Spatio-temporal pattern of cold and frost damage in China Climatological Study on Frost Damage of Winter Wheat in China Research on the disturbance of frost damage to forests Study on the integrated early mature and frost。avoiding cultivation techniques of cotton in Shanxi Province Application of chemical methods on frost disaster prevention Analysis of Frost Resistance of Paulownia Young Plantationunder Different Management Measures Relationship between Frost Damage and Leaf Temperature with Winter Wheat after J ointing Stage