Introduction

Abstract

Forests are the end stages of a development of natural vegetation and they maintain themselves even in the face of human interference (Ellenberg 1978). Forestry, more than any other form of land use, basically and all but exclusively, rests on natural processes. The fundamental structural and operational relationships recognizable in natural forests go back to the same principles that apply to forestry plantations (Brünig 1981). Therefore, in any type of forest utilization, enough attention should be paid to incorporating of natural processes in forest management practice.