二嗪农是一种有机磷农药,广泛用于农业和家庭害虫防治,它的使用也会带来一些环境和健康危害。在这项研究中,我们调查了白洋淀地嗪农的时空分布,根据RQ(风险商)和TU(毒性单位)分析评估了其对水生生物的潜在生态风险和毒性,并基于高通量测序数据的统计分析,评估了二嗪农积累对益生菌和病原体的潜在影响。结果表明,白洋淀二嗪农对沉积栖息生物具有低到中等的慢性风险,对水生无脊椎动物具有低毒性作用,主要集中在10月份和人力密集地区。同时,沉积物电导率(EC)增加,无定形氧化铁含量和酚氧化酶活性有利于二嗪农在沉积物中的积累,而沉积物有机碳的情况恰恰相反,β-1,4-葡萄糖苷酶,磷酸酶过氧化氢酶和pH,这表明环境指标在二嗪农的行为和分布中起着关键作用。此外,严重污染地区的二嗪农似乎抑制了稀有益生菌(青春期双歧杆菌和沙雷氏菌。),而促进优势病原体(例如,伯克霍尔德氏菌),这可能会增加人类和生态系统的疾病风险,破坏生态平衡和潜在的健康问题。然而,抗二嗪农的益生菌链霉菌将是去除二嗪农的潜在降解剂。总之,这项研究揭示了二嗪农污染对湿地生态系统的影响,强调生态影响和潜在的健康问题。此外,抗二嗪农益生菌的发现为湿地生态恢复提供了新的见解。
Diazinon is an organophosphorus pesticide widely used in agriculture and household pest control, and its use also poses several environmental and health hazards. In this study, we investigated the spatial and temporal distribution of
diazinon in Baiyangdian, evaluated its potential ecological risk and toxicity to aquatic organisms based on RQ (Risk quotient) and TU (Toxic unit) analysis, and assessed the potential effects of diazinon accumulation on probiotics and pathogens based on statistical analysis of high-throughput sequencing data. The results showed that
diazinon in Baiyangdian posed a low to moderate chronic risk to sediment-dwelling organisms and a low toxicity effect on aquatic invertebrates, which was mainly concentrated in October and human-intensive areas. Meanwhile, increases in sediment electrical conductivity (EC), amorphous iron oxides content and phenol oxidase activity favored diazinon accumulation in sediments, whereas the opposite was the case for sediment organic carbon, β-1,4-glucosidase, phosphatase, catalase and pH, suggesting that environmental indicators play a key role in the behavior and distribution of diazinon. In addition,
diazinon in heavily contaminated areas seem to inhibit the rare probiotics (Bifidobacterium adolescentis and Serratia sp.), while promoted dominant pathogens (e.g., Burkholderia cenocepacia), which can lead to increased disease risk to humans and ecosystems, disruption of ecological balance and potential health problems. However, probiotic Streptomyces xiamenensis resist to
diazinon would be a potential degrader for
diazinon remove. In conclusion, this study unveiled the effects of diazinon pollution on wetland ecosystems, emphasizing ecological impacts and potential health concerns. In addition, the discovery of diazinon resistant probiotics provided new insights into wetland ecological restoration.