Phenomenological models of the forest plantations growth
1Center for the Forest Ecology and Productivity, RAS, ul. Profsoyuznya, 84/32,119997 Moscow e-mail: asi@cepl.rssi.ru 2 Sukachev's Forest Institute, SB RAS, Akademgorodok, 660036 Krasnoyarsk e-mail: Soukhovolsky@forest.akadem.ru
Phenomenological models of the forest plantations growth are analyzed. Those derived from the Verhulst's model are shown to fail describing qualitative effects reflecting tree growth, phytomass withdrawals, and plantation restoration. The method of phase portraits is used for exploration of the forest ecosystem dynamics, which allows to describe regulatory mechanisms of the growth processes, regulation delay, and feedback types. A bistable phenomenological model is suggested herewith to characterize dynamic processes in the forest ecosystems. Principal patterns of formation of the forest plantations at different stages of the forest generation processes are considered on the basis of that model, and ecological effects responsible for the plantation dynamics are revealed.
