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| Characteristics of nitrogen accumulation in closed inland lakes in summer: A case study of Dali-Nor Lake, China |
| Received:January 02, 2018 |
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| KeyWord:water resources protection;closed inland lake;nitrogen;rivers into the lake |
| Author Name | Affiliation | E-mail | | YANG Xu | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China | | | LI Chang-you | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China | nndlichangyou@163.com | | LI Wen-bao | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China | | | SHI Xiao-hong | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China | | | ZHAO Sheng-nan | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China | | | WANG Xu-yang | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China | |
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| Abstract: |
| Nitrogen is one of the main factors affecting the primary productivity of lakes. The Dali-Nor Lake, which is located in the middle part of the Inner Mongolian plateau, is the study lake of this research. The nitrogen occurrence characteristics and transferring trends were analyzed for samples of lake water, pore water, and sediment and water samples from the lake inlets, collected in the summer of 2017. The impacts of the different nitrogen forms on the water quality of the lake also were studied. The results showed that ammonium nitrogen (NH4+-N) was the largest component of total nitrogen (TN) in the upper layer of the lake water. TN, nitrate nitrogen (NO3--N), and nitrite nitrogen (NO2--N) were mixed uniformly in the lake without distinct stratification, and the TN content remained the same from the top to the bottom of the lake. The TN content in the sediments was higher, and the migration of nitrogen was stronger. TN, NO3--N, and NO2--N were in the releasing state from the sediment to the upper water layer, whereas NH4+-N was mainly in the adsorption state from the upper water layer to the sediment. The input of the river had a dilution effect on the TN content of the lake water and increased the NO3--N load of the lake water. |
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