THE PRELIMINARILY INVESTIGATION ON THE VERTICAL DISTRIBUTION OF THE FOREST VEGETATION ON HUALONGSHAN MOUNTAIN,SHAANXI PROVINCE
陕西省化龙山森林植被垂直分布的初步研究

In this paper, the characteristics of the vertical distribution of the forest vegetation on Hualongshan Mountain was discussed. According to the altitudinal distribution of main woody-plant communities, using the methods of quantitative classification and the analysis combining the ecological physiognomy and floristic composition of various altitude, three vertical zones of forest vegetation may be identified:1. The evergreen and deciduous broad-leaf mixed forest zone below 1600m.2. The deciduous broad-leaf forest zone (1600-2200m).3. The submountain coniferous forest zone (2200-2917m).