After the tree planting period, the phase known as post-implementation consists of the maintenance of the future forest. It is important to protect planted saplings especially from the negative effects of opportunistic weeds, insects such as the leaf-cutting ants and diseases. When necessary, new seedlings are to be planted replacing seedlings which have not flourished. These measures are taken to offer ideal conditions for the development of the seedlings, as well as to promote their establishment. A successful reforestation programme depends on efficient management and its periodicity. In general, maintenance should take place every 90 or 120 days, counted from the planting day or period. On a long-term period, maintenance contributes for the reestablishment of ecological services.
Ecosystem services provided by a restored area can improve local and regional microclimate, water regulation, stability of slopes, increased quality and quantity of water resources and the reestablishment of biodiversity through the connection of forest fragments.
To verify whether the new forest is developing well and fulfilling its ecological role, it is necessary to monitor and evaluate its growth. We have two monitoring steps: the first one, which follows INEA (Environmental State Agency in Rio de Janeiro) Resolution No. 143 from 2017, that checks the quality of restored areas; and the second one, which evaluates the accumulated biomass and carbon stock in restored areas by ‘Guapiaçu Project’ Petrobras funded project.
The first stage of monitoring happens annually after the tree planting has taken place. The main purpose is to fulfil commitments and legal obligations following INEA`s resolution. At this stage, the methodology chosen is the Rapid Ecological Diagnosis – DER. The procedure to monitor the restored area’s development is based on the direct measurement of seven ecological parameters, which are: density of the planted area, percentage of zoochoric species, height of plants, equitability of individuals, species richness, canopy and grass cover. While measuring these parameters, the spontaneous arrival of new individuals of plants on the restored area can be verified, some older trees are expected to be flowering or fruiting (especially the pioneer species) and also animals on site should be able to be noticed, such as insects, birds, rodents and small mammals.
The second monitoring stage is carried out when four years have passed by. The first 100 ha tree planting that took place in the first stage of the Guapiaçu Project between the years of 2013 and 2015 received carbon certification by the Biodiversity Community Climate Alliance (ACCB). This certification provided a quality seal to these reforested areas. Tree planting carried out in the subsequent phases of this project (more 160 hectares) were incorporated into the biomass accumulation monitoring plan, according to the methodology and assumptions certified with the ACCB, and will be able to receive certification after completing four years since implementation.
Biomass monitoring takes place from the fourth year on because it requires the saplings to have their DBH (Diameter at breast height) more developed so that one can use it as a parameter in the application of allometric equations. These equations are used for the analysis of biomass and carbon stock in the plantations, as well as to obtain the values of CO2 sequestered by the new forest. With that, REGUA took the commitment to monitor the biomass accumulation in these plots over the next 30 years. Over this 30 year span, more than 13,500 tons of carbon are expected to be stored and 49,680 tonnes of CO2 equivalent to be removed from the atmosphere.