Artículo
Soil Physical Changes after Conversion of Woodlands to Pastures in Dry Chaco Rangelands (Argentina)
Magliano, Patricio Nicolás
; Fernandez Alduncin, Roberto Javier
; Florio, Eva Laura
; Murray, Francisco; Jobbagy Gampel, Esteban Gabriel
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Fecha de publicación:
03/2017
Editorial:
Society for Range Management
Revista:
Rangeland Ecology and Management
ISSN:
1550-7424
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The conversion of dry woody rangelands into pastures can alter key soil physical properties that regulate ecosystem water circulation and storage. Based on three paired stands of native woodlands and pastures established 20 years ago in the southern Dry Chaco (San Luis, Argentina), we described contrasts in five soil physical properties using a systematic sampling of soil patches (9-18 patches along a single transect within each of the three paired 1-ha stands). Compared with woodlands, pastures displayed flatter microtopography (mean ± standard deviation [SD]: 3.7 ± 0.34 vs. 5.0 ± 0.67% slope; P < 0.05), lower infiltration rate (mean ± SD: 71.6 ± 9.0 vs. 139.9 ± 37.2 mm h-1; P < 0.05), and higher penetration resistance (mean ± SD: 4.2 ± 0.10 vs. 1.9 ± 0.17 kg cm-2; P < 0.01) and bulk density (mean ± SD: 1.39 ± 0.05 vs. 1.16 ± 0.04 g cm-3; P < 0.0001). On average, topsoil water content at field capacity was similar for both types of cover (mean ± SD: 16.3 ± 0.21 vs. 17.1 ± 1.12%, pastures and woodlands, respectively; P = 0.29). However, at similar bulk density values, pastures presented a ∼20% reduction in volumetric water content at field capacity (16.3%) compared with woodlands (19.7%). The establishment of pastures led to more homogenous soils, with most variables having reduced spatial variability in comparison with woodlands. Our observations showed how the conversion of native woodlands to pastures produced strong physical changes in the soils of Dry Chaco and help to understand the mechanisms that are most likely influencing the surface-soil water dynamics of these, and perhaps other, dry rangelands.
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Articulos(IMASL)
Articulos de INST. DE MATEMATICA APLICADA DE SAN LUIS
Articulos de INST. DE MATEMATICA APLICADA DE SAN LUIS
Citación
Magliano, Patricio Nicolás; Fernandez Alduncin, Roberto Javier; Florio, Eva Laura; Murray, Francisco; Jobbagy Gampel, Esteban Gabriel; Soil Physical Changes after Conversion of Woodlands to Pastures in Dry Chaco Rangelands (Argentina); Society for Range Management; Rangeland Ecology and Management; 70; 2; 3-2017; 225-229
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