Assessment of the Resilience of Altered Permanent Preservation Areas (App's) from the Occurrence of Precipitation Variations

  • G. B. Souza
  • A. B. M. Rodrigues
  • N. N. Giuliatti
  • A. Pereira Júnior


The urban expansion that assails water bodies in a disorderly way receives environmental impacts that are aggravated when floods and floods occur. The objective of this research was to analyze the changes in vegetation and soil chemistry in 36,000 m2 (A1, A2 and A3, with 12,000 m2 each) in the Environmental Protection Areas of the Uraim and Paragominas rivers, southeast Pará. The method used was the deductive one, with quantitative and qualitative scope, of nature applied. The pluviometric data were obtained from the National Water Agency link, from April 2018 (flooding) to March 2019 (flooding). The data obtained were treated statistically as BiosEstat 5.0 software use. The loss of vegetation cover was calculated using the Visible Atmosphericaly Resistat Index with the aid of Unmanned Aerial Vehicle, then the maps were prepared using the electronic tools available in MAPPA Agriculture drone Analysis and Quantum Gis.Soil sampling was performed both in dry and rainy periods in accordance with the Pedology Manual of the Brazilian Institute of Geography and Statistics and the application of the Soil Quality Assessment Index. The analysis of the data obtained indicated that the 2018 flood did not occur only from climatic factors such as La Niña but worsened due to the rupture of dams, the flooding was due to high rainfall rates (March,  = 570.0 mm) and may occur again. For the VARI, the data indicated that there was a high alteration in vegetation in Area 1 in different spectral ranges (Q1= 0, 0029%; Q2 = 0,0043%, more intense; Q3 (31,95%) and Q4 (20,79%) less intense, areas with scarce and sparse vegetation coverage and with Housing Units located between 03 and 10 m from the banks. As for IQAS, four quadrants four of them were above the average (  = 0.3962), as occurred in: A01Q04,   = 0.6323; A0Q01,  = 0.5669; A02Q03,  = 0.5285 and A02Q02  = 0.4806.  Therefore, the alterations in soil chemistry were classified as "low to medium", which is essential for the recomposition of the riparian forest, therefore, it is suggested the isolation of the affected areas, with the planting of native seedlings, and obedience to the marginal vertical radius of 30 m stipulated in the Brazilian Forest Code.Key words: Climate Change, Forest Code, Urban sprawl