A dynamical systems framework for crop models: Toward optimal fertilization and irrigation strategies under climatic variability

摘要

Highlights?Crop models are not typically examined in a dynamical systems framework.?A simple crop model to explore this framework is proposed.?Results highlight the importance of resource limitation thresholds for optimality.?Optimal strategies must also be robust to random hydroclimatic forcing.AbstractCrop models are widely used for the modeling and prediction of crop yields, as decision support tools, and to develop research questions. Though typically constructed as a set of dynamical equations, crop models are not often analyzed from a specifically dynamical systems point of view, despite its potential to elucidate the roles of feedbacks and internal and external forcings on system stability and the optimization of control protocols (e.g., irrigation and fertilization). Here we develop a minimal dynamical system, based in part on the widely known AquaCrop model, consisting of a set of ordinary d