A commonly used term in connection with the development of natural forests, where direct human intervention has been stopped, is the concept of spontaneous development. This term describes the undisturbed development of natural forests where direct and indirect human influences are removed or forbidden. Especially the indirect influence of humans affects almost all of today’s forests in various ways and at varying intensities and it is difficult to classify these influences in any way. To describe the development of forests where direct human influences (especially renewal planting and forest tending) are forbidden it is more appropriate to use the term “spontaneous development”. This includes the spontaneous effects of natural forces in the relationship between individual elements in the geobiocenosis in the forest, as well as a certain degree of human influence on the forest stands in the past and also indirect human influences on the forest stands in the present day (e.g. excessively high deer populations or the remaining effects of air pollution – immission load etc.). For example, “natural development” does not describe the situation where the dynamics of forest development (even if it is a “natural” forest) are notably disturbed by very high deer populations which completely block the natural renewal of the forest. This is because the high deer populations are a result of human activity!
(Vrška, Hort, 2002)