Banca de QUALIFICAÇÃO: HELIO BRITO DOS SANTOS JUNIOR

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : HELIO BRITO DOS SANTOS JUNIOR
DATA : 25/03/2020
HORA: 09:30
LOCAL: ICA/FLORESTA SALA 05 DA PÓS
TÍTULO:

“PHYSICAL AND CHEMICAL PROPERTIES OF LITTLE STOCK AS INDICATORS OF

RECOVERY IN CHANGED SUCCESSIONAL ECOSYSTEMS, IN THE EASTERN AMAZON”

PALAVRAS-CHAVES:

Litter storage; Litterfall; biogeochemical cycling

 

PÁGINAS: 49
GRANDE ÁREA: Ciências Agrárias
ÁREA: Recursos Florestais e Engenharia Florestal
RESUMO:

The litter contributes to the ecological and nutritional maintenance of ecosystems; for this reason, the physical and chemical properties substances are analyzed as a way to understand forest characterization, mainly when the ecosystem pass through some alteration, that is the case of this study which had three different methods of treatment: control, litter removal and irrigation. Thus, the following scientific questions were: (i) after 12 years of treatment, are there still differences in the physical and chemical properties of the litter between the three ecosystems? and, (ii) if there is a difference, which ecosystem has the higher values? Thus, the tested hypotheses were: (i) the values of the physical and chemical properties of the litter are still different, due to the time interval for using the treatments and the different methods applied; and, (ii) if the humidity in the litter favors biogeochemical processes, therefore the litter values are higher in the ecosystem that presented the irrigation treatment. The goal was to verify if there are still residual traces of treatments in the physical and chemical properties of the litter after 12 years. The study was accomplished in a secondary forest located at the Federal Rural University of the Amazon. Where it was installed 12 plots of size 20 x 20 m, distributed in four plots replicated for each treatment. In each plot, 10 litter samples were collected during four periods of the year with the support of a 0.25 x 0.25 m collector, in the total of 40 samples per treatment in each period. The variables analyzed for physical properties were the stock, density, thickness and water retention capacity; for the chemical properties, it was the concentration of nutrients contained in the litter. To test the hypotheses, a completely randomized design in a factorial arrangement was used 3 x 4 (ecosystems x four periods), and also, the Tukey test (p<0.05). The results of physical properties showed there is a statistical difference between the studied ecosystems, accepting the hypothesis (i). However, hypothesis (ii) was not accepted, that is, in 12 years the ecosystem that had total removal of litter managed to statistically match with the ecosystem that presented irrigation method, both having the higher values of physical properties. The results of chemical properties have not yet been analyzed.

MEMBROS DA BANCA:
Presidente - 388426 - FRANCISCO DE ASSIS OLIVEIRA
Interno - 741.673.590-49 - GUSTAVO SCHWARTZ - EMBRAPA
Externo à Instituição - VANDA MARIA SALES DE ANDRADE - NENHUMA
Externo à Instituição - WALMER BRUNO ROCHA MARTINS - NENHUMA