Banca de QUALIFICAÇÃO: SOANY ELEN PALHETA DA CONCEICAO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : SOANY ELEN PALHETA DA CONCEICAO
DATE: 20/12/2023
TIME: 08:30
LOCAL: Auditório do ICA
TITLE:

SAMPLING INTENSITY, OPTIMAL PLOT SIZE AND SHAPE FOR ASSESSING FOREST GROWTH DYNAMICS

KEY WORDS:

forest inventory, permanent plots, annual periodic increment.

PAGES: 25
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUMMARY:

Forest inventory is the indispensable tool to quantify and qualify the potential of a forest, providing fundamental data for understanding forest succession. In forest planning, it is necessary to define the sampling intensity, size and shape of the parcels in order to minimize costs. In order to answer what the intensity of sampling, size and shape of plots influence forest growth, the objective of this study is to test the strength of samplering, the size and form of plants in an experimental area in the National Forest of Tapajós, Pará. In 1979, an exploration was carried out in the area and after that, in 1981 the monitoring of the growth of the forest began, by means of continuous forest inventory using permanent parcels (PPs). 36 PPs of 50 x 50 m (0.25 ha) were installed randomly in the experimental area of km 67. Each plot was subdivided into smaller units to facilitate the location and monitoring of the forest. The PPs were remedied in the years 1982, 1983, 1985, 1987, 1992, 1997, 2007 and 2012, 2014 and 2015. Trees with DAP ≥5 cm were measured and noted vulgar name, fist identification class (CIF) and forest status. The identification of the species was done in the field by Parabotanics of Embrapa and, when necessary, in the Herbarium of the East Amazon Embrape from collected botanical material. To assess the dynamics of the forest, mortality, recruitment and number of surviving trees were analyzed over time, after exploitation. Recruitment was considered the number of individuals that reached or exceeded the minimum diameter of 5 cm. In mortality, the number of individuals listed as dead between two subsequent measurements was considered. The trees that survived were all that remained over the years. The average annual periodic increase (IPA) was also analyzed between the years, as well as the absolute and relative frequency and for the analysis of the diametric distribution, diameter classes with the amplitude of 10.0 cm were established. To answer the scientific question, simulations of plot sizes and formats will be made using QGIS and R software. The partial results show that in the 2nd measurement (1982), there were 2 dead trees and over the years this number has increased substantially, until it reached the last measuring (2015) with 829 dead tree. The recruitment of individuals was highest in the first two years (1981-1982) with 1,603 and 822 individuals respectively. After that, it was decreasing and in the period (2012-2014) there was a gain of 794 recruits, with an average of 397 individuals in the 2 year period. In the following year (2015), the recruitment decreased to 239 individuals. The survival of the trees in the second year (1982) amounted to 9,782 individuals. Over the years this number has been fluctuating and in the period 1997-2007 (ten years difference), the average number of survivors per year was 669 individuals. However, last year (2015), there was a surviving tree jump, totalling 9,837 individuals. The 1982 average IPA was higher (0.45), decreasing in other years and increasing in 2014 and 2015, with 0.27 and 0.29 respectively. The absolute frequency per hectare was highest in 1992, with 1,240 individuals, already in 2012, 2014 and 2015 the absolute rates were 1,143, 1,149 and 1,096 respectively. The relative frequencies were higher in the first classes. The diametric distribution behaved decreasingly, being common in tropical forests. It is hoped that with the results of the simulations of the sizes and shapes of plots, the present study can indicate the situation that best evaluates the forest dynamics. The partial results show that the forest is re-establishing itself after an exploitation. Despite the fluctuations of the variables over the years, it appears that the forest responds positively through its growth, thus showing its resilience to anthropogenic actions and climatic events. This emphasizes the importance of studies related to sampling dynamics, growth and intensity.

BANKING MEMBERS:
Presidente - 745.945.679-91 - ADEMIR ROBERTO RUSCHEL - EMBRAPA
Externa à Instituição - FERNANDA DA SILVA MENDES - UEPA
Interna - 613.866.002-10 - FRANCIMARY DA SILVA CARNEIRO - UFRA
Externa à Instituição - MICHELLINY PINHEIRO DE MATOS BENTES - EMBRAPA
Interna - 091.940.156-27 - QÜINNY SOARES ROCHA - UNESP