Introduction: Land uses associated with anthropogenic activities affect soil quality
Objective: To determine the effect of regeneration cuts on the physical and hydrological
properties of an Umbrisol.
Materials and methods: In each stand (parent trees [PT], clear cutting, selection,
regenerated area [post-fire] and reference [R]), in situ tests were performed and four
samples composed of soil by depth (0 to 20 cm and 20 to 40 cm) were collected. Data
were analyzed by Kruskal-Wallis and ANOVA tests. The physical variables (apparent
density [AD], porosity, silt, leaf litter and humus, mechanical resistance to penetration
[MRP], sand and clay) and hydrological variables (infiltration, field capacity, permanent
wilt point, available water and permeability) were related by means of the Spearman
Results and discussion: Differences were significant (P ≤ 0.01) in MRP, sand and clay
in the forest stand factor. For the depth factor, all the variables were similar, except for
the MRP; its increase in clear cutting was higher than 100 %, with respect to R. The
interaction was only significant (P ≤ 0.01) for the sand percentage. The Kruskal-Wallis
test (P ≤ 0.05) indicated that infiltration, humus and litter were lower in clear cutting.
There is a significant negative correlation (P ≤ 0.01) of AD with permeability, porosity,
clay and sand. PT and clear cuttings increased AD (24.28 and 37.58 %) and MRP
(32.59 and 222.22 %), with respect to R.
Conclusion: PT and selection cuts did not cause significant variations in properties
such as those of a total cut (clear cutting).