Dinâmica do carbono na regeneração natural em uma floresta manejada na Amazônia: estudo de caso Mil Madeiras Preciosas

Abstract

The future of the Amazon Forest and the consequences that deforestation can cause to climate change have been increasingly discussed by society. Thus, knowing the consequences that forest operations will bring to the dynamics of managed forests is extremely important, but precisely in terms of the forest it is acting as a carbon source or sink. For this reason, it is important to study the carbon cycle in natural regeneration, since most studies of biomass and carbon in native forests focus on the assessment of the upper strata. This work used data from continuous forest inventories carried out at Fazenda Dois Mil, owned by the company Mil Madeiras Preciosas, located in the municipality of Itacoatiara-AM. The objective of this work was to quantify the carbon stock present in the natural regeneration of a managed forest, as well as to study the carbon dynamics and to evaluate in different monitoring periods how the regeneration is behaving after the forest exploration. The inventories were carried out in the years 1996, 1997, 1998, 2001, 2014 and 2019. Individuals with 5 cm ≥ DBH <15 cm were considered natural regeneration of the forest. The estimated carbon for the study area was 13.0178 ± 2.2009 t.ha-1. The Annual Periodic Increment in carbon varied between 0.1814 to 0.5868 t.ha-1year-1. The entry and mortality rates were 18.02% and 32.52. UPAS B, C and D showed no statistically significant difference in relation to stock, increase, income and mortality. It is worth remembering that they had a difference in cutting intensity. The predominant factor that directly influenced the variation in carbon in the different monitoring periods was time. The managed forest recovered the carbon stock when the values of the measurement prior to logging were compared with the values of the last two measurements after logging, thus showing the ability to recover after forest management activity.