Space-time variability of the Roncador river basin in the change of land use and cover and its correlation with climatic variables

Authors

  • Raquel de Oliveira Santos Universidade Federal Rural do Rio de Janeiro
  • Rafael Coll Delgado Universidade Federal Rural do Rio de Janeiro
  • Marcos Gervasio Pereira Universidade Federal do Acre
  • Leonardo Paula de Souza Universidade Federal do Mato Grosso do Sul
  • Paulo Eduardo Teodoro Universidade do Estado do Mato Grosso
  • Carlos Antonio da Silva Junior Universidade do Estado do Mato Grosso
  • Giovani Glaucio de Oliveira Costa Universidade Federal Rural do Rio de Janeiro

DOI:

https://doi.org/10.14393/BJ-v35n4a2019-39486

Keywords:

landscape change, water availability, environmental disasters, image processing.

Abstract

The objective of this study was to evaluate the space-time dynamics of the soil use and occupation of the Rio Roncador river basin between 1985 and 2010. The scenes were classified by two methods (partially unsupervised - K-Means and supervised - Maximum likelihood), the Thematic Mapper sensor products on the LANDSAT 5 orbital platform were used for both images of a 25-year time series (1985 to 2000). In order to measure the accuracy of the field the computer application Google Earth was used, in which nine classes (urban area, agricultural area, pasture, exposed soil, native forest, secondary vegetation, mangrove, altitude field and water) were collected. A multiple linear regression was performed, correlating the Normalized Difference Vegetation Index - mean NDVI (dependent variable) with the independent climatic variables (global solar radiation - MJm-2day-1, average air temperature - °C, relative humidity -%, evapotranspiration - mm d-1, and rain - mm). According to the general classification by Kappa parameter of the images for 2005 and 2010, they were identified as very good (68% and 74%). These results confirm that the Roncador River Basin is undergoing transformation in its landscape, with an average reduction of -49% in native vegetation areas due to the increase in urban areas (25%) and agriculture (31%). The statistical analysis showed that rainfall and air temperature were the only variables that presented significant sigma (0.04) and (0.02). The obtained coefficient of determination indicated that 47% of the variations of the "vegetation index" are explained by the environmental variables.

 

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Published

2019-08-08

How to Cite

SANTOS, R. de O., DELGADO, R.C., PEREIRA, M.G., SOUZA, L.P. de ., TEODORO, P.E., SILVA JUNIOR, C.A. da and COSTA, G.G. de O.., 2019. Space-time variability of the Roncador river basin in the change of land use and cover and its correlation with climatic variables. Bioscience Journal [online], vol. 35, no. 4, pp. 1033–1042. [Accessed6 December 2022]. DOI 10.14393/BJ-v35n4a2019-39486. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/39486.

Issue

Section

Agricultural Sciences