What is the difference between the concepts of ecosystem and biogeocenosis?

A biogeocenosis is a homogeneous area of ​​the earth’s surface with a certain composition of living organisms (biocenosis) and certain environmental conditions (biotope), which are united by the metabolism and energy into a single natural complex. In many countries of the world, such natural complexes are called ecological systems (ecosystems).
Biogeocenosis and ecosystem are similar concepts, but not the same. The concept of “ecosystem” has no rank and dimension, so it is applicable both to simple (anthill, rotting stump) and artificial (aquarium, reservoir, park), and to complex natural complexes of organisms with their habitat. A biogeocenosis differs from an ecosystem in a certain volume. If an ecosystem can cover an area of ​​any length, from a drop of pond water with microorganisms contained in it to the biosphere as a whole, then a biogeocenosis is an ecosystem whose boundaries are determined by the nature of the vegetation cover, i.e., phytocenosis. Consequently, any biogeocenosis is an ecosystem, but not every ecosystem is a biogeocenosis.