2026-04-14T02:18:28Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/3462182025-07-22T16:49:36Zcom_2072_1033col_2072_452951

00925njm 22002777a 4500 dc Pla Mauri, Jordi author 2021-05 Understanding the causes and effects of spatial vegetation patterns in semi-arid ecosystems is a fundamental problem in ecology, especially because these can be used as early predictors for catastrophic shifts such as desertification. Empirical studies of the vegetation cover in some areas such as drylands and semi-arid regions have revealed the existence of vegetation patches of broadly diverse sizes. Different explanatory mechanisms, such as plant-plant interactions and plant-water feedback loops have been proposed to rationalize the emergence of such patterns, yet a full understanding has not been reached. Using a stochastic model for vegetation and water dynamics, we show that emergence of vegetation patches with broadly distributed sizes are promoted in a robust way depending on the stochastic pressure. From a practical viewpoint, this may be of importance to characterize real data gathered using remote sensing and predict the effects that changes in environmental conditions may have in real ecosystems. Àrees temàtiques de la UPC::Matemàtiques i estadística::Equacions diferencials i integrals::Sistemes dinàmics Differentiable dynamical systems Dynamical systems Drylands Noise-induced phenomena Spatial patterns Stochastic differential equations Wiener process Sistemes dinàmics diferenciables Classificació AMS::37 Dynamical systems and ergodic theory::37H Random dynamical systems Unifying Deterministic and Stochastic Models in Drylands