Abstract
This study aims to quantify the carbon stock in young stands of forest restoration planted with native species on family farms in the north of the state of Rondonia. A forest inventory of the stands was carried out in 20 permanent plots. Biomasses of 20 sample trees located near each sample plot were determined by the destructive method. Laboratory analyses of carbon content in plant tissues were made on samples brought from the field. Biomass partitioning by compartments was evaluated and regression equations were applied for estimation from dendrometric inventory data. The total dry biomass was distributed as follows: 52% in shafts, 22% in branches, 13% in foliage and 13% in roots. The calculated carbon stock in the stands was 15.7 t.ha -1 at 75 months of age, which corresponds to an average annual carbon fixation of 2.5 t.ha -1 .year -1 . Such values represent a removal of carbon dioxide from the atmosphere of 57.6 tCO 2 eq.ha -1 and 9.2 tCO 2 eq.ha -1 .year -1 . It was concluded that, in spite of being young, the stands have an expressive stock of carbon, which corresponds to about 8.3% of what is stored in the Amazonian native forest.
Highlights
Since the beginning of the 1970s, high rates of deforestation have been observed in the Amazon (ARRAES et al 2012) driven by the advancement of infrastructure, incentives for productive activities and stand growth in the region (PRATES; BACHA, 2011)
The state of Rondônia has one of the highest rates of deforestation in the country, totaling 1,394 km2 in 2016 (INPE, 2016), becoming a significant emitter of greenhouse gases (GHG) into the atmosphere and threatening the environmental services provided by the forest (BASTOS et al, 2015)
The objective of this study is to quantify the carbon stocks in young forest restoration stands with native species in the Amazon region of Rondônia, to model it from tree measurement variables, and to evaluate the removal of dioxide carbon emissions from the atmosphere
Summary
Since the beginning of the 1970s, high rates of deforestation have been observed in the Amazon (ARRAES et al 2012) driven by the advancement of infrastructure, incentives for productive activities and stand growth in the region (PRATES; BACHA, 2011). The state of Rondônia has one of the highest rates of deforestation in the country, totaling 1,394 km in 2016 (INPE, 2016), becoming a significant emitter of greenhouse gases (GHG) into the atmosphere and threatening the environmental services provided by the forest (BASTOS et al, 2015). Forest restoration in the Amazon means a concrete action to recover its biodiversity and ecological functions, and to mitigate GHG emissions (SILVA et al, 2015). There are currently several programs aiming at restoring degraded areas (ANDRADE et al, 2014), but these actions can be more or less successful.
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