Banca de QUALIFICAÇÃO: YASMIM BORGES CÂMARA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : YASMIM BORGES CÂMARA
DATA : 26/09/2019
HORA: 08:00
LOCAL: Sala 02 - Prédio das Pós-Graduações
TÍTULO:

PRODUCTION, ACCUMULATION AND DECOMPOSITION OF UNDERGROWTH IN THREE FRAGMENTS OF ATLANTIC FOREST WITH DIFFERENT STAGES OF REGENERATION

PALAVRAS-CHAVES:

Remaining;Undergrowth ;Succession

PÁGINAS: 50
GRANDE ÁREA: Ciências Agrárias
ÁREA: Recursos Florestais e Engenharia Florestal
SUBÁREA: Conservação da Natureza
RESUMO:

The litterfall is a layer formed by organic material that is on the surface and subsurface of the forest soil, being the main source of nutrient transfer in the soil - plant system. Monitoring this process is critical to assessing the sustainability status of a forest. Based on this principle, the objective of this work was to evaluate the contribution, accumulation and decomposition of leaf litterfall in fragments with different succession stages in an area of Semideciduous Seasonal Forest. The fragments are located in the National Forest of Nisia Floresta, where F1 refers to the advanced regeneration stage, F2, medium regeneration stage and, F3, early regeneration stage. To analyze the litter input, 18 collectors (0.159 m2 each) were installed per fragment, totaling 54 collectors. Monthly, collected, dried, sorted and weighed in precision balance, all the litterfall deposited in the collectors. The accumulated litterfall was collected by using a metal frame (45 x 45 cm) thrown randomly 6 times in each fragment. That done, then went through the same drying and sorting process as the deposited burlap. Leaf decomposition was evaluated for 210 days using 54 litter bags 20 x 20 cm, 18 per fragment. Between the material deposited in F1 and F3, there was a reduction of 31.49% and between F2 and F3 was 32.49%. The highest accumulation occurred in the dry season (October / November) with the highest yield in F1 (434.621 kg ha-1) and the lowest in the wet season (June) with 53.710 kg ha^-1 in F2. Fragment 1 presented a 62.53% higher accumulation of litterfall (accumulated) when compared to F3, with greater deposition in the dry period. Regarding decomposition, during the first 60 days, F1 presented the lowest decomposition rate, containing a remnant of 70.16%, followed by F3 (66.70%) and F2 (66.34%). At the end of the experiment, the smallest remaining material was found in F1, with (46.88%), followed by F2 (47.04%) and F3 (54.44%). The litterfall decomposition was continuous over time, however, it was relatively slow, with a decomposition rate (K) of less than 1.  The accumulated material is in excess, which means a large litter input and a low decomposition speed. The largest contributor was the leaves fraction for the three areas, and the months with the largest and smallest contributions were November and June respectively. 

MEMBROS DA BANCA:
Interno - 049.666.234-13 - ALAN CAUÊ DE HOLANDA - UFERSA
Interno - 2087827 - MALCON DO PRADO COSTA
Externo à Instituição - ALLYSON ROCHA ALVES - UFERSA
Externo à Instituição - JOSE AUGUSTO DA SILVA SANTANA - UFRN