Banca de DEFESA: MARÍLIA CASTRO BRASIL DUARTE

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARÍLIA CASTRO BRASIL DUARTE
DATE: 11/09/2020
TIME: 08:30
LOCAL: online
TITLE:

The Biodegradation of tropical species wood affects plant development

KEY WORDS:

leaching, extractives, Schizolobium amazonicum, supression, mining 

PAGES: 48
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUMMARY:

Before the implementation and during the activities of major projects such as hydroelectric plants, road opening or mining, the removal of the native vegetation is necessary. Wood biodegradation products generated in log stockyards and wood waste interact with rainfall or volatilize, which can affect the environment. The objective of this work was to verify if the biodegradation of tropical woods stored under different conditions affects the soil properties and the initial growth of seedlings from the pioneer species Schizolobiumparahyba var. amazonicum (Huber ex Ducke) Barneby. The woods of four tropical species were selected: timborana (Pseudopiptadeniasuaveolens (Miq.) J. WGRIMES); yellowwood (Euxylophoraparaensis Huber);tamanqueira (Aegiphilaintegrifolia (Jacq.) Moldenke); and para-para (Jacarandacopaia (Aubl.) D.Don), collected from a bauxite mining company stockyard. The characterization of the chemical, anatomical and physical properties of the wood before and after storage in the soil wascarried out. Stocking was tested under three conditions: buried wood, positioned horizontally and positioned vertically. For the soil, pH, cation exchange capacity, organic matter, base saturation, aluminum saturation and macronutrients were obtained. In the germinated seedlings, biometric, biomass and biochemical properties were analyzed. The bioassay was conducted in a greenhouse. Preliminary results showed that the technological properties of the woods from different species resulted in different levels of biodegradation, and the yellow wood was remarkably resistant due to its anatomical and chemical properties, despite its basic densitysimilar to that of timborana wood. The intense biodegradation of Pará-Pará wood was due to its low basic density, while timborana wood showed high degradation despite its high basic density, which has been attributed to the high content of easily removable extractives of wood. The biodegradation of all woods modified soil properties and negatively affected the biometric properties and biomass production of Schizolobiumparahyba var. amazonicum (Huber ex Ducke) Barneby plants during initial growth.

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