关键词: 高寒草甸, 光响应曲线, 拟合模型, 酸模, 金露梅, 野草莓

Abstract:

In order to study the application of the light response models to the lanceolate leaves of different plants and the adaptability of different plants to the local environment, four different light response models were used to fitting analysis for Potentilla fruticosa L., Fragaria vesca and Rumex acetosa L. The results showed that the photosynthetic photoresponse curves of the four kinds of plants could be fitted to the three plant leaves, and the coefficient of determination was R² > 0.99. Modified rectangular hyperbola model fitted the best results of the three different lanceolate leaves, and the calculated light saturation point, maximum net photosynthetic rate and light compensation point were closest to the measured values. It is speculated that modified rectangular hyperbola model may be applied to the fitting of the lanceolate leaf. The Rumex acetosa L. has a higher light saturation point (2 389.806 μmol·m^-2·s^-1) and a lower light compensation point (21.943 μmol·m^-2·s^-1); both Rumex acetosa L. and Potentilla fruticosa L. have a higher initial value quantum efficiency (0.088, 0.063), which have a high conversion efficiency for light energy; Fragaria vesca has the lowest rate of dark respiration, as well as the consumption of photosynthetic product. The best fitting models for the three plant leaves are the modified rectangular hyperbola model, and the Rumex acetosa L. has the strongest adaptability to the local environment. Conclusions of the research provided a certain theoretical reference for ecological protection in Jishishan area.

Key words: Alpine meadow, Photosynthesis-light response curve, Fitting model, Rumex acetosa L., Potentilla fruticosa L., Fragaria vesca