Banca de DEFESA: LEOCLÉCIO LUÍS DE PAIVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LEOCLÉCIO LUÍS DE PAIVA
DATE: 18/12/2019
TIME: 08:30
LOCAL: Sala de videoconferência - POP- RN
TITLE:

THE THINNING CHANGE PLANTING PRODUCTIVITY AND CONCENTRATION OF TANINS IN THE BARK OF Mimosa caesalpiniifolia Benth.?

KEY WORDS:

Secondary compounds, forest resources, tannic substances, mechanical damage.

PAGES: 74
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUBÁREA: Tecnologia e Utilização de Produtos Florestais
SPECIALTY: Anatomia e Identificação de Produtos Florestais
SUMMARY:

Plants naturally produce compounds, which can be classified as primary and secondary. Primers are useful for plant growth and development. Vegetable tannins are secondary compounds produced for the defense of the vegetable. The search for new tannin producing species and the understanding of how external factors act in their production is a way of responding to how plants behave in the face of interference. Thus, the objective of this study was to evaluate the interference of thinning technique on wood and tannin yield of a homogeneous planting of Mimosa caesalpiniifolia Benth. 85 months old, located in Macaíba/RN. M. caesalpiniifolia Benth. It is an option for the sustainable obtaining of forest resources (loggers and non-loggers) in the Northeast. Measurements of dendometric variables were taken and ten plants were cut down, five from a thinned field and five from a field without the technique. The thinning happened in two moments, the first being done at 12 months and the second at 55 months after planting. The volume and mass of wood and bark, the moisture content and the calorific value of the wood and the tannin content were determined by the total solids content (TST), Stiasny index (I) and the content of condensed tannins (TTC). Drywood yield was 26.70 t/ha in no-till planting and 22.80 t/ha in grated. The percentage of dry husk mass for both plantations corresponded to 16%. The calorific value of the wood found was 4,160.91 kcal/kg. TST in thinning individuals was 8.57 and 7.12% in those without mechanical damage. The TTC for individuals submitted to thinning was 5.12%, and in those not submitted the value found was 5.21%. The only variable that presented significant difference was the I, with the values with and without thinning, 59.83 and 79.31%, respectively. Thinning alters I, and individuals not submitted to mechanical damage with the highest index. The thinning as it was conducted favored the emission of stems and increased the frequency of lower diameter classes, rather than favoring the increase in DBH.

BANKING MEMBERS:
Presidente - 2326526 - TATIANE KELLY BARBOSA DE AZEVEDO CARNAVAL
Interno - 1079298 - ALEXANDRE SANTOS PIMENTA
Externa à Instituição - THAÍS BRITO SOUSA - UFLA