SOIL ENZYMATIC ACTIVITIES IN AREAS WITH STAGES AND MANAGEMENT OF FOREST REGENERATION FROM CAATINGA

Andrezza Emanuella Oliveira Silva,Érika Valente De Medeiros,Ignácio Hernan Salcedo,Laerte Bezerra De Amorim,Euzelina Dos Santos Borges Inácio

doi:10.1590/1983-21252018v31n217rc

Abstract

ABSTRACT The tropical dry areas have suffered the most severe anthropic pressures. This factor motivates studies aimed at characterizing and monitoring the soil quality to determine the management measures to apply and to suggest appropriate recovery procedures. The objective of this study was to evaluate the enzymatic activity of acid and alkaline phosphatases, urea and arylsulfatase in the superficial layers of soils in areas under different stages of forest regeneration, in Floresta-PE City.. Soil sampling was conducted at 0-5, 5-15 and 15-30 cm layer in the following areas: C-18 (vegetation regeneration for 18 years), P-13 (13 years), L-12 (12 years), C-9 (9 years), C-7 (7 years) and G-4 (4 years). The analytical methods used in the study were based on the incubation of the soil samples with a buffered solution of substrate specific for each enzyme. The methods were based on colorimetric determinations. The activity of acid and alkaline phosphatase and urease represented sensitive measures for detecting changes in soil quality at various stages of regeneration in tropical dry forests. The area with the longest duration of forest regeneration (C-18) showed higher enzyme activities. The soil enzymatic activities respond to different stages and management of forest regeneration in Brazilian tropical dry areas, namely Caatinga. The acid and alkaline phosphatase, arylsulfatase and urease increased with time of regeneration.

Highlights

The use of tropical dry forests (TDF) has focused on the extraction of timber products to satisfy the demands of human population (FOLEY et al, 2005)
Significant differences were compared through the Student Newmna-Keuls test at 5 % probability for each layer
These data and the results of the chemical analysis were subjected to a multivariate statistical analysis to identify the attributes most responsible for the variation between the different stages of forest regeneration

Summary

Introduction

The use of tropical dry forests (TDF) has focused on the extraction of timber products to satisfy the demands of human population (FOLEY et al, 2005). Clear felling of trees and shrubs is a productive type of management that is widely practiced in Brazilian TDF (MMA, 2008). This management method involves the regular trimming of trees that are valuable for their wood properties and allows local recovery via natural regeneration (MEDEIROS et al, 2017). The principal challenges faced by forest managers is to maintain biodiversity and the integrity of the forest and at the same time meet human needs through productive activities (BURKE et al, 2008)

Objectives

Methods

Results