Effects of conversion of native cerrado vegetation to pasture on soil hydro-physical properties, evapotranspiration and streamflow on the Amazonian agricultural frontier

PLoS One. 2017 Jun 13;12(6):e0179414. doi: 10.1371/journal.pone.0179414. eCollection 2017.

Abstract

Understanding the impacts of land-use change on landscape-hydrological dynamics is one of the main challenges in the Northern Brazilian Cerrado biome, where the Amazon agricultural frontier is located. Motivated by the gap in literature assessing these impacts, we characterized the soil hydro-physical properties and quantified surface water fluxes from catchments under contrasting land-use in this region. We used data from field measurements in two headwater micro-catchments with similar physical characteristics and different land use, i.e. cerrado sensu stricto vegetation and pasture for extensive cattle ranching. We determined hydraulic and physical properties of the soils, applied ground-based remote sensing techniques to estimate evapotranspiration, and monitored streamflow from October 2012 to September 2014. Our results show significant differences in soil hydro-physical properties between the catchments, with greater bulk density and smaller total porosity in the pasture catchment. We found that evapotranspiration is smaller in the pasture (639 ± 31% mm yr-1) than in the cerrado catchment (1,004 ± 24% mm yr-1), and that streamflow from the pasture catchment is greater with runoff coefficients of 0.40 for the pasture and 0.27 for the cerrado catchment. Overall, our results confirm that conversion of cerrado vegetation to pasture causes soil hydro-physical properties deterioration, reduction in evapotranspiration reduction, and increased streamflow.

MeSH terms

  • Agriculture / methods*
  • Agriculture / trends
  • Algorithms
  • Animals
  • Brazil
  • Cattle
  • Ecosystem
  • Geography
  • Hydrodynamics
  • Models, Theoretical
  • Plant Transpiration
  • Plants / metabolism*
  • Rivers
  • Soil / chemistry*
  • Time Factors
  • Water / metabolism*
  • Water Movements

Substances

  • Soil
  • Water

Grants and funding

This research was feasible thanks to the support of the Bundesministerin für Bildung und Forschung (www.bmbf.de) through its grant to GG (CarBioCial project, grant number: 01LL0902A). The authors also acknowledge the financial support of the Fundação de Amparo à Pesquisa do Estado de Mato Grosso (www.fapemat.mt.gov.br; grant number: 335908/2012) and the Brazilian National Council for Scientific and Technological Development (www.cnpq.br; grant number: 481990/2013-5) to RSSA, the German Research Foundation and the Open Access Publication Funds of the Göttingen University to RLBN, and the German Academic Exchange Service (DAAD) and CAPES for the financial support to RLBN and GNT, respectively. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.