Physiological responses of Phragmites communis to different soil environments in Keriya River

In order to study the physiological adaptability of desert plants living in Keriya River under different soil environments, this paper took Phragmites communis as the research object, analyzed the feature changes of physiological indicators including biomass, chlorophyll, soluble sugar, malondialdehyde (MDA) content, peroxidase (POD) activity, and researched the factors affecting physiological indices of P. communis by using path analysis. The results showed that, coerced by salt and drought stress, the biomass accumulation of P. communis was inhibited. Compared with oasis soil, biomass of salt marshes soil decreased by 60%, and the reduction was 18.8% in sandy soil. But P. communis could adapt stress environment by increasing the proportion of underground biomass, the proportion of underground biomass of P. communis in sandy soil reached 78.5%. The physiological indicators of P. communis were mainly affected by soil water and salinity, chlorophyll content, soluble sugar content and POD activity were mainly affected by moisture, and protein content, proline and MDA content were mainly affected by salinity. Under stress, chlorophyll content, protein content, POD activity decreased, while soluble sugar content, proline content, MDA content increased. Plants would adapt the changes of salinity and water in soil by such kinds of regulatory mechanism