Abstract.

A mathematical problem . The paper discusses the problem of joint use of population-based and mass-energy approaches in modeling ecosystems. On the example of three tasks: modeling of vegetation dynamics under climate change; modeling the relationship between population dynamics and metabolism of the individuals; modeling of mobility of the population, discusses the problem of mathematical descriptions of environmental objects. The Central questions are: – is it sufficient to describe the ecological systems of typical variables-population size, number of species, concentration of biogenic elements, and whether their joint measurement is possible

Keywords:

population models the nutrient cycle, the size spectrum of the population, migration of individuals.

PP. 16-21.

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