Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Sciences, Northwest University, Xi'an 710127, China.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China.
Ecotoxicol Environ Saf. 2023 Mar 15;253:114713. doi: 10.1016/j.ecoenv.2023.114713. Epub 2023 Mar 2.
Persistent Organic Pollutants (POPs) may exert adverse effects on human and ecosystem health. However, as an ecologically fragile zone with strong interaction between river and groundwater, the POPs pollution in the riparian zone has received little attention. The goal of this research is to examine the concentrations, spatial distribution, potential ecological risks, and biological effects of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) in the riparian groundwater of the Beiluo River, China. The results showed that the pollution level and ecological risk of OCPs in riparian groundwater of the Beiluo River were higher than PCBs. The presence of PCBs (Penta-CBs, Hexa-CBs) and CHLs, respectively, may have reduced the richness of bacteria (Firmicutes) and fungi (Ascomycota). Furthermore, the richness and Shannon's diversity index of algae (Chrysophyceae and Bacillariophyta) decreased, which could be linked to the presence of OCPs (DDTs, CHLs, DRINs), and PCBs (Penta-CBs, Hepta-CBs), while for metazoans (Arthropoda) the tendency was reversed, presumably as a result of SULPHs pollution. In the network analysis, core species belonging to bacteria (Proteobacteria), fungi (Ascomycota), and algae (Bacillariophyta) played essential roles in maintaining community function. Burkholderiaceae and Bradyrhizobium can be considered biological indicators of PCBs pollution in the Beiluo River. Note that the core species of interaction network, playing a fundamental role in community interactions, are strongly affected by POPs pollutants. This work provides insights into the functions of multitrophic biological communities in maintaining the stability of riparian ecosystems through the response of core species to riparian groundwater POPs contamination.
持久性有机污染物（POPs）可能对人类和生态系统健康产生不利影响。然而，作为一个河地下水相互作用强烈的生态脆弱带，河岸带的 POPs 污染问题一直没有得到关注。本研究旨在考察中国北洛河河岸带地下水中有机氯农药（OCPs）和多氯联苯（PCBs）的浓度、空间分布、潜在生态风险和生物效应。结果表明，北洛河河岸带地下水中 OCPs 的污染水平和生态风险高于 PCBs。PCBs（五氯苯、六氯苯）和 CHLs 的存在可能分别降低了细菌（Firmicutes）和真菌（Ascomycota）的丰富度。此外，藻类（金藻门和硅藻门）的丰富度和 Shannon 多样性指数降低，这可能与 OCPs（滴滴涕、CHLs、DRINs）和 PCBs（五氯苯、七氯苯）的存在有关，而对于后生动物（节肢动物），其趋势相反，可能是由于 SULPHs 污染所致。在网络分析中，属于细菌（变形菌门）、真菌（子囊菌门）和藻类（硅藻门）的核心物种在维持群落功能方面发挥着重要作用。伯克霍尔德氏菌科和慢生根瘤菌可以被认为是北洛河 PCBs 污染的生物指标。需要注意的是，交互网络的核心物种，在群落相互作用中起着基础性作用，受到 POPs 污染物的强烈影响。这项工作通过核心物种对河岸带地下水 POPs 污染的响应，为了解多营养层次生物群落通过核心物种在维持河岸带生态系统稳定性方面的功能提供了新的认识。
