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Abies georgei  var.  smithii  (Abies George I varsmithorr. II (Viguie et Gaussen) Cheng et l.) belongs to Abies of Pinaceae, which is distributed in the southeast of Tibet, southwest of Sichuan and northwest of Yunnan. In this study,  Abies georgei  var.  smithii  in Sejila Mountain of southeastern Tibet was studied, the contents of Malondialdehyde (MDA), proline (pro), hydrogen peroxide (H 2 O 2 ), soluble sugar and chlorophyll as well as the activities of superoxide dismutase (SOD) and superoxide dismutase (SOD) in the leaves, twigs, tree stems and roots of  Abies georgei  var.  smithii  were measured at different altitudes in the growing and non-growing seasons, single factor analysis of variance and multiple comparison were used to process the data. The results showed that the contents of Malondialdehyde (MDA), proline (pro) and hydrogen peroxide (H 2 O 2 ) in the roots of  Abies georgei  var.  smithii  were significantly higher than those of other tissues in both growing and non-growing seasons, the content of chlorophyll in the leaves increased at first and then decreased with the elevation gradient, on the contrary, the ratio of chlorophyll a/b (CHLA/CHLB) increased with the elevation gradient. The activities of Peroxidase (POD) and superoxide dismutase (SOD) were the lowest. When the altitude was more than 4300m, the activities of POD and SOD decreased. The results showed that the physiological resistance of  Abies georgei  var.  smithii  decreased when the elevation was over 3900m, which was not beneficial to the growth and development of  Abies georgei  var.  smithii , therefore, the distribution of  Abies georgei  var. smithii along the higher elevation gradient was limited by the unfavorable environmental factors at high altitude.

Spatio-temporal response mechanism of physiological characteristics of Abies georgei var. smithii to altitude