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Corpus Systématique Végétale

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Shrubland encroachment in southern New Mexico, U.S.A.: An analysis of desertification processes in the American southwest

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  • Herbert D. Grover 1
  • H. Brad Musick 1
  • 1) Technology Application Center, University of New Mexico, 87131, Albuquerque, NM, USA

The area dominated by the shrubs creosotebush (Larrea tridentata) and mesquite (Prosopis glandulosa) in the American southwest has increased several-fold over the last century, with a corresponding decrease in areal coverage of productive grasslands and increased surface soil erosion throughout the region. The factors thought to be responsible for this regional shift in vegetation are: (1) overgrazing by domestic livestock; (2) fire suppression; and (3) historical changes in climate. We examine the evidence concerning each of these factors and develop a synthetic model outlining the principles affecting shrubland encroachment, which focuses on life history characteristics of the dominant shrubs and a number of positive biotic and edaphic feedback mechanisms contributing to their establishment and persistence. We conclude that the expansion of shrub dominance that has occurred over the last century may have been triggered by extreme live-stock overgrazing at the end of the nineteenth century, which coincided with rainfall regimes that were unfavorable for perennial grass growth. Hence, the landscape we observe today may be a product of positive feedback mechanisms triggered over a century ago by management practices that were uninformed with regard to the importance of historical climate patterns and the life history characteristics of important rangeland species. Our consideration of these issues also addresses potential land surface - climate interactions that could occur as a result of regional alterations in vegetation dominance and physiognomy.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - earth & environmental sciences
  • 3 - meteorology & atmospheric sciences
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - psychologie. psychophysiologie
Catégories Scopus
  • 1 - Physical Sciences ; 2 - Earth and Planetary Sciences ; 3 - Atmospheric Science
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - Global and Planetary Change
Catégories WoS
  • 1 - science ; 2 - meteorology & atmospheric sciences
  • 1 - science ; 2 - environmental sciences
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Climatic Change

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