1991). We hypothesized that initially burning can improve chemical attribute but it may not be sustained thru time

Methodology

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Findings

Final Considerations