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Artículo

Least limiting water range: A potential indicator of changes in near-surface soil physical quality after the conversion of Brazilian Savanna into pasture

Leão, Tairone Paiva; Da Silva, Álvaro Pires Da; Macedo, Manuel Cláudio Motta; Imhoff, Silvia del CarmenIcon ; Euclides, Valẽria Pacheco Batista
Fecha de publicación: 07/2006
Editorial: Elsevier Science
Revista: Soil & Tillage Research
ISSN: 0167-1987
Idioma: Inglés
Tipo de recurso: Artículo publicado

Resumen

The Brazilian savanna, or "Cerrado", is an ecosystem that originally covered more than 200 Mha in Brazil. It is estimated that about 49.5 Mha in the Cerrado are now covered with cultivated pastures, which are responsible for half of Brazilian beef production. However, soil and pasture degradation represent a threat to this productive system and to the Cerrado ecosystem itself. Thus, the objective of this research was to evaluate the least limiting water range (LLWR) as an index of near-surface soil physical quality after conversion of Brazilian savanna to continuous and short-duration grazing systems. Three sites were evaluated: native Cerrado (NC), continuous grazing (CG), and short-duration grazing (SG). Thirty soil cores (5 cm height, 5 cm diameter) were collected at each site, and used for soil bulk density, soil water retention curve, and soil penetration resistance curve determinations. The results were used for quantification of LLWR and critical bulk density (Dbc), in which LLWR equals zero. The near-surface soil physical quality, as evaluated by the LLWR, was most restrictive for potential root growth in SG. In CG, potential restriction was moderate; however, the entire soil bulk density range was below the Dbc. In NC, potential restriction was minimum. The soil structural degradation process was primarily related to the increase in stocking rates in the grazing systems. The LLWR proved to be a useful indicator of Cerrado soil physical quality, being sensitive to alterations in near-surface physical properties.
Palabras clave: CERRADO , CONTINUOUS GRAZING , CRITICAL BULK DENSITY , LEAST LIMITING WATER RANGE , SHORT-DURATION GRAZING , TROPICAL GRASS
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
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URI: http://hdl.handle.net/11336/84780
DOI: http://dx.doi.org/10.1016/j.still.2005.06.014
URL: https://www.sciencedirect.com/science/article/pii/S0167198705001844
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Articulos(IAL) [312]
Articulos de INSTITUTO DE AGROBIOTECNOLOGIA DEL LITORAL
Citación
Leão, Tairone Paiva; Da Silva, Álvaro Pires Da; Macedo, Manuel Cláudio Motta; Imhoff, Silvia del Carmen; Euclides, Valẽria Pacheco Batista; Least limiting water range: A potential indicator of changes in near-surface soil physical quality after the conversion of Brazilian Savanna into pasture; Elsevier Science; Soil & Tillage Research; 88; 1-2; 7-2006; 279-285
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