The Positive Correlations Between the Activity of Superoxide Dismutase and Dehydration Tolerance in Wheat Seedlings Correlation Between Lipid Preoxidation Damage and Ultrastructural Changes of Mesophyll Cells in Barley and Wheat Seedlings During Salt Stress Allelopathic Effects of Aqueous Extracts of Legumes on Italian Ryegrass THE EFFECT OF ENHANCED UV B RADIATION ON THE ACTIVITIES OF SOD,CAT AND POX IN WHEAT LEAVES 常绿阔叶园林6树种(品种)对模拟酸雨的生理响应及敏感性 常绿阔叶园林6树种(品种)对模拟酸雨的生理响应及敏感性