Abstract: The low temperature injury index of Zizyphus mauritiana Lam. in seeding stage was explored in environmental climate chambers under seven low temperature conditions of -4, -3, -2, -1, 0, 1 and 2 ℃, and three duration levels of 1, 2 and 3 d for each condition. Morphology change and recovery situation of Z. mauritiana were observed after low temperature treatment. Moreover, five geographical displacements were conducted to observe Z. mauritiana morphology change and recover situation under different low temperature conditions. The result shows that the Z. mauritiana seedlings suffered damage when it was below -2 ℃, indicating that -2 ℃ was the threshold value of suffering damage at low temperature. When it was below -4 ℃, the mortality rate of Z. mauritiana reached 67%, indicating -4 ℃ was the death indicator at low temperature. The minimum temperature of above 0 ℃ in winter did not harm the tree body, flowers and fruits. Leaf cast was caused by dramatic weather changes for days. The results suggest that Z. mauritiana trees feature stronger endurance of cold weather than they do in Taiwan, providing a scientific basis for management and chill injury defense of Z. mauritiana in seedling stage.

Key words: net primary productivity, collaborative application, gross primary productivity, BEPS, parameter optimization