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英国留学生66402需求Effects of Elodea spp定制

时间:2011-03-30 22:11来源:留学生论文网 编辑:会计论文网 点击:
We are to find out how do different submerged aquatic vegetation influence the diurnal cycle of several water quality measurements with and without the treatment which is addition of sewage. Measurements includes dissolved oxygen, pH, conduc

Effects of Elodea spp. and Sphagnum on the diurnal cycles of Dissolved Oxygen, pH, Conductivity, Temperature, Nitrogen and Phosphorous in the water with the presence of primary treated sewage.

Abstract
We are to find out how do different submerged aquatic vegetation influence the diurnal cycle of several water quality measurements with and without the treatment which is addition of sewage. Measurements includes dissolved oxygen, pH, conductivity, temperature, nitrogen and phosphorous. Each species has two samples. One is control, the other one will be assigned treatment. A course of three days will be scheduled to carry out the measurement at specific time points. Lamp lights are used to provide light as a representation of sun and they will be closed during the night time. Results shown that DO, pH and temperature have strong diurnal cycle whereas the conductivity excluding the Hydrogen ions does not show a diurnal cycle. Vegetations take up NH4+ and SRP in the sewage and produce NO2+NO3.

Introduction
One of the reason why wetland is such a precious ecosystem as a nutrient cycling mechanism is its ability to change the water chemistry on some key chemicals like nitrogen and phosphorous. The vegetation contributes a lot in this case as they take up these nutrients to grow in which processes they regulate the nutrient level. Therefore they can also function as a sewage treatment. In this experiment, we are using Elodea spp. and sphagnum as the experimental species and find out how do they change the water chemistry. Submersed macrophytes can be important for the N metabolism in NH super(+) sub(4)-rich freshwaters (e.g., wastewater treatment systems) by stimulating nitrification through providing surfaces for attached nitrifying bacteria and possibly also through diurnal changes in the water chemistry. (Dale H. Vitt. Et al. 2003) As a result, I predict the N and P concentrations in the sewage added will drop steadily throughout the experiment as the vegetation assimilates them as nutrients. However, their level could maintain. Since either N or P could become the limiting factors as a certain ratio between them is required for plants (R.H. Kadlec, 2008). Moreover, in addition to modify the N, P concentration in the water body, macrophytes and sphagnum also cause diurnal cycles in water bodies on DO, pH as a result of the diurnal cycle of the natural temperature change as well as the result of photosynthesis by these submerged vegetation. Photosynthesis will take up carbon dioxide and produce oxygen. Therefore DO is likely to increase during illumination whereas pH will increase during this period as the H2CO3 increases in the water. The opposite will happen during night time. We will also look at the conductivity difference them. As the nutrients are being taken up, I will assume the conductivity will drop as fewer ions are available in the water.

Materials and methods
Two species were used in this experiment. They are Elodea spp. and Sphagnum. Two water tanks of sample were set up for each of them with one being control experiment and the other one being treated experiment. The diurnal cycle of sun light is created by using lamp lights in the laboratory room.  Students were asked to turn on the lamps when dawn came and to turn them off when dust came. Water quality measurements were recorded by using corresponding equipments on a length of three days on/daixieAssignment/daixieyingguoassignment/ different time stamps. pH meter, EC meter and DO meter were used to accomplish the data collection.



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