| Water is in great need of with the rapid development of industry and agriculture, the fast growth of population and the continuous growth of urbanization. So large amount of waste water is produced and released to oceans and lakes. Water-restoration is created for the severe environment problem. The way of using plants to restore polluted water has been in use for a long time. In this paper, calamus and fleur-de-lis are used to study the function of getting rid of nutrition elements in the water body. According to the contents of total nitrogen and total phosphorus in the plants, the absorption effects were judged. The growth status of plants in high polluted water and the absorption effect of nitrogen and phosphorus are also studied by setting different gradients of concentration experiments. Then the adsorption effect and biomembrane effect of sick of coconut, which was used as supporting carrier, are studied along the concentration gradient of ammonia nitrogen, nitre nitrogen and phosphate in the water. The results are these.1.In the outdoor experiments, the growth states of calamus and fleur-de-lis are obviously better than those of the indoor experiments. Calamus grew to the tallest states in the later October and stopped growing in winter, then began to wither from mid-November. Fleur-de-lis is at the stage of growing during the experiment, but grew slowly in winter. Leaves are the most important parts to accumulate nitrogen and phosphorus, and contents of them in leaves account for more than 50% in the plants.Net contents of TN and TP in roots, stems, leaves and the individuals of calamus and fleur-de-lis changed little from the initial stage of experiment to middle August. But they began to rise slowly from mid-August to the last ten days of August, and calamus reached the maximum on November 28, fleur-de-lis was on November 14.2.In the lab experiments, calamus can get rid of 97.5% of the total nitrogen. It also can get rid of 58.8% of the total phosphorus, 94.8% of the organic matter and 88.5% of the chlorophyll a. While iris can get rid of 89.6% of the TN, 49% of the TP, 91.8% of the organic matter and 98.5% of the chlorophyll a. It indicated that calamus and fleur-de-lis have great abilities to get rid of total nitrogen and organic matter, and that the largest speed of absorption of nitrogen is in the initial stage of the experiment. Two kinds of plants have priority to absorb the nitre attitude nitrogen inthe course of absorption of nitrogen. Two kinds of plants have obvious inhibition to alga, but are not so good at getting rid of phosphorus.3. In different gradient of ammonia nitrogen concentration experiments, plants grow fastest while just transplanted to the water and absorb ammonia nitrogen the most quickly. In 5 comparison groups, plants in C concentration group (which is 63.78 mg/L) grow the best, and plants in D concentration group (which is 109.44 mg/L ) and E concentration group (which is 190.37 mg/L ) were inhibited in some degree. Tender leaves transplanted can't grow well in the beginning. The concentration of ammonia nitrogen that calamus can get rid of increases along the initial ammonia nitrogen concentration with a watershed. When the concentration of ammonia nitrogen reaches a certain level, the absorption of ammonia nitrogen saturates and the level of initial ammonia nitrogen concentration is 63.78 mg/L in the experiment.4. Among different gradient of nitre nitrogen concentration experiments, in 5 comparison groups, plants in low concentration grow better, while plants in D concentration group (which is 109.44 mg/L ) and E concentration group (which is 190.37 mg/L ) were inhibited in some degree . The concentration of nitre nitrogen that calamus can get rid of increases along the initial nitre nitrogen concentration with a watershed. When the concentration of nitre nitrogen reaches a certain level, the absorption of nitre nitrogen is inhibited and will release nitre nitrogen to the water and the level is 109.44 mg/L in the experiment5. Among different grad... |
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