Banca de QUALIFICAÇÃO: CRISTIANE GOMES DA SILVA OLIVEIRA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : CRISTIANE GOMES DA SILVA OLIVEIRA
DATE: 27/01/2026
TIME: 13:00
LOCAL: Departamento de Zootecnia
TITLE:

Carbon and nitrogen stocks, nutrient cycling, and soil characteristics in pastures under silvopastoral and monoculture systems in the Agreste region of Pernambuco.

KEY WORDS:

C and N stock
nutrient circulation
soil fertility

 

PAGES: 50
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Pastagem e Forragicultura
SPECIALTY: Avaliação, Produção e Conservação de Forragens
SUMMARY:

The native pasture of the Caatinga is characterized by low carrying capacity and vulnerability of the vegetation and soil. Given this scenario, the use of silvopastoral systems presents itself as an option to intensify animal production on pasture in a sustainable way and increase land use efficiency. In this sense, the objective of this project will be to evaluate the effects of the silvopastoral system of *Urochloa decumbens* (Stapf) R. D. Webster) with the native leguminous tree *Mimosa caesalpiniifolia* Benth. on carbon and nitrogen stocks, cycling of microbial indicators, fertility and physical quality of the soil. The project will be carried out at the Experimental Farm of the Federal Rural University of Pernambuco, in the municipality of Garanhuns, Agreste region of Pernambuco and will last two years. The experimental treatments will be: 1) pasture under a silvopastoral system of Brachiaria grass with sabiá; 2) Brachiaria grass pasture in monoculture without fertilization; 3) Brachiaria grass pasture in monoculture with fertilization (50 kg of N, P and K.ha-1.year-1) and 4) sabiá grove in monoculture. The experimental design will be randomized blocks, with three replications. The experimental area is approximately 9.8 ha. The animals used will be crossbred male cattle (Holstein x Zebu) without castration, with an average body weight of 170 kg. The grazing seasons will be annual and will have an average duration of 10 months, during which the animals will remain in the pasture for the entire period. The following will be evaluated: Total organic carbon (C) and total nitrogen (N), soil density, C and N stocks, basal respiration, microbial biomass carbon, metabolic quotient, C/N ratio, chemical analyses (pH, P, K, Ca, Mg, Al, and H), and N2 fixation. In addition to chemical analyses, fractionation by density of organic matter and physical analyses will be performed to determine particle size distribution, field capacity, permanent wilting point, available water in the soil at each depth, and soil compaction. The nutrient contents (C, N, P, K, Ca, and Mg) of the Brachiaria grass pasture, trees (leaves and thin branches), litter, and feces will also be determined. Furthermore, the decomposition of legume and grass litter and atmospheric N in the legume will be evaluated. Statistical analysis will be performed using SAS®
OnDemand for Academics, using PROC MIXED. Treatments will be considered as a fixed effect, while blocks, years, and experimental errors will be considered as a random effect. Evaluations will be analyzed as repeated measures over time. Means will be analyzed as repeated measures over time. Means will be compared using Tukey's test at a 5% significance level. This project will contribute to the progress of livestock farming in the Agreste region of Pernambuco, since silvopastoral systems represent a land use technique that ensures greater biodiversity and sustainability to ecosystems, and can improve the supply of quality forage, increase land productivity, generate environmental, economic, and social benefits, improving and modifying the income of rural producers.

 

COMMITTEE MEMBERS:
Interno - ALEXANDRE CARNEIRO LEAO DE MELLO
Interno - FRANCISCO FERNANDO RAMOS DE CARVALHO
Presidente - ***.517.214-** - JOSE CARLOS BATISTA DUBEUX JUNIOR - UFRPE
Interno - MARCIO VIEIRA DA CUNHA
Externo ao Programa - 385061 - MARIO DE ANDRADE LIRA JUNIOR - nullInterna - MERCIA VIRGINIA FERREIRA DOS SANTOS
Interno - VALDSON JOSE DA SILVA