Resumo

HERNANDEZ FLORES, María de la Luz et al. Influence of urbanization on the change in the vegetation adjoining the Pachuca-Tizayuca corridor (2000-2014). Rev. mex. de cienc. forestales [online]. 2016, vol.7, n.33, pp.20-39. ISSN 2007-1132.

Urban areas exert pressure over the adjoining vegetation. It has been demonstrated that the difference between vegetation indices (ΔVI) is a good indicator of its deterioration; however, no methodology quantifying its impact has been established. This strategy was applied in the main municipalities of the Pachuca-Tizayuca Valley, where urbanization experiences greater growths. The supervised classification was obtained in the years 2000 and 2014 through geographical information systems (GIS) and Landsat images (> 80 % reliability). The change of use of the soil (NU) to urban (U) was determined using the U/NU ratios and comparing them with the ΔVI between the two years. The NDVI, MSAVI, SAVI and TSAVI indices and the rural AGEBs were utilized as geographical analysis units. A distance raster file was generated for every pixel at the edge of the nearest urban areas (DU). The linear correlation of DU was determined using the ΔVI based on the bivariate spatial regression in IDRISI-Taiga software. The AGEBs with growing urbanization were identified by the higher values of the U/NU ratio; the ΔVIs were also observed to have higher values. DU was shown to have more correlation with ΔVI in the AGEBs with human settlements of intermediate expanse (R2 of 0.1 to 0.33). And the spatial correlation of ΔVI vs. DU has been equally proven to be a good methodological strategy for estimating the impact of urban pressure on the vegetation adjoining human settlements.

Palavras-chave : Basic geographic area; human settlements; change in land use; spatial correlation; vegetation index; urban pressure.

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