金川荒漠植物光响应曲线最优模型分析

Analysis on optimum model of light response curve of desert plants in Jinchuan

为探究荒漠植物的光合生理状况,采用Li-6400XT便携式光合仪在金川矿区测量了疏花软紫草( Arnebia szechenyi )、盐生草( Halogeton glomeratus )、木本猪毛菜( Salsola arbuscula )3种植物光合-光响应,并对其进行拟合分析,以期提高光合光响应曲线拟合的准确性并对3种植物的光合生理特征进行探索。研究发现:不同的模型对同一种植物的光响应曲线拟合结果存在较大差异,同一种模型对不同植物的拟合结果亦存在明显差异;直角双曲线修正模型为疏花软紫草和木本猪毛菜的拟合效果最优模型,而非直角双曲线模型对盐生草的拟合结果最佳;3种植物光合能力大小依次为疏花软紫草、木本猪毛菜和盐生草。

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 .