Abstract: Light responsive curve models have been widely used in plant physiological studies. However, most of the researchers emphasize their study aims, ignoring the practicability of the used models to their special plant materials. In this paper, 7 different light responsive curve models were compared to investigate the fitted effects using birch(Betula platyphylla Suk.) and larch(Larix gemelinii(Rupr.)Rupr.). The fitted results using the different models for the same species were different. Furthermore, the fitted results using the same model for the leaves of different parts of the same species were different also. These results indicated that it is necessary to consider the practicability when a model is used to a selected plant species and the optimal model is essential to ensure the accuracy of the estimated physiological parameters.

Key words: light response curve, light response model, Larix gemelinii, Betula platyphylla