Grey Analysis of Natural Regeneration of Mixed Coniferous and Broadleaf Stands of Spruce and Fir

Many factors affect natural regeneration in mixed coniferous and broad-leaved stands of spruce and fir. This paper applies gray incidence theory to analyzing the influence factors of natural regeneration. The results of importance in demotion are altitude, volume, tree number, crown density, gradient, thickness of humus, number of conifers, percentage of the volume of conifers. The volume gets a high score in controlled factors, which puts up a principal importance. Next factors in turn are tree number, crown density, number of conifers, and percentage of the volume of conifers.