Banca de DEFESA: ANA LUCIA NUÑEZ VILLALOBOS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE: ANA LUCIA NUÑEZ VILLALOBOS
DATA: 28/08/2026
HORA: 08:00
LOCAL: DCS10
TÍTULO:

Land Use Change from preserved Cerrado and Caatinga to perennial crops:
effects on Arbuscular Mycorrhizal Fungal Communities

PALAVRAS-CHAVES:

Coffee, banana, Diversity indices, spore morphology, soil biodiversity

PÁGINAS: 76
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Ciência do Solo
ESPECIALIDADE: Microbiologia e Bioquímica do Solo
RESUMO:

Arbuscular mycorrhizal fungi (AMF) are key components of soil biodiversity and may
respond to land-use change, agricultural management, seasonality, and soil
physicochemical conditions. This study evaluated AMF communities across two
contrasting agricultural landscapes in Minas Gerais, Brazil: coffee production systems
established in the Cerrado and irrigated banana plantations in the Caatinga. In the
Cerrado, conventional (C) and non-conventional (N QC) coffee management systems
were compared with adjacent preserved vegetation during dry and rainy seasons,
whereas, banana plantations were compared with preserved vegetation in the Caatinga .
AMF spores were extracted from soil samples and morphologically identified.
Community abundance and diversity were evaluated using Hill numbers of orders q =
0, q = 1, and q = 2, together with univariate and multivariate analyses of soil
physicochemical properties. In the Cerrado, differences in AMF abundance and
diversity between conventional and non-conventional coffee systems were only
observed in few sites. Abundance differed in two out of six plot pairs, one favoring NC
and the favoring C. Q0 differed in only one site favoring NC. Q1 differed in two plot
pairs, one favoring NC in dry season and C in the wet season and other favoring NC
only on the rain. Q2 behaved similar to q1 in the same plots. Differences in abundance
between Cerrado and coffee plots were generally more frequent in the rainy season
favoring coffee plots. Differences in q0 occurred mainly on the dry season (four out o
12 plot pairs), favoring NC in relation to cerrado. Differences in q1 occurred mainly on
the wet season (8 out o 12 plot pairs), favoring NC in six plot pairs and C in two plots.
Differences in q2 occurred mainly on the wet season (7 out o 12 plot pairs), favoring
NC in five plot pairs and C in two plots. Coffee systems frequently maintained
diversity comparable to, or in some cases higher than, adjacent Cerrado vegetation, and
multivariate analyses indicated considerable overlap among management systems and
native areas. In the Caatinga, native forest showed that abundance, species richness,
Shannon diversity, and Simpson diversity did not differ significantly between land-use
systems. AMF community composition differed between banana and native forest areas.
A substantial number of AMF species were shared between cultivated and native
Caatinga areas, indicating persistence of a common core community despite land-use
conversion. Overall, the two studies indicate that perennial crop systems can maintain
substantial AMF abundance and diversity, while community composition is more
sensitive to environmental variation. Across both biomes, soil physicochemical
conditions and, in the Cerrado, seasonality appeared to exert stronger influences on
AMF communities than agricultural management or land use alone.

MEMBROS DA BANCA:
Interno - TEOTONIO SOARES DE CARVALHO (Membro)
Externo ao Programa - RUBENS MANOEL DOS SANTOS - DCF/ESAL (Membro)
Externo à Instituição - PATRÍCIA LOPES LEAL - UFBA (Membro)
Externo à Instituição - ORIVALDO JOSE SAGGIN JUNIOR - EMBRAPA (Suplente)
Externo à Instituição - MÁRCIA RUFINI - UFLA (Suplente)
Externo à Instituição - JACQUELINE SAVANA DA SILVA - UFLA (Membro)
Presidente - FATIMA MARIA DE SOUZA MOREIRA (Membro)