Banca de DEFESA: JOAO RAPHAEL LIMA AVELINO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JOAO RAPHAEL LIMA AVELINO
DATE: 23/02/2023
TIME: 09:00
LOCAL: meet.google.com/nyo-zzju-xwb
TITLE:

Enzymatic activity, microbial biomass and organic carbon in soil submitted different types of management

KEY WORDS:

Biological quality; Enzymatic activity; Soil degradation. 

PAGES: 45
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Microbiologia e Bioquímica do Solo
SUMMARY:

The conversion of native forest areas into cultivation areas causes losses in quality indices and functions in productivity, due to the reduction of plant biodiversity and the alteration of the physical, chemical and biological characteristics of the soil. Studies that quantify the biological characteristics present in the soil are very important, as these are active components in various processes and nutrient cycles, and can be used as indicators of their quality. The present work aims to evaluate the chemical changes in the soil, organic carbon, microbial biomass and enzymatic activity in soil submitted to different types of management. The research was carried out at the Santa Terezinha farm in the municipality of Angelim- PE, in six different soil treatments: (1) maize (KWS 9210 Pro) + Massai grass cultivar - without soil correction, (2) maize + forage BRS Tamani , (3) maize + Massai grass cultivar – with soil correction, (4) degraded pasture, (5) deforested native area and (6) preserved native area. In each treatment area, four samples were collected with an auger, at a depth of 0-10 cm in two different periods in June and September, corresponding to the dry and rainy seasons in the region. The evaluated factors were pH, cation exchange capacity, potential acidity, organic matter, soil organic carbon (SOC) and microbial biomass carbon (MBC) and determination of the enzymatic activity of the soil for β-glucosidase, urease, arylsulfatase, diacetate of fluorescein (FDA) and acid and alkaline phosphatase. The data obtained were organized in a 6x2 factorial scheme, six treatments and two seasons (rainy and dry). And they were submitted to the SNK statistical test (P = 0.05), using the SISVAR 5.6 software. The soils with the corn and grass intercropping showed a reduction in OM, SOC and microorganisms, which restored important processes related to the cycling of carbon, sulfur and nitrogen in a way that does not match those of the native forest area. The results of this study showed that the conversion of forest into an agricultural production area with a high level of human disturbance impacts on the decrease of β-glucosidase, urease, alkaline phosphatase and fluorescein diacetate activities in the soil. These findings suggest that human disturbance can cause substantial changes in enzyme activity and microbial community in soil.

COMMITTEE MEMBERS:
Presidente - KEILA APARECIDA MOREIRA
Interno - ALEXANDRE TAVARES DA ROCHA
Externo à Instituição - JOSÉ ERICK GALINDO GOMES
Externa à Instituição - MARIA CAMILA DE BARROS SILVA LEITE