Effect of different varieties of rice on removal phosphorus and nitrogen from eutrophic water in Dianchi lake.

Using aquatic plants to purify eutrofic water bodies was one of the biological way,which was drawing more and more attention.In this study,five varieties of Oryzae were cultivated in eutrophic water with solution culture to search for the suitable plant variety in water purification.The phosphorus and nitrogen content of plant tissue and biological traits plants were tested to study the effect of phosphorus and nitrogen removal.The results showed that all plants grow well in eutrophic water without addition any of nutrients.The aquatic plants had removal effect of total phosphorus(TP) and ammonium nitrogen(NH4-N).The treatments with aquatic plants had 75.54 %-88.54 % and 90.43 %-96.82 %TP and NH4-N removal,respectively.Meanwhile the treatments without aquatic plants had TP and NH4-N removal of 49.14 % and 88.13 %,respectively.In the whole growth period,different varieties of rice made a dynamic rule to the TP and NH4-N removal.Red corn made the highest removal effect of TP and NH4-N in the five varieties of rice and it had a adaptable ability.Red corn was worthy of popularization and application in the future wetland.