Abstract: In order to explore the photosynthetic characteristics of eremophytes in Jinchuan Mining area, the photosynthesis-light responses of Arnebia szechenyi, Halogeton glomeratus and Salsola arbuscula were measured with Li-6400XT portable photosynthesis system, and then the fitting analysis was carried out to improve the accuracy of photosynthetic response curve fitting and investigate the three species photosynthetic physiological characteristics. The results showed that the different models had great differences in fitting results of light response curve of the same plant, and the same model had also obvious differences in fitting results of the different species; the orthogonal hyperbolic correction was the optimal model for the fitting effect of the Arnebia szechenyi and Salsola arbuscula, while the non-orthogonal hyperbolic model was the best model for the fitting result of the Halogeton glomeratus; the Arnebia szechenyi had the greatest photosynthetic capacity, followed by Salsola arbuscula and Halogeton glomeratus.

Key words: Arnebia szechenyi, Halogeton glomeratus, Salsola arbuscula, light response, optimal fitting model