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 and ecosystems. (c) 2008 Elsevier Ltd. All rights reserved.
Patterned vegetation and rainfall intermittency / Kletter, A. Y.; von Hardenberg, J.; Meron, E.; Provenzale, A.. - In: JOURNAL OF THEORETICAL BIOLOGY. - ISSN 0022-5193. - 256:4(2009), pp. 574-583. [10.1016/j.jtbi.2008.10.020]
|Titolo:||Patterned vegetation and rainfall intermittency|
|Data di pubblicazione:||2009|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.jtbi.2008.10.020|
|Appare nelle tipologie:||1.1 Articolo in rivista|