Banca de QUALIFICAÇÃO: FERNANDA VITORIA SILVA DO NASCIMENTO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : FERNANDA VITORIA SILVA DO NASCIMENTO
DATE: 29/07/2022
TIME: 14:00
LOCAL: Google Meet
TITLE:

INFLUENCE OF SALINITY ON THE PERFORMANCE OF NATIVE SPECIES SEEDLINGS IN A CAATINGA RESTORATION PROGRAM

KEY WORDS:

Salinity; Caatinga; Restoration; Native species; Soil fertility.

PAGES: 27
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

The Caatinga is characterized by a semi-arid climate, high temperatures, high rates of evaporation and geological conditions that favor a greater accumulation of salts in the soil, which can harm the development of plants. Salinity has osmotic components related to the reduction in the water potential of the soil and ionic components causing an accumulation of ions in the different organs of the plant, generating disturbances in enzymes and membranes. To increase the efficiency of restoration in degraded areas with salinized soils, studies of plant responses to salinity are necessary. This study aims to analyze whether salinity influences the survival of native Caatinga species used in a salinity experiment. The study was conducted at FLONA de Açu-RN, in an experiment established on 3.3 ha of a degraded area of Caatinga. The site was divided into 155 plots, where native seedlings were planted at five different richness levels (1, 2, 4, 8, and 16). Samples were collected from the 155 experimental plots for analysis of chemical and fertility parameters (e.g. pH, P, K+, Ca2+, Mg2+, Al3+, and Na+). Soil salinity was calculated according to the Embrapa Methods Manual. For statistical analysis, Mixed Models were performed in R software, relating the continuous parameters of salinity and fertility (X) with the survival of monoculture and polyculture (Y). To assess whether the composition (X), polyculture and monoculture, has any effect on the soil parameters (Y) a MANOVA was performed, comparing all parameters that were not correlated. For salinity parameters, plots with higher Electrical Conductivity showed lower survival and those with higher Potassium (K) availability showed higher survival. In fertility, high Potassium (K) availability was also observed in plots with higher survival, while low Organic Matter availability generated lower survivals. MANOVA showed that overall there is no effect of composition (monoculture and polyculture) on soil parameters for both salinity and fertility. It is expected that species with lower survival are in more saline soils and those more adapted to saline conditions perform better. This work contributed to the choice of species resistant to saline stress in future restoration programs.

COMMITTEE MEMBERS:
Externo à Instituição - FELIPE PEREIRA MARINHO - SEMARH
Presidente - 1677189 - GISLENE MARIA DA SILVA GANADE
Externa à Instituição - MARINA VERGARA FAGUNDES