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RESEARCH ARTICLE

Soil hydro-physical changes in natural grassland of southern Brazil subjected to burning management

E. S. Vogelmann A E , J. M. Reichert A , J. Prevedello B , C. A. P. de Barros A , F. L. F. de Quadros C and J. Mataix-Solera D
+ Author Affiliations
- Author Affiliations

A Department of Soil Science, Federal University of Santa Maria, Santa Maria, Brazil.

B Department of Forestry Engineering, Federal University of Santa Maria, Santa Maria, Brazil.

C Department of Zootechnic, Federal University of Santa Maria, Santa Maria, Brazil.

D Department of Agrochemical and Environment, University Miguel Hernández, Elche, Alicante, Spain.

E Corresponding author. Email: eduardovogelmann@hotmail.com

Soil Research 50(6) 465-472 https://doi.org/10.1071/SR12106
Submitted: 20 April 2012  Accepted: 5 July 2012   Published: 18 September 2012

Abstract

Burning of vegetation can promote changes in soil physical properties and also create hydrophobic substances, which accumulate and result in the formation of water-repellent layers. A study was conducted between 2005 and 2011 on an Albaqualf, with natural grassland composed mainly of Andropogon lateralis, in southern Brazil, to investigate the induction of hydrophobicity by burning and changes in the soil hydro-physical characteristics. The treatments consisted of no burning, and burned 60, 36, 12, 6, 4, and 2 months before sampling. Burning management did not change the saturated hydraulic conductivity, whereas air permeability was significantly reduced in the surface layer, nearly reaching the original values 4 months after burning. Saturated hydraulic conductivity and air permeability correlated with total porosity and macroporosity. The surface layer was the most sensitive to fire effects, with an increased degree of hydrophobicity for up to 2 months after vegetation burning. Hydrophobicity and contact angle correlated positively with soil organic matter content.

Additional keywords: air permeability, organic matter, saturated hydraulic conductivity, vegetation burning, water repellency.


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