Vibrational resonance in groundwater-dependent plant ecosystems

TL;DR

This paper investigates vibrational resonance phenomena in groundwater-dependent plant ecosystems models, revealing multiple resonance mechanisms influenced by water table oscillations and system parameters, with implications for ecosystem response dynamics.

Contribution

It introduces the first analysis of vibrational resonance in plant ecosystems models with biharmonic water table oscillations, highlighting multiple resonance mechanisms and parameter sensitivities.

Findings

Resonance occurs at both low and high frequencies of water table oscillations.

Multiple resonance peaks are observed with different underlying mechanisms.

Response amplitude is sensitive to system parameters like time-delay  and oscillation amplitude.

Abstract

We report the phenomenon of vibrational resonance in a single species and a two species models of groundwater-dependent plant ecosystems with a biharmonic oscillation (with two widely different frequencies \omega and \Omega, \Omega >> \omega) of the water table depth. In these two systems, the response amplitude of the species biomass shows multiple resonances with different mechanisms. The resonance occurs at both low- and high-frequencies of the biharmonic force. In the single species bistable system, the resonance occurs at discrete values of the amplitude g of the high-frequency component of the water table. Furthermore, the best synchronization of biomass and its carrying capacity with the biharmonic force occurs at the resonance. In the two species excitable and time-delay model, the response amplitude (Q) profile shows several plateau regions of resonance, where the period of evolution of the species biomass remains the same and the value of Q is inversely proportional to it. The response amplitude is highly sensitive to the time-delay parameter \tau and shows two distinct sequences of resonance intervals with a decreasing amplitude with \tau.