Banca de DEFESA: AMANDA BEATRIZ PINHEIRO DE SOUSA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : AMANDA BEATRIZ PINHEIRO DE SOUSA
DATE: 11/04/2025
TIME: 08:30
LOCAL: híbrido (link e local ainda a definir)
TITLE:

EFFECTS OF LAND USE ON RIPARIAN SOIL QUALITY AND ON THE POTENTIAL CONTRIBUTION OF DIFFUSE POLLUTION FROM TROPICAL RESERVOIRS

KEY WORDS:

Mapping; Eutrophication; Caatinga; Water quality, Soil Quality

PAGES: 41
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUBÁREA: Saneamento Ambiental
SPECIALTY: Qualidade do Ar, das Águas e do Solo
SUMMARY:

Permanent Preservation Areas are essential for the conservation of ecosystems and the
maintenance of soil and surface water quality. This study evaluated the effects of different
land uses on riparian soil quality and its influence on diffuse pollution in the Dourado and
Cruzeta reservoirs in the Brazilian semi-arid region. The hypothesis is that anthropogenic uses
degrade soil quality and enhance its capacity to contribute to diffuse pollution in water bodies.
Soils under vegetation, livestock, agriculture, and exposed land were analyzed, selected from
land use mapping within a 100-meter strip around the reservoirs. The soil attributes assessed
included sand, silt, clay content, soil density, pH, electrical conductivity, organic matter
content, and available phosphorus. Water quality was analyzed through limnological variables
such as temperature, pH, turbidity, electrical conductivity, total phosphorus and nitrogen,
organic and inorganic carbon, total suspended solids, organic and inorganic solids, and
chlorophyll-a. Statistical analysis involved descriptive statistics, Kruskal-Wallis test, and
Principal Component Analysis. The results indicate that the water and riparian soil quality of
both reservoirs are degraded, regardless of land use. Even areas mapped as natural cover have
vegetation incapable of functioning as an ecological filter, compromised by anthropogenic
factors such as livestock access for grazing, highlighting the need to improve the
classification system for this region. Soil attributes such as sand, silt, and pH, and water
quality variables, such as temperature, electrical conductivity, inorganic and organic carbon,
total phosphorus, organic suspended solids, and chlorophyll-a, showed statistical differences
between the reservoirs, reflecting environmental variations influenced by the characteristics of
the predominant soils. In Dourado, the Neossolo Litólico is shallow and highly susceptible to
erosion. In Cruzeta, the Luvissolo Crômico, although more structured, has an abrupt textural
change and also exhibits vulnerability to erosion. Thus, anthropogenic uses enhance the soils’
ability to contribute solids and nutrients to the reservoirs. However, while in Dourado the
excess of nutrients favors the growth of cyanobacteria, in Cruzeta, the high turbidity restricts
aquatic biomass but maintains the eutrophic condition of the water. In light of this scenario,
strategies such as reforestation with native species, sustainable agricultural practices, and
grazing control are essential for the recovery of the PPAs, reduction of diffuse pollution, and
ensuring the sustainability of water resources in the semi-arid region.

 

COMMITTEE MEMBERS:
Externo à Instituição - JOSÉ NEUCIANO PINHEIRO DE OLIVEIRA - IFCE
Interna - 1662859 - KARINA PATRICIA VIEIRA DA CUNHA
Interno - 1177742 - RONALDO ANGELINI
Presidente - 1764855 - VANESSA BECKER