Li Jia-Yi, Lu Xian, Zhao Zhi-Miao, Han Hao-Yu, Zhang Yin-Jiang
College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China.
State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
Huan Jing Ke Xue. 2024 Aug 8;45(8):4610-4618. doi: 10.13227/j.hjkx.202308175.
The microplastics in aquatic ecosystems pose a serious threat to ecological security and environmental health, which have received widespread attention. To reveal the response of a water--sediment system to microplastics exposure, the was exposed to polyethylene microplastics （PE-MPs） with different mass fractions （1%-5%, sediment wet mass fraction）, and the effects of PE-MPs on the physiochemical indicators of water quality, morphological characteristics of submerged plants, physiological characters, antioxidant system, and microbial community structure in sediments were studied respectively. The results showed that the physiochemical properties of the water body were not significantly changed in the PE-MPs treatment group, whereas the plant height, oxidative stress index, and antioxidant system were significantly inhibited. For the plant height, the 1% PE-MPs treatment group height was only 47.44% of that in the control group. Chlorophyll a content was 81.04% of that in the control group, and the activities of catalase （CAT）, malondialdehyde （MDA）, and peroxidase （POD） increased by 233.70%, 117.82%, and 61.62%, respectively. Different mass fractions of PE-MPs had a certain impact on microbial community structure in sediments. The above results are helpful to improve the evaluation system of PE-MPs ecological risk in the water-submerged plant-sediment system.
水生生态系统中的微塑料对生态安全和环境健康构成严重威胁，已受到广泛关注。为揭示水-沉积物系统对微塑料暴露的响应，将[具体内容缺失]暴露于不同质量分数（1%-5%，沉积物湿质量分数）的聚乙烯微塑料（PE-MPs）中，分别研究了PE-MPs对水质理化指标、沉水植物形态特征、生理特性、抗氧化系统以及沉积物中微生物群落结构的影响。结果表明，PE-MPs处理组水体的理化性质无显著变化，而沉水植物的株高、氧化应激指数和抗氧化系统受到显著抑制。就株高而言，1%PE-MPs处理组的株高仅为对照组的47.44%。叶绿素a含量为对照组的81.04%，过氧化氢酶（CAT）、丙二醛（MDA）和过氧化物酶（POD）的活性分别增加了233.70%、117.82%和61.62%。不同质量分数的PE-MPs对沉积物中的微生物群落结构有一定影响。上述结果有助于完善水-沉水植物-沉积物系统中PE-MPs生态风险的评估体系。
