Study On The Physiological Response And Enrichment Ability Of Sagittaria Sagittifolia Under Phosphorus Stress In Polluted Water

Eutrophication is the main performance of water pollution and the most prominent environmental problem in the world, which is also a hard question of water pollution control in our country. Repairing the eutrophication with aquatic plants is an effective way to governing water pollution, because it costs low, makes less disturbance to the environment and has good ecological benefits. By designing the stress experiment of single phosphorus factor, the growth status and P(phosphorus) enrichment effect of Sagittaria sagittifolia(a common aquatic plant in Hun River upstream) under low concentration(3 mg/L) and high concentration(12 mg/L) of P stress after short-term(7 d) and long-term(21 d) exposure were comparatively studied, in order to prove that whether Sagittaria sagittifolia could be used to repair the water pollution of Hun River upstream and whether it could also be used when the P concentration in water rises, so as to provide a theoretical basis for the practical application and further utilization of Sagittaria sagittifolia in repairing polluted water. The main conclusions are as follows.1. Sagittaria sagittifolia grew the same well under both low and high concentration of P stress, which indicated that it had great tolerance to high concentration of P stress and could be used to repair the water pollution in Hun River upstream. Sagittaria sagittifolia could continue to grow well and work even if the P concentration rose.2. The content of photosynthetic pigment in Sagittaria sagittifolia was higher under high concentration of P stress, but the content of photosynthetic pigment decreased significantly with the increase of stress time.3. The change of relative electric conductivity indicated that high concentration of P stress caused some damages to the membranes of Sagittaria sagittifolia, but the stress time had no effect on the membranes. Both P concentration and stress time had no significant effect on the soluble protein content of Sagittaria sagittifolia.4. The P accumulation(root P accumulation and shoot P accumulation) and translocation factor of Sagittaria sagittifolia were the same under both low and high concentration of P stress, which indicated that Sagittaria sagittifolia had the same P enrichment ability under both low and high concentration of P stress.