| 内蒙古典型湖泊水环境特征及水质评价 |
| 摘要点击 2673 全文点击 750 投稿时间：2022-12-27 修订日期：2023-02-25 |
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| 中文关键词 内蒙古高原 水质评价 时空分布 特征因子 影响因素 |
| 英文关键词 Inner Mongolia water quality assessment spatiotemporal distribution characteristic impact factor |
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| 中文摘要 |
| 内蒙古高原湖泊位于我国北疆的生态脆弱区，在调节区域气候、生态环境和维系生物多样性等重要生态功能中发挥着十分重要的作用.由于自然因素以及人为因素的双重影响，内蒙古湖泊水环境面临着挑战.为明确内蒙古湖泊整体的水质情况，基于2019年秋季（10~11月）与2021年夏季（7~8月）内蒙古典型湖泊的水质数据，探讨其水质时空变化规律，并分析不同指标对湖泊水质的影响，进而识别出影响湖泊水质的关键因子.结果表明：①内蒙古典型湖泊春秋两季的多项理化指标在时空分布上均有差异.时间尺度上，主要以氨氮（NH4+-N）以及亚硝氮（NO2--N）等指标含量在秋季时低于夏季，溶解氧（DO）含量秋季时高于夏季；空间尺度上，内蒙古西南部湖泊的总磷（TP）、总氮（TN）、化学需氧量（COD）和盐度（Sal）等指标含量高于东北部的湖泊，DO则与之相反.②溶解性总固体（TDS）为内蒙古典型湖泊水质的主要特征因子.③湖泊综合水质质量指数（WQI）时空分布差异显著，湖泊水质等级随TDS分区的升高而降低，且湖泊水质秋季优于夏季. |
| 英文摘要 |
| Lakes on the Inner Mongolia Plateau, located in the ecologically fragile area of the northern border of China, play a very important role in regulating the regional climate and ecological environment and maintaining biodiversity. Owing to the dual influence of natural factors and human factors, the lake water environment in Inner Mongolia is facing challenges. To clarify the overall water quality of lakes in Inner Mongolia, based on the water quality data of typical lakes in Inner Mongolia in autumn 2019(October-November) and summer 2021(July-August), the temporal and spatial variation in water quality was discussed, and the influence of different indexes on lake water quality was analyzed, and the key factors affecting lake water quality were identified. The results showed as follows:① the spatiotemporal distribution of multiple physicochemical indices of typical lakes in Inner Mongolia were different in the two seasons. On the time scale, the concentration of ammonia nitrogen(NH4+-N) and nitrite nitrogen(NO2--N) were lower in autumn than that in summer, whereas dissolved oxygen(DO) was higher in autumn than that in summer. On the spatial scale, the concentrations of total phosphorus(TP), total nitrogen(TN), chemical oxygen demand(COD), and salinity(Sal) and other indicators in the southwest lakes of Inner Mongolia were higher than those of lakes in the northeast, but the DO index showed the opposite trend. ② Dissolved total solids(TDS) was the main characteristic factor of water quality of typical lakes in Inner Mongolia. ③ The spatiotemporal distribution of lake water quality index(WQI) was significantly different. The lake water quality level decreased with the increase in TDS, and the lake water quality was better in autumn than that in summer. |
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