INVESTIGADORES
IMHOFF Silvia Del Carmen
artículos
Título:
Least Limiting Water Range: An Indicator of Soil Degradation after the Conversion of Brazilian Savanna into Pasture.
Autor/es:
LEÃO, T; DA SILVA, ALVARO PIRES; MACEDO, M.C.M.; IMHOFF, S.; EUCLIDES, VPB.
Revista:
SOIL & TILLAGE RESEARCH
Editorial:
Elsevier
Referencias:
Lugar: Bélgica; Año: 2006 vol. 88 p. 279 - 285
ISSN:
0167-1987
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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