Banca de DEFESA: PAULO ROBERTO DIAS MARQUES JÚNIOR

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : PAULO ROBERTO DIAS MARQUES JÚNIOR
DATE: 09/08/2024
TIME: 09:00
LOCAL: Auditório do Centro de Pesquisa em Ciência do Solo da UFRPE
TITLE:

Soil and litter quality in areas under different uses in the semi-arid region

KEY WORDS:

Soil quality. Native forest. Soil management. Production and composition of litter.

Microbial properties of litter

PAGES: 129
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Manejo e Conservação do Solo
SUMMARY:

Soil quality represents the system's ability to maintain its ecosystem functions, with land use

and management having an impact on the alteration of its patterns by modifying the system's

properties. The aim of the study was to understand the change in soil quality and litter in native

areas, according to their properties and the change in land use. Six bimonthly soil samples were

collected from July 2023 to May 2024 in the 0-20 cm layer in areas under different land uses

in the municipality of Caruaru-PE. At the Instituto Agronômico de Pernambuco (IPA), samples

were taken from areas under native forest (NF1), tillage with the use of fire (TWF) and tillage

without the use of fire (TIL). At Fazenda Santa Maria (FSM), samples were collected from

areas under native forest (NF2), pasture with high animal stocking (PHS) and pasture with low

animal stocking (PLS). Leaf litter was only collected in the native areas. Soil quality indices

(SQI) were calculated for physical, chemical and biological properties, as well as ecosystem

functions. Leaf litter production, moisture content, C:N ratio, microbiological properties and

material stability were assessed. The soils under uses NF1 and NF2 had the best SQI, followed

by uses TIL and PLS with intermediate indices and LWF and PHS with the lowest SQI. Leaf

litter production was 4.30 t ha-1 and was lower in months with higher rainfall. The litter from

NF1 had a lower C:N ratio and higher humidity, microbial biomass and basal respiration,

contrary to what was observed for NF2. Forest soils have high quality standards that ensure

important processes in the landscape, with land use conversion and management acting to lower

these standards to high or low levels depending on the intensity of the practices in the

degradation of soil properties. Leaf litter is a strong ally in maintaining soil quality, with its

composition and microbiological activity differing between different native areas. It is

concluded that land use conversion and the exclusion of litter are factors that reduce soil quality

and its ability to maintain ecosystem functions. There is therefore a need to adopt management

practices with a lower impact on soil properties, or to preserve native forests, as measures to

maintain soil quality.

COMMITTEE MEMBERS:
Presidente - MARIA BETANIA GALVAO DOS SANTOS FREIRE
Interno - ADEMIR DE OLIVEIRA FERREIRA
Externo à Instituição - LUIZ FERNANDO CARVALHO LEITE - EMBRAPA