Efecto de la densidad de pastoreo sobre la capacidad de soporte y funcionalidad del sistema poroso de un Andisol

Navarro, Gonzalo; Dec, Dorota; balocchi, Oscar; López, Ignacio; Clunes, John; Dörner, José

Keywords: Static load, Dinamyc load, Volcanic soil, Grazing intensity, Resilience


Grazing management is a dynamic process that affects both the plants and the soil that supports them. The objective of this work was to evaluate the effect of grazing density on the bearing capacity and the functionality of the porous system of a Duric Hapludand, analysing its recovery. Two grazing densities of 50 and 200 cows ha-1 were established on a natural pasture regenerated with Lolium perenne L. and Trifolium repens L. (20x20 m2 plots). In each experimental unit, disturbed and undisturbed soil samples (2 to 10 cm) were collected in different moments: 1 day before grazing, 1 day after the last grazing and after a lag period of 105 days without grazing. On the undisturbed and packed samples at the same bulk density, the bearing capacity (CS, at 6 kPa of tension) was determined with static loading test (CS_est) and cyclic loading test (CS_din). Additionally, the bulk density (da), air capacity (AC), air conductivity (Kl) and coefficient of linear extensibility (COLE) were determined. It was observed that continuous grazing affects the mechanical stability of the soil and the functionality of its pores. An increase in the grazing density during winter increases the CS value of the soil, being higher when calculated with CS_din. However, this relationship was not observed when analysing soil resilience. There were no critical values for the development of plant roots; however, it does not mean that these soils can endure stresses indefinitely.

Más información

Título de la Revista: Agro Sur
Volumen: 45
Editorial: Universidad Austral de Chile
Fecha de publicación: 2017
Página de inicio: 63
Página final: 73
Idioma: Español
URL: https://www.agrosur-journal.cl/2020/


Notas: Latindex, AGRIS, Cab Abstracts (CABI), Animal Science (CABI), AgBiotechNet (CABI), Environmental Impact (CABI), Forest Science (CABI), Horticultural Science (CABI), Nutrition and Food Sciences (CABI), VetMed Resource (CABI), Google Scholar, Base de Información Bibliográfica Agrícola Chilena (INIA), FSTA.