Resumo

REYES-CARDENAS, Oscar et al. Aboveground biomass dynamics after a reforestation program in San Luis Potosí State. Rev. mex. de cienc. forestales [online]. 2017, vol.8, n.39, pp.45-58. ISSN 2007-1132.

The impact of the reforestation program implemented by Conafor in the Forest Management Region 2404 was determined. In order to carry out this analysis, the difference in the amount of above ground biomass existing in 2000, 2010 and 2015 was calculated. To calculate the biomass, a model was developed that relates satellite image information to that obtained in field samples. Landsat 5 TM images were used for the years 2000 and 2010 and Landsat 8 OLI for 2015. In these images, the normalized difference vegetation index (NDVI) was generated. Subsequently, the amount of biomass of the species recorded in 44 sample clusters of the National Forest and Soils Inventory was estimated using allometric equations. To determine the relationship between the data obtained between the two methods., the Pearson correlation coefficient (0.69, 0.65 and 0.64, for 2000, 2010 and 2015, respectively) was calculated. With these data, three types of models were tested: linear, exponential and second order polynomial for each year, selecting the polynomial to model the biomass in the three years. With the application of the model in the mosaics of images, it was obtained that from 2000 to 2015 there was an important increase both in the amount of biomass and in the area with vegetation. It is concluded that the reforestation program has had a positive impact on the region.

Palavras-chave : Spatial analyst; aboveground biomass; allometric equations; Landsat images; normalized difference vegetation index; forest national inventory.

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