SOIL SHRINKAGE CURVES AND MICROMORPHOLOGY IN CONTRASTING MANAGEMENTS

Autores/as

  • Patricia Lilia Fernandez Facultad de Agronomía-Universidad de Buenos Aires CONICET
  • Carina Rosa Alvarez Facultad de Agronomía-Universidad de Buenos Aires
  • Filipe Behrends Kraemer Facultad de Agronomía-Universidad de Buenos Aires CONICET
  • Héctor José María Morrás Instituto de Suelos, Instituto de Suelos, Centro Nacional de Investigaciones Agropecuarias, INTA Castelar
  • Javier Scheiner EI Purpan - EcoLab, Université de Toulouse, CNRS, Toulouse, France
  • Pascal Boivin Haute école du paysage d’ingénierie et d’architecture de Géneve
  • Miguel Angel Taboada Instituto de Suelos, Instituto de Suelos, Centro Nacional de Investigaciones Agropecuarias, INTA Castelar CONICET

Palabras clave:

compaction, XP model, soil porosity, thin section

Resumen

Compaction processes are generally described using methods that do not distinguish volume changes of different types and pore sizes. The adjustment of shrinkage curves (ShC) using the XP model allows elucidation of the effects of soil management on changes in pore volume. This method coupled with micromorphological and micromorphometric determinations in soil thin sections allows the characterization and quantification of important soil features included pore types. The aim of this work was to examine the potential of shrinkage analysis to describe soil physical degradation under the most common management (continuous cropping-CC), an alternative management (integrated crop/livestock-ICL), related to quasi-pristine (QP); in two soils of northern of the Pampean region of Argentina (Typic Hapludoll and Typic Argiudoll). We focused on the changes of soil structural porosity in both methods (ShC and micromorphological analyses) in silty soils with low shrinkage-swelling capacity. The QP had a higher volume (or lower bulk density) in both soils. The slope of the structural phase was QP<ICL<CC, indicating lower structural stability, as a consequence of macropore destruction due to management intensity. Micromorphological analyses were in concordance to shrinkage analysis. QP showed higher structural pores from shrinkage analyses; and from micromorphometric analyses: higher Pores>50 um, a good pore orientation (vertical angles), and crumb microstructure derived from an intense biological activity were observed. In Typic Hapludoll, structural porosity in CC and ICL presented similar values according to ShC determinations. In Typic Argiudoll CC it was presented a lower values of structural porosity than in ICL. Similar results were estimated from micromorphological analyses (Pores>50 µm = QP(20.0%)>ICL(17.7%)>CC(16.0%)). CC and ICL were characterized by the development of platy peds and horizontally oriented planes, whereas ICL presented more biological activity. ShC and micromorphology analyses improved the understanding of soil functioning in these non-expansive soils, allowing the comparison between cattle trampling and continuous cropping in different soil types.

Biografía del autor/a

Patricia Lilia Fernandez, Facultad de Agronomía-Universidad de Buenos Aires CONICET

  • Ingeniera Agrónoma (FAUBA, 2005)
  • Doctora en Ciencias Agropecuaria (FAUBA, 2011)
  • Jefe de Trabajos Prácticos, Cátedra de Fertilidad y Fertilizantes, Departamento de Ingeniería Agrícola y Uso de la Tierra, FAUBA.

Descargas

Publicado

29-05-2020

Cómo citar

Fernandez, P. L., Alvarez, C. R., Behrends Kraemer, F., Morrás, H. J. M., Scheiner, J., Boivin, P., & Taboada, M. A. (2020). SOIL SHRINKAGE CURVES AND MICROMORPHOLOGY IN CONTRASTING MANAGEMENTS. Ciencia Del Suelo, 38(1). Recuperado a partir de https://ojs.suelos.org.ar/index.php/cds/article/view/526

Número

Sección

Física, Química y Físico-química de los Suelos