Utilização de P-Index em uma bacia hidrográfica através de técnicas de geoprocessamento

Translated title of the contribution: Use of P-Index in a waterbasin by geoprocessing techniques

Fabíola Lopes, Gustavo H. Merten, Melissa Franzen, Elvio Giasson, Fernanda Helfer, Luis F A Cybis

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Due to problems caused by eutrophication of lakes and reservoirs, the identification of phosphorus source areas is important for planning the control of agriculture-related water pollution. This study applied a method designed to identify these phosphorus source areas, called P-Index, which is based on combining data layers related to soil phosphorus availability and phosphorus transport processes. The method was used for studying the Salto Reservoir waterbasin, in São Francisco de Paula, in the State of Rio Grande do Sul, Brazil. Data related to phosphorus availability, intensity of transport processes, and distance to waterways were combined to yield a map of phosphorus contribution classes, which showed that almost the entire study area was considered to have low phosphorus contribution potential. A few small areas, corresponding to potato and garlic fields that received heavy chemical fertilization, were classified as having high phosphorus contribution potentials.

Translated title of the contributionUse of P-Index in a waterbasin by geoprocessing techniques
Original languagePortuguese
Pages (from-to)312-317
Number of pages6
JournalRevista Brasileira de Engenharia Agricola e Ambiental
Issue number3
StatePublished - Jun 2007


  • Eutrofication
  • Geographic information system
  • Land use


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