Abstract: Effects of soil conditions on the growth and physiological characteristics of Qing-nai（P. salicina Lindl. var. cordata J. Y. Zhang et al.）were studied in the experiment, aiming at understanding the suitability of Qing-nai to different soil conditions. Single leaf area, trunk diameter, total shoot growth increment, the longest single shoot length per plant, MDA, Pro and soluble sugar contents in leaves and activity of POD and SOD were determined and analyzed after treatment. The results show that the values of leaf area, truck diameters, total shoot growth increment and the longest single shoot length of the plants grown in sandy loam were very significantly higher than those grown in clay loam. MDA content, soluble sugar content and activity of POD in the leaves of plants grown in the clay loam were very significantly higher than those grown in the sandy loam, and activity of SOD was significantly higher exclusively. There was no significant difference between the two distinctive soil conditions in the respect of Pro content. A conclusion could be drawn from the examined indexes and the plant growth status in field that permeable sandy loam with proper fertilizer is more suitable for the growth of Qing-nai.

Key words: P. salicina Lindl. var. cordata J. Y. Zhang et al., soil condition, growth increment, MDA, Pro, SOD, POD, soluble sugar