Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

SOIL-DEPENDENT FIRE FREQUENCY: A NEW HYPOTHESIS FOR THE DISTRIBUTION OF PRAIRIES AND OAK WOODLANDS/SAVANNAS IN NORTH CENTRAL AND EAST TEXAS

George M. Diggs, Jr. and Peter C. Schulze
SIDA, Contributions to Botany
Vol. 20, No. 3 (29 July 2003), pp. 1139-1153
Stable URL: http://www.jstor.org/stable/41968154
Page Count: 15
  • Read Online (Free)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
SOIL-DEPENDENT FIRE FREQUENCY: A NEW HYPOTHESIS FOR THE DISTRIBUTION OF PRAIRIES AND OAK WOODLANDS/SAVANNAS IN NORTH CENTRAL AND EAST TEXAS
Preview not available

Abstract

The distinctive historical vegetation pattern of alternating tallgrass prairies on clay soils and oak woodlands/savannas on sandy soils in North Central Texas and East Texas has been described for more than a century. Many authors have attributed this pattern to relatively high levels of soil moisture available for tree growth on areas of sandy soil, and conversely, inadequate levels of soil moisture for tree growth on clay soils. However, this explanation is not consistent with present day observations of rapid invasion of clay soils by woody vegetation. We propose an alternative hypothesis, that the historical distribution of prairies and woodlands in North Central and East Texas can be explained by soil-dependent variations in grass biomass and resulting differences in fire frequency and intensity. El patrón histórico de vegetación en el que alternan praderas con hierbas altas en suelos calcáreos y robledales / sabana en suelos arenosos en el centro-norte y este de Texas ha sido descrito durante más de un siglo. Muchos autores han atribuido este patrón a los niveles relativamente altos de humedad en el suelo disponible para el crecimiento de los árboles en áreas de suelo arenoso, y por el contrario, niveles inadecuados de humedad en el suelo para el crecimiento de árboles en suelos calcáreos. Sin embargo, esta explicación no es consistente con las observaciones actuales de invasión rápida de suelos calcáreos por vegetación arbórea. Proponemos una hipótesis alternativa, que la distribución histórica de las praderas y bosques en el centro-norte y este de Texas puede ser explicada por las variaciones dependientes del suelo en la biomasa de las gramíneas y las diferencias resultantes en la frecuencia e intensidad del fuego.

Page Thumbnails

  • Thumbnail: Page 
[1139]
    [1139]
  • Thumbnail: Page 
1140
    1140
  • Thumbnail: Page 
1141
    1141
  • Thumbnail: Page 
1142
    1142
  • Thumbnail: Page 
1143
    1143
  • Thumbnail: Page 
1144
    1144
  • Thumbnail: Page 
1145
    1145
  • Thumbnail: Page 
1146
    1146
  • Thumbnail: Page 
1147
    1147
  • Thumbnail: Page 
1148
    1148
  • Thumbnail: Page 
1149
    1149
  • Thumbnail: Page 
1150
    1150
  • Thumbnail: Page 
1151
    1151
  • Thumbnail: Page 
1152
    1152
  • Thumbnail: Page 
1153
    1153