Water environment quality of Dongyu River and estuary area of Nansi lake (Shandong Province, China) based on the characteristics of diatom community

IF 1.3 4区 环境科学与生态学 Q3 ECOLOGY Journal of Freshwater Ecology Pub Date : 2023-10-24 DOI:10.1080/02705060.2023.2274349
Shuyu Tong, Liwei Yang, Liyuan Wang, Ran Yang, Shiyue Chen
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Abstract

The Dongyu River is a national site for monitoring the inflow of Nansi Lake, located in the southwest of Shandong Province, China. Water quality has a significant impact on the safety of the South-to-North Water Diversion Project. To investigate the water quality of Dongyu River and the estuary area of Nansi Lake, we collected water samples and surface sediments from Dongyu River and the estuary area in May 2019 and analysed the characteristics of the diatom communities and water quality. The results showed that 23026 diatom shells were identified at 15 sampling points in the study area, belonging to 161 species of 23 genera. The dominant diatom taxa were Cyclotella meneghiniana, Fragilaria fasciculata, Fragilaria ulna, Amphora libyca, and Cocconeis placentula. Redundancy analysis explained 43.2% of diatom change information. The Monte Carlo permutation test showed that NH4+-N and DO were significant environmental factors that affected diatom assembly, explaining 34.78% and 8.38% of the diatom variability, respectively. The results of the biological evaluation showed that the water quality of Dongyu River and the estuary area of Nansi Lake were in a light-medium pollution state. The RDA analysis of the diatom community and principal component analysis showed that the water quality of the middle and lower reaches of Dongyu River was poor. In general, the middle and lower reaches of Dongyu River are severely polluted by agricultural non-point sources and controlling the use of nitrogen and phosphorus fertilisers and the emission of nitrogen-containing organic matter can preserve the aquatic water quality of Dongyu River and the water safety of the East Route of the South-to-North Water Transfer Project.
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基于硅藻群落特征的东榆河及南四湖河口区水环境质量
东榆河是监测南四湖流入的国家级站点,位于中国山东省西南部。水质对南水北调工程的安全有着重要的影响。为调查东榆河及南四湖河口水质,于2019年5月采集了东榆河及南四湖河口水样和表层沉积物,分析了东榆河及河口硅藻群落特征和水质特征。结果表明:研究区15个采样点共鉴定出硅藻壳23026种,隶属于23属161种;优势硅藻类群为meneghiniana Cyclotella、Fragilaria fasciculata、Fragilaria ulna、Amphora lilica和Cocconeis placentula。冗余分析解释了43.2%的硅藻变化信息。蒙特卡洛排列检验表明,NH4+-N和DO是影响硅藻组装的显著环境因子,分别解释了硅藻变异的34.78%和8.38%。生物评价结果表明,东榆河及南四湖入海口水质处于轻中污染状态。硅藻群落的RDA分析和主成分分析表明,东榆河中下游水质较差。总体而言,东榆河中下游地区受农业面源污染较为严重,控制氮磷肥的使用和含氮有机质的排放可以保护东榆河的水生水质和南水北调东线工程的水安全。
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来源期刊
CiteScore
2.20
自引率
7.70%
发文量
34
审稿时长
3 months
期刊介绍: The Journal of Freshwater Ecology, published since 1981, is an open access peer-reviewed journal for the field of aquatic ecology of freshwater systems that is aimed at an international audience of researchers and professionals. Its coverage reflects the wide diversity of ecological subdisciplines and topics, including but not limited to physiological, population, community, and ecosystem ecology as well as biogeochemistry and ecohydrology of all types of freshwater systems including lentic, lotic, hyporheic and wetland systems. Studies that improve our understanding of anthropogenic impacts and changes to freshwater systems are also appropriate.
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