Based on the proposed structures of the consortium of protected type ecotones, mathematical model of tree diameter growth has been developed. It allows predict the index of the state. The status index of the last is one of the important parameters of the quality of forest plantations functioning. Quality indexes of CPTE functioning on the basis of the conducted experimental studies are specified and the criteria of their gradation are formulated. Consideration is fulfilled by evaluating the obtained results and taking into account the major physical and chemical parameters.