Seasonal Variation and Vertical Distribution of Inorganic Nutrients in a Small Artificial Lake, Lake Bulan, in Mongolia
Seasonal Variation and Vertical Distribution of Inorganic Nutrients in a Small Artificial Lake, Lake Bulan, in Mongolia
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DOI：
10.3390/w14121916
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发表时间：
2022-06
期刊：
影响因子：
3.4
通讯作者：
Ariunsanaa Baterdene;S. Nagao;Baasanjav Zorigt;Altansukh Ochir;K. Fukushi;D. Davaasuren;Baasansuren Gankhurel;Enkhuur Munkhsuld;S. Tsetsgee;Ariuntungalag Yunden
中科院分区：
文献类型：
--
作者：
Ariunsanaa Baterdene;S. Nagao;Baasanjav Zorigt;Altansukh Ochir;K. Fukushi;D. Davaasuren;Baasansuren Gankhurel;Enkhuur Munkhsuld;S. Tsetsgee;Ariuntungalag Yunden
这是蒙古首次在富营养化的小型淡水湖进行营养盐动态的季节性观测研究。营养物的垂直剖面和季节波动对于理解水生系统中的生物地球化学循环至关重要。在这项研究中，实地研究在喀拉河下游的一个小而浅的湖泊--布兰湖进行。在过去的20年里，该地区从集水区获得了越来越多的营养物质负荷。从2019-2022年季节性采集了该湖的水样，并分析了营养物质、主要阳离子、痕量金属和溶解有机碳。表层湖水中溶解无机氮(DIN)的平均浓度具有较大的季节变化，从8月份的0.26±0.11mgN/L到1月份的1.44±0.08mgN/L。在垂直剖面上也观察到季节差异。更替时4月和9月不同水深的浓度比较接近。当湖面被冰覆盖时，观测到了热力层结，最大的浓度出现在1月和8月的底层。磷酸盐浓度也表现出类似的变化趋势。这些结果表明，夏季和冬季层结对于底层营养物质的再生、生化循环和减缓全球变暖对蒙古小湖泊和浅水湖的影响都是重要的。
This is the first seasonal observation study on nutrient dynamics undertaken in a small freshwater lake with eutrophication in Mongolia. The vertical profile and seasonal fluctuation of nutrients are crucial to understanding the biogeochemical cycles in aquatic systems. In this study, field research was carried out at a small and shallow lake, Lake Bulan, in the lower Kharaa River basin. The area has been receiving increased nutrient loads from the water catchment area for the last 20 years. Water samples were collected seasonally from the lake from 2019–2022 and analyzed for nutrients, major cations, trace metals, and dissolved organic carbon. The average concentration of dissolved inorganic nitrogen (DIN) in the surface lake water had a wide seasonal variation from 0.26 ± 0.11 mg N/L in August to 1.44 ± 0.08 mg N/L in January. Seasonal differences were also observed in the vertical profiles. Concentrations were relatively similar at the various water depths in April and September at turnover time. Thermal stratification was observed when the lake was covered in ice, with the maximum concentrations being observed in the bottom layer in the months of January and August. The phosphate concentration showed a similar variation trend. These results indicate that both the summer and winter stratifications are important for regeneration of nutrients in the bottom layer, biochemical cycling, and mitigating impacts of global warming on small and shallow lakes in Mongolia.