科研之友
微信
新浪微博
Facebook
分享链接
摘要
To investigate the potential impacts of human activities and environmental changes on water quality，this study collected the monitoring data of water quality from the estuaries of coastal urban agglomerations in Guangdong Province，and analyzed the trends of nutrient stoichiometry and trace element concentrations in the nearshore environment. Using the comprehensive pollution index method，we assessed the changes in ecological risks from 2015 to 2022. Additionally，we analyzed the correlation and clustering characteristics of aqueous solution properties（ASPs）indexes during the evolution of the nearshore water environment using correlation analysis and correlation network analysis. Finally，principal component analysis revealed the key factors driving the interactions among ASPs indexes. The results indicated that the concentration of major pollutants in estuarine water bodies in Guangdong Province was under control. However，the B/C，C/N，and C/P ratios gradually deviated from their natural background ratios，obstructing microbial energy utilization，nutrient fixation，and element mineralization efficiencies in water bodies. This led to water quality characteristics that were not favorable for further natural utilization，interfering the self-purification mechanism and capacity of water bodies. Under the influence of climate change，factors such as the unbalanced proportion of elements and the lack of restrictive elements would limit the function of water bodies，resulting in new environmental risks. Based on the correlation analysis and principal component analysis，it was evident that the concentration of compatible components was subject to a variety of physicochemical interactions with similar effects，establishing a complex element coupling system. The rapid changes in ecological conditions and the hydrological environment have disrupted the partitioning chain among elements. Therefore，it is necessary to establish an information feedback mechanism of the ASPs of the tailwater-river-estuary-ocean system. Future water environment management should comprehensively consider the hydrological characteristics，the total amounts of pollutants，and elemental ratio threshold. ? 2024 Science Press.
- 单位
