Patterned vegetation and rainfall intermittency

J Theor Biol. 2009 Feb 21;256(4):574-83. doi: 10.1016/j.jtbi.2008.10.020. Epub 2008 Nov 5.

Abstract

We study a mathematical model for the dynamics of patterned dryland vegetation in the presence of rainfall intermittency, adopting a spatially explicit approach. We find that most results found for constant precipitation carry over to the case of intermittent rainfall, with a few important novelties. For intermittent precipitation, the functional forms of the water uptake and consequently of the vegetation growth rate play an important role. Nonlinear, concave-up forms of water uptake as a function of soil moisture lead to a beneficial effect of rainfall intermittency, with a stronger effect when vegetation feedbacks are absent. The results obtained with the explicit-space model employed here are in keeping with those provided by simpler, implicit-space approaches, and provide a more complete view of vegetation dynamics in arid ecosystems.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biomass
  • Desert Climate
  • Ecosystem*
  • Models, Biological*
  • Plant Development*
  • Rain*
  • Seasons
  • Soil

Substances

  • Soil