The establishment of season-specific eutrophication assessment standards for a water-supply reservoir located in Northeast China based on chlorophyll-a levels
The establishment of season-specific eutrophication assessment standards for a water-supply reservoir located in Northeast China based on chlorophyll-a levels
复制标题
基于叶绿素a水平的东北某供水水库季节富营养化评价标准的建立
DOI：
10.1016/j.ecolind.2017.09.056
复制
发表时间：
2018-02-01
影响因子：
6.9
通讯作者：
Zhang, Lanhe
中科院分区：
文献类型：
--
作者：
Guo, Jingbo;Zhang, Chongjun;Zhang, Lanhe
富营养化已成为全球大多数地表水体面临的主要问题，特别是当水体作为供水源时。从几十年前开始，人们就为预防和控制富营养化做出了巨大努力。其中，富营养化评价标准的建立是十分必要的。然而，对于我国等发展中国家的水体富营养化程度评价，至今还没有一个权威的标准。东北地区水体叶绿素a（Chl-a）含量与浮游植物生物量成正比，其季节变化明显，浮游植物生物量和种类组成受季节性气候、水文和污染源的影响较大，富营养化问题更加复杂。因此，建立特定季节的富营养化评价标准对于位于气温变化大的地区的水体具有极其重要的意义。本研究通过连续5年（2011-2015年）的水质参数检测，对东北某供水水库的季节性营养状态进行了评价。对不同季节的叶绿素a与其他水质参数进行了二元和多元回归分析。采用综合营养水平指数对各季节的营养状态进行评价，建立了各季节的富营养化评价标准。结果表明，磷是富营养化的主要限制性营养元素，叶绿素a含量具有季节性差异。水库总体处于轻度富营养状态。根据采集的水质数据，建立了春、夏、秋季的中营养评价标准和秋季的轻度富营养评价标准。中营养状态下，春、夏、秋三季总磷浓度分别为0.044、0.028和0.038 mg/L。此外，秋季的中营养和轻度富营养标准表明，不同营养水平标准间的参数差异并不一定呈现相同的变化趋势。综上所述，针对气温变化较大地区水体建立分季节的富营养化标准，对于科学评价营养状态和有效控制富营养化具有重要意义。
Eutrophication has become the primary problem facing most surface water bodies worldwide, especially when the water body serves as a water supply source. Substantial efforts have been made to prevent and control eutrophication from decades ago. Among them, the establishment of eutrophication assessment standards was rather essential. However, until now, there is no authoritative standard established for the assessment of eutrophication level in developing countries such as in China. For water bodies located in the Northeast China, the level of chlorophyll-a (Chl-a), which is proportional to phytoplankton biomass, tends to be subjected to evident seasonal variations as the phytoplankton biomass and species composition are greatly impacted by the seasonally alternated climate, hydrology and pollutants source, which in turn complicated the eutrophication problem. The establishment of season-specific eutrophication assessment standards was thus extremely significant for water bodies located in regions with large air temperature variations. In this study, water quality parameters were detected over five consecutive years (2011-2015) to assess the seasonal trophic state of a water-supply reservoir located in Northeast China. Bivariate and multiple regression were performed between Chl-a and other water quality parameters in different seasons. The trophic state of each season was evaluated by the comprehensive trophic level index and the season-specific eutrophication assessment standards were established. The results showed that phosphorus was the predominant limiting nutrient of eutrophication and the Chl-a levels were seasonally different. The reservoir was generally in a light-eutrophic state. Mesotrophic assessment standards were established for spring, summer and autumn and light-eutrophic assessment standards for autumn based on the water quality data collected. As the predominant nutrient, the concentrations of total phosphorus for the mesotrophic state for spring, summer and autumn were 0.044, 0.028 and 0.038 mg/L, respectively. Moreover, as shown by the mesotrophic and light-eutrophic standards of the autumn, the discrepancy of different parameters between the standards of different trophic level was were not necessarily varied in the same trend. In conclusion, the establishment of season-specific eutrophication standards for water bodies located in regions with large air temperature variations was significant for scientific trophic state evaluation and effective eutrophication control.