| Hulun Lake is located in semi-arid temperate zone and continental climate with high latitudes, which is the largest freshwater lake in the central of arid region in Asia; it has been included in the List of emphasis of wetlands in international and accepted as World Biosphere Reserve by UNESCO. It is not only the important fishery of freshwater waters, also the largest comprehensive nature reserves mainly to protect the grassland, wetland systems and rare endangered birds in northeastern China. Hulun wetlands and Daxinganling forest build the ecological barrier of northeast even north in China together. So, it has occupies an extremely important position to examine the eutrophication.This study was carried out on the geochemical behavior of nitrogen, phosphorus and other biogenic elements in the overlying water and sediment of Hulun Lake, which is the shallow lake in arid areas within the Mongolian Plateau. Revealed the status of Hulun eutrophication, which as a reference to control the lake being eutrophication. The results are described as follows: 1. The study suggests that the distribution characteristics and existing forms of nitrogen phosphorus in the overlying water and sediments of Hulun lake, indicating the phosphorus is a limited factor in eutrophication.2. The typical sources of organic matter in surface sediment of Hunlun Lake was Judging by TOC/TN.3. The study suggests that the organic nitrogen is the main exiting form of nitrogen, while the De-P is the main exiting form of phosphous in sediments of Hulun Lake.4. According to the organic index and the environment quality appraise criterion of nutrition, the TP and TN contamination in the overlying water of Hulun Lake has achieved to level V, and the organic contamination inn the surface sediments has achieved to level IV. The content of TN and TP in the surface sediments of Hulun Lake is obvious higher than the lowest environment quality appraise criterion of nutrition made by ONT. |
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