Banca de DEFESA: PRISCILA SILVA MATOS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : PRISCILA SILVA MATOS
DATE: 31/08/2021
TIME: 09:00
LOCAL: videoconferência
TITLE:

Assessment of soil quality in agroforestry systems.

KEY WORDS:

Sustainability, Agricultural systems, soil health.

PAGES: 120
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SUMMARY:

Agroforests are an excellent strategy to achieve food security due to the multifunctionality of these systems that increase food production while simultaneously enhancing social and environmental goals, as committed to the sustainable development goals (SDGs). Most importantly, agroforestry can improve soil quality by increasing soil organic matter, altering soil structure, fertility, and biological proprieties. Here, we show how agroforestry systems can improve soil quality. The objectives of this thesis are I) assess soil chemical, physical and biological properties across the unmanaged pasture, different agroforestry systems, and secondary forest; II) understand relationships between litter quality, soil organic matter (SOM), and critical soil quality parameters; III) Assess the sensitivity of land quality indices to detect differences caused by the land-use conversion. Soils, macroinvertebrates, and litter were collected in April, and September 2018 under five land uses, including three agroforestry systems, an unmanaged pasture, and a secondary forest in Sapucaia-RJ, Brazil. In the first chapter we founded that soil under agroforestry systems generally had higher soil fertility status and SOM and biological activity than either pasture or forest. The linkages between litter quality, SOM, and soil parameters suggest that high-quality litter inputs (i.e., low C: N ratio) together with SOM are essential for stimulating biological activity. In the second chapter, we found that the management practices had influenced arbuscular mycorrhizal fungi (AMF) sporulation and the number of total species in agroforestry systems and that the AMF community is correlated with crucial soil parameters. Also, Glomalin is an essential contributor to soil organic carbon (SOC), mainly in agroforestry systems and pasture plots. In the third chapter, we founded that the effects of the adoption of agroforestry systems in soil carbon fractions were noticed in the most superficial layers (0-5, 5-10 cm), mainly in the in the particulate fraction. Seasonality influences the dynamics of the SOC and its fractions. The carbon management index (CMI) was sensitive to detect changes by land-use change and showed that pasture accumulates carbon in the soil even with signs of degradation. In chapter four, the Soil Management Assessment Framework (SMAF) was sensitive for detecting soil quality changes induced by land uses.

 

BANKING MEMBERS:
Presidente - 2213075 - EVERALDO ZONTA
Externo à Instituição - FELIPE DA COSTA BRASIL - UVA
Externo à Instituição - PATRÍCIA ANJOS BITTENCOURT BARRETO-GARCIA - UESB
Interno - 387406 - RICARDO LUIZ LOURO BERBARA
Externa à Instituição - SANDRA SANTANA DE LIMA