| Potamogenton crispus Iris sibirica and Canna glauca are three Cold-resistance water plants. They are three hydrophytes which offer very high potential for exploitation in water ecological restoration. The NH4-N tolerance range and water purification in winter were studied. This study can provide theories and technique support for water ecological restoration.In the study of NH4-N tolerance range and water purification in winter about this three water plants. We found five main results as follows:(1) The results indicates this three water plants have good abilitys to NH4-N stress. They are three good water purification species in water ecological restoration. NH4-N tolerance range of Potamogenton crispus,Iris sibirica and Canna glauca are 02mg/L,010mg/L and 020mg/L.(2) The results showed that high NH4-N concentration culture solution have a direct stress effects to this three water plants and the effects accentated as time goes on. Potamogenton beyond its tolerance when NH4-N concentration culture solution above 4mg/L. Iris sibirica beyond its tolerance when NH4-N concentration culture solution above 20mg/L. Canna glauca beyond its tolerance when NH4-N concentration culture solution above 40mg/L.(3) This three water plants have a good effect on water purification in winter. The order of their purifying effects is: Potamogenton crispus> Canna glauca >Iris sibirica>CK.(4) The order of their purifying effects to water quality is: NH4-N>TN>NO3-N>TP>COD. The pure water purification of Potamogenton crispus,Canna glauca and Iris sibirica to NH4-N are: 84.58%,76.25% and 75.83%; The pure water purification of Potamogenton crispus,Canna glauca and Iris sibirica to TN are: 54.06%,44.76% and 44.58%; The pure water purification of Potamogenton crispus,Canna glauca and Iris sibirica to NO3-N are: 44.90%,42.29% and 40.30%; The pure water purification of Potamogenton crispus,Canna glauca and Iris sibirica to TP are: 40.43%,29.78% and 19.15%; The pure water purification of Potamogenton crispus,Canna glauca and Iris sibirica to COD are: 35.47%,26.46% and 26.46%.(5) In the study of their purifying effects to water quality about difference significance analysis. We found the treatment have plants with the treatment without all significant differences. It is indidicates that plants have very important effect on water purification. |
