Author(s): Xiaohong Shi
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Keywords: No Keywords
Abstract: There was a long freezing period and large ice thickness in cold region lakes. With freezing process, the nutrients are discharged from ice to water, and concentrated in the water layer. Banding with next year’s melting process, nitrogen and phosphorus will be migration and transformation up-layer again, and then back to the water body of the whole lake. Thus, the freezing and thawing process, due to the ice medium, will have an essential impact to lake substances migration and transforming and water environmental succession. So, the characteristic massage of nutrients distribution in the ice-water-sediment multi-medium layer can not be ignored in the mechanism research of lake environmental change. In this paper, we chose Ulansuhai Lake in Inner Mongolia of China as study area, and using the water quality data from2011 to 2013 during the lake frozen season, analyzed the nutrients distribution characteristic in the ice-water-sediment multi-medium layer. The analysis results as follow: (1) Compared with the nutrient concentrations before lake frozen, the total nitrogen content of most the water samples is up to 2～5 times after frozen, and total phosphorus content is up to 2～8 times. (2) With depth increasing, concentrations of total nitrogen and total phosphorus in ice medium, show decreases first and then increases. And the nutrients concentrations in middle of ice are lower than the bottom and surface. And vertical concentration distribution is close to ice structures. (3) The presence of ice medium promotes increasing the concentration of nitrogen and phosphorus in the water and sediment.
Year: 2014