Quantificação De Biomassa E Estimativa De Estoque De Carbono De Indivíduos De Aroeira Em Um Fragmento De Floresta Estacional Decidual

Abstract

RESUMOEste estudo teve como objetivo caracterizar a estrutura paramétrica e o estoque de carbono de indivíduos dearoeira (Myracrodruon urundeuvaAll.) presente em um fragmento de floresta estacional decidual localizadoem Jataí, GO. Para avaliação do fragmento, foi realizado um censo, mensurando todos os indivíduos com cap (circunferência a 1,3 m do solo) ≥ 15,7 cm e georreferenciando-os. Após estabelecer as classes diamétricas,mensurou-se a altura total de 10 árvores por classe para o ajuste e seleção de um modelo hipsométrico e obtenção do volume, biomassae estoque de carbono. Foram identificados 1807 indivíduos distribuídos em toda a área do fragmento,os quais estão distribuídos em classes diamétricas com distribuição sigmoidal, com exceção para as árvores da primeira classe. O diâmetro médio das árvores foi de 15,5 cm. A equação hipsométrica selecionada para o povoamento foi ln (H) = 2,85102 -4,66042 dap -1 , com R 2 = 77,8% e erro padrão residual de ± 1,6 m. O volume de madeira oriundo dos indivíduos de aroeira mensurados foide 45 m³/ha, com produção de 40 t/ha de biomassa e estoque de 20 t/ha de carbono. Palavra-chave: Myracrodruon urundeuva All.; fragmento florestal; censo florestal; volume; alometria. ABSTRACTThis study aimed to characterize the parametric structure and carbon stock of individuals of aroeira (Myracrodruon urundeuva All.) present in a fragment Decidual Seasonal Forest located in Jataí, Goiás, Brazil. For evaluation of the fragment, a Forest Census was conducted, measuring up all individuals with cbh (circumference at breast height at 1.30 m) ≥ 15.7 cm. All trees measured were georeferenced. After establishing the diameter classes, measured to total height of 10 trees per class for setting and selecting a hypsometric model and obtain the volume, biomass and carbon stock. 1807 individuals were identified distributed in the area, which are divided into diameter classes with sigmoidal distribution, except for the trees of the first class. The average diameter tree was 15.5 cm. The hypsometric equation selected for the settlement was ln (H) = 2.85102 -4.66042 dap -1 with R 2 = 77.78 % and residual standard error of ± 1.6 m. The volume of wood obtained was 45 m³/ha with production of 40 t/ha of biomass and of 20 t/ha of stock carbon.

Although it lacks connectivity, isolated urban forest fragments can deliver similar amounts of ecosystem services as in protected areas

“…Small branches and leaves were collected from all species for proper identification, and the species were recorded in the herbarium of the Forest Engineering Department (HUCO). The estimation of above-ground biomass and carbon storage was performed using indirect methods and models (Chart 1) proposed by Chave et al (2014), Martins (2011), andRatuchne (2010). To ensure repeatability within each fragment and enable comparative analysis with the tested models, data from 10 plots of 200 m² were combined, resulting in 5 plots of 2,000 m² per study area.…”

“…This procedure was adopted considering that, on average, carbon content represents 50% of tree biomass in the Mixed Ombrophilous Forest (Watzlawick et al, 2014). Additional models used for comparisons were proposed by Ratuchne (2010) and Martins (2011) based on data acquired from forest fragments in the Mixed Ombrophilous Forest ecosystem, specifically the Montana type. Both authors proposed models for estimating above-ground biomass (Table 1, Equation 2 and 4) and carbon storage (Table 1, Equations 3 and 5).…”

“…Table 1: Equations from the models used to estimate the above-ground biomass (P) and the carbon storage (C), being Equation 1 from Chave et al (2014), Equations 2 and 3 from Ratuchne (2010), and Equations 4 and 5 from Martins (2011). Data acquisition was carried out on each rainy day for an entire month, in the period corresponding to the middle of the different seasons from 2019 to 2020, that is, between April and May (autumn), July and August (winter), October and November (spring) and January and February (summer).…”

Climate and the Myracrodruon urundeuva Allemão seed production

“…However, the exploration has been done in an extractive and disordered way, causing an impact on natural populations (Monteiro et al, 2005). This species has adaptive plasticity, which can be found in different Brazilian phytophysiognomies, from humid to dry environments (Matias et al, 2017). M. urundeuva seeds from the Caatinga biome demonstrated broad tolerance to environmental stresses, with thermal limits for germination between 7.4 and 53.3 ° C and an osmotic limit of -0.6 MPa (Oliveira et al, 2019).…”

Conservação in vitro da aroeira (myracrodruon urundeuva fr. Allemão) e estabelecimento in vitro da baraúna (schinopsis brasiliensis engl.)

“…A aroeira, aroeira do sertão ou urundeúva (Myracrodruon urundeuva Allemão) é uma planta caducifólia, exigente em luminosidade, com capacidade de viver em condições de clima semiárido e com tamanho que varia conforme a região de sua ocorrência (LORENZI, 2002;ANDRADE et al, 2000), podendo atingir 30 m de altura e até 1 m de diâmetro. Essa espécie possui plasticidade adaptativa, podendo ser encontrada em diferentes fitofisionomias brasileiras, desde ambientes úmidos a secos (MATIAS et al, 2017).…”