Estimativa do estoque de carbono das florestas ombrófilas densas aluviais em municípios do Delta do Amazonas.

Abstract

This study aims to estimate the carbon stock of the tree community in the dense alluvial ombrophilous forest of the Amazon Delta. In 6 municipalities in the region 42 plots of 50m x 100m were installed, where the DBH of all individuals whose variable was ≥ 10cm was identified and measured. The study area was delimited by filtering Alluvial Dense Rainforests from the IBGE Vegetation Map. That of the inventory data, the height of the tree individuals was estimated using the Henricksen model adjusted from the data from Chave (2014). From the estimated height, the dominant height per plot was determined, which was used in the correction factor (fc) to estimate fresh biomass (PF) with an Manaus equation. Subsequently, the amount of carbon was calculated through simple multiplication by the water and carbon contents acquired in the literature. The stratified forest inventory was processed based on the estimated amount of carbon per plot, where two types of stratification were considered: 1st. 6 strata, being the municipalities; 2nd. 2 strata, being the hydrographic regions of the mouth of the Amazon River and the hydrographic region Rio Pará / Foz do Tocantins River. In the first stratification, the analysis of variance concluded that there is an advantage in this stratification, since it reduces the variance and increases the accuracy of the straps. It was also concluded that there is a geographical relationship of site quality, in which the dominant height and the dominant diameter, average of the 10% thickest trees, is greater in the hydrographic region of the Amazon River than in the hydrographic region of the Pará / Tocantins River. It was estimated that the dense alluvial rain forest in the Amazon Delta has a total of 285 million tons of carbon stock and an average of 135.98 t.ha-1. In the second stratification, it was concluded that, statistically, the average carbon stock of the alluvial dense ombrophilous forest of the hydrographic regions of the Amazon Delta are the same.