Avaliação do potencial de estoque de carbono por Sibipiruna (Poincianella pluviosa var. peltophoroides (Benth.) L. P. Queiróz) na arborização viária de Maringá - PR

Abstract

The study aimed to quantify sibipiruna trees (Poincianella pluviosa) carbon stock (C) and biomass, planted in the streets of Maringa, PR. Sample trees selection was based on the database for trees removal belonging to Maringá city hall. After that, trees were measured, evaluating: total height (Th), height at first fork (Haff), height of the first live branch (Hoflb), canopy height (Ch), crown area (Ca) and diameter at breast height (DBH). For the management and urban environment conditions, the following parameters were considered: open area, type of pruning, plant health, crown and trunk quality. Twenty-four (24) trees were with a DBH ranging from 45.1 to 70.0 cm, were selected. In felled trees, fresh biomass was measured (wood, bark, branches and leaves). For crown sampling, a sub-sample (10.0 kg) for leaves and fine branches was done and an amount of each component was taken for dry weight and C determination. Crown fresh weight (leaves and fine branches, thick branches and wood) was determined to load balance (10,000.0 kg). Wood sampling was done through disks (5.0 cm thickness) removal in the base, at DBH and at 90% of trunk length. Bark was removed from the disks, weighed and an amount aliquot taken for determination of dry matter and C. Samples were sent to Universidade Tecnológica Federal do Paraná - Campus Dois Vizinhos and oven (with air renovation and circulation), at 70.0 º C for 72 hours. In wood fraction, a composite sample from the tree's disks was done. After that, the fractions were weighed and milled for chemical analysis. Based on the relations between C amount and biomass and the dendrometric variables, were constructed linear regression models for each fraction. Inventory to determine C stock came from urban area stratification (northern, southern, central, east and west) where 10.0% of these neighborhoods were reflled, totalizing twenty-three (23); and them census was done. When evaluating the environment influence and the management on C stock and biomass, a multiple regression was used verifying interdependence. The total biomass accumulation by in the inventoried area was 1696.4 Mg, with 734.9 Mg C and for the urban area was 16,673.0 Mg of biomass and 7,695.6 Mg C storage. Northern area showed higher representativeness (53.1%) in C stock. The compartmentalization of C stock was: branches> wood > leaves> bark. Main factors that influenced the C stocks were: crown lifting pruning and vigorosus crown (leaves); survey crown lifting pruning, vigorosus crown and intact trunk (branches); fungi presence and vigorosus crown (bark); vigorous crown and trunks injuries (wood); crown lifting pruning, vigorosus crown and trunks injuries (total carbon). For the construction of protocols C sequestration in trees road is crucial to study the growth of trees in the urban environment to observe the growth of these answers, and implantation of appropriate management for a continuous increase in C stock these.