Rafael Henrique Roque

The main concern of forestry companies is to accurately estimate the productivity of their stands, as well as to characterize their areas of greatest productivity. With the advancement of technology, GIS (Geographic Information System) tools have gained space in forestry planning. In this research, the objective was to simulate the growth and productivity in a Pinus taeda L. plantation, evaluate its productive capacity through site curves and perform site interpolation through GIS tools. The study area of ​​this research was a P. taeda plantation composed of three ages (six, eight and nine years). A forest inventory was carried out in which 33 circular sampling units of 400 m² each were installed, randomly distributed throughout the area. For the analysis of growth and productivity, 32 trees of mean quadratic diameter (dg) were felled and for the analysis of the site index, 33 dominant trees (Hdom) were felled and the trunk analysis was performed. Growth and productivity predictions were adjusted to the Chapman-Richards model. The site index was obtained by adjusting the Schumacher model, while spatial interpolation of site classes was generated using Kriging. Growth and productivity predictions allowed determining the correct age for silvicultural interventions and the technical age of cutting, as well as the productive capacity of the area. Seven site curves were identified in the study area. The use of GIS tools allowed defining which areas are the most productive.

The aim of this study was to analyze volume yield, number of logs per assortment and economic feasibility of Eucalyptus dunnii stands under different management regimes. The stands are located in Fernandes Pinheiro, Paraná State, Brazil and cover a total area of 2.26 hectares, fragmented into three strata (treatments): A (8 years after coppicing regime), B (9-year old stand after two thinnings), and C (7-year old stand after one thinning). Diameters at breast height (d) of all trees and heights of 110 trees were obtained. The total height of the other trees was estimated by a hypsometric relationship. Tree volume was obtained through a taper function. For the economic analysis comparing the three strata, the periodic equivalent value (PEV) and the internal return rate (IRR) were evaluated considering an interest rate of 8%. The commercial volumetric estimates ranged from 156.61 to 375.53 m³ ha⁻¹. The stratum A yielded more logs, mostly for energy; stratum B yielded larger logs, and stratum C yielded similar number and volume of logs from all assortment classes. For economic analysis, PEV ranged from R$ 196.16 to R$ 1,255.79 ha year⁻¹, and IRR ranged from 12.73% per year (stratum A) to 21.35% per year (stratum C), based on a interest rate of 8%. It was concluded that the management condition of stratum C resulted in higher economic returns, with its product primarily destined for Sawmill 1.

Urban and peri-urban fragments are vital for biodiversity conservation, requiring genetic assessment of tree species in fragmented forests. The aim of this study was to analyze the genetic variability and diversity for adult individuals of J. micrantha along an urban-rural gradient in the Araucaria Forest. Fifteen individuals were sampled, with five from each remaining forest type. Initially, 10 ISRR primers were tested. Five mother trees were chosen from each site (urban, peri-urban, and rural) with a minimum distance of 100 m. The experimental design was a RCBD with 15 progenies, three provenances, three blocks, and 20 plants per plot, totaling 900 seedlings.