Abstract:In order to explore the effects of soil water content on physiology characters of Pinus wangii seedlings, the antioxidant activities in pine needles were studied under different soil moisture. The results showed that the activities of POD, SOD, CAT were high under 40%-80% of field capacity. With prolong of time, the permeability of cell plasma membrane reduced, and stress resistance weakened. The contents of proline, soluble sugar and soluble protein were high under 20%-40% of field capacity. Malondialdehyde (MDA) content was gradually increased with the increment of soil water content for 30 d. When soil water content was 40% of field capacity, MDA content was the lowest and stress resistance of seedlings was the strongest. Therefore, the survival of seedlings could be improved under 30%-50% of field capacity, and the seedlings grown in too much soil water did not over 30 days.