Estoque de carbono na biomassa subterrânea de florestas de mangue

• Autor(a) principal: Santos, Daniel Medina Corrêa
• Data de Publicação: 2015
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/14305
• topic: Climate change; Reserva Biológica Estadual de Guaratiba; Teste de métodos; Mudanças climáticas; Reserva Biológica Estadual de Guaratiba; Teste de métodos; Manguezais - Guaratiba (Rio de Janeiro, RJ); Carbono; Biomassa; CNPQ::CIENCIAS BIOLOGICAS::ECOLOGIA

The belowground roots biomass in mangrove forests have been focus recently various studies, as well as other forest systems. This increase in the number of studies is related to the recognition of the capacity that this forest compartment have stock carbon. However it is still clear the low representation of studies of this biomass compartment of mangrove forests when compared to studies on aboveground biomass. But the underground roots can comprise more than half of the biomass of the forest system. The belowground biomass mangrove roots throughout the globe varies between 4.7 t ha-1 and 937.1 t ha-1 with an average of 172.4 t ha-1. While the carbon stock ranged between 1.9 tC.ha-1and 434.8 tC.ha-1, with an average of 75.6 tC.ha-1. For Biological Reserve State of Guaratiba (Rio de Janeiro, RJ - Brazil), where this thesis was carried out, the average carbon stock econtrada of 120.1 tC.ha-1 and biomass 267.9 t.ha-1 lying within the global and latitudinal variation range (10º and 25º). However the highest value of the belowground biomass and respective carbon stock in this study (348.94 tha-1 and 239.63 tC.ha-1) are higher than the higher values found for variation latitudinal range. As in most studies showed in the first part of the thesis, literature review, most of the biomass is found in the first layers of the surface, reaching an average of 50% in the first 0.4 m deep. As well as the contribution of the fine roots (less than 5 mm diameter) on average contribute most (about 80%) of the respective ground biomass and carbon stock, also following the results of other studies. The method used to obtain these estimates was excavate a trench of 1 m³ (1 m width x 1 m length x 1 m depth), being excavated 10 trenches 5 in fringe region and 5 in the basin area, allowing compare the two physiographic types and was verified that there is no statistically significant difference between them in relation to different diameter classes root . The only statistical significative difference between the physiographic types went to the carbon stock in the first layer. The method used in this study provides the collection of all classes and types of roots, giving all an overview of the belowground biomass, however due to their low practicality, was verified the feasibility of sampling to estimate belowground biomass through cores. This method, as seen in the literature review on the subject, is the most used to obtain the values of both belowground biomass and carbon stock associated with this. For such a test were collected 100 cores, 10 cores around each trench. Each core had a depth of 1 m and a diameter of 7 cm. When comparing the total carbon stock estimates obtained by the core method with those obtained by the trenches, no statistically significant difference was observed between the methodologies for both fringe, as for the basin. Therefore, considering the practicality of the cores sampling and the reliability of their results, it is recommended to use this sampling method, which will contribute to the expansion of carbon stock estimates the underground biomass of mangrove forests