Spatial distribution pattern of Euxylophora paraensis Huber in a natural managed forest in the Eastern Amazon

Abstract

The objective of this work was to characterize the spatial distribution pattern of the Euxylophora paraensis (yellowwood), to support conservation strategies of this species population in a managed 'terra firme' forest in the state of Pará. The study area is located in Fazenda Rio Capim, which belongs to The CKBV Florestal Ltda., in the municipality of Paragominas. For analyzing the spatial distribution of trees, geostatistics was used, based on the semivariogram modeling and kriging mapping. All evaluations had better adjustment to the spherical model, presenting the highest coefficient of determination in relation to the other models tested. Euxylophora paraensis presented an aggregate distribution pattern in the study forest, with spatial dependence described by the spherical model, forming tree clusters of size from 300 to 1000 m.

Geospatial Distribution of Forest Species in the Botanical Garden of Recife, Pernambuco, Brazil

“…The authors highlighted that, for the forest species analyzed, the best fits were obtained with the Spherical model. Brandão et al (2018), when studying the spatial distribution of Euxylophora paraensis Huber in natural forest managed in the Eastern Amazon, also reported that the best fit was obtained with the Spherical model. This occurs because the semivariogram of each forest species analyzed needs to be fitted with best model.…”

“…Estimates are generated from the information about sample position and the value of the variable at each point. Thus, the value of the variable and the coordinates (x and y) are obtained for each sampling point and used to construct the maps of distribution of forest species (BRANDÃO et al, 2018).…”

Anthropogenic disturbances stimulate natural regeneration of Euxylophora paraensis Huber in a forest fragment in the eastern Amazon

“…Gaps created in the forest canopy favor height growth but later, this growth decreases due to canopy closure by the lateral crown´s expansion. E. paraensis occupies the upper stratum requiring full sunlight to grow (Brandão, et al, 2018).…”

“…Brazilian yellowwood has a long history of use in Pará, where the wood's renowned beauty and structural robustness led to intense harvesting for use as flooring and finishing structures (Freitas, et al, 2019). The substantial exploitation of the species in the 1990s occurred without any planning and drastically reduced its natural populations (Brandão, et al, 2018). Consequently, the intense harvesting associated with restricted distribution and population reduction explained the inclusion of E. paraensis in the list of threatened species.…”

Diagnosis and Spatial Variability of Soil Fertility and Crop Production in a Teak Area in Eastern Pará State.

“…Next, the spatial dependence index (SDI) was calculated, determined by the ratio (C0 / (C0 + C1)), where SDI <0.25 is considered strong; when SDI is between 0.25 -0.75, it is considered moderate and when SDI> 0.75 it is considered weak (Cambardella et al, 1994;Brandão et al, 2018).…”