The problem of environment protection is closely allied to tolerance of natural and anthropogenic ecosystems and landscapes for pollution and influence of other unfavourable factors, connected with human activity. In theoretical and applied aspects three questions are the most important to us: a) studying of the main compensational mechanisms of the damage effect overcoming by ecosystem; b) evaluation of condition and reserves of ecosystem buffering capacity in order to set norms of the technogenic pressure limit level; c) increasing ecosystem stability to anthropogenic stress methods working out.