|Table of Contents|

The presence of and ecological risk from microplastics and heavy metal pollutants in the near-shore moss zone of the five rivers in Poyang Lake(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2021 05
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The presence of and ecological risk from microplastics and heavy metal pollutants in the near-shore moss zone of the five rivers in Poyang Lake
RAO Dan1 JIAN Minfei1 2? YANG Zixuan1 ZHANG Chen1 CONG Mingyang3 CUI Ning1 YANG Wenjing4 & NI Caiying4
1 Key Laboratory of Protection and Utilization of Subtropical Plant Resources of Jiangxi Province, College of Life Science, Jiangxi Normal University, Nanchang 330022, China 2 Jiangxi Provincial Key Laboratory of Water Resources and Environment of Poyang Lake, Jiangxi Provincial Institute of Water Sciences, Nanchang 330029, China 3 Center of Analysis and Testing, Jiangxi Normal University, Nanchang 330022, China 4 Key Laboratory of Poyang Lake Wetland and Watershed Research of Ministry of Education, Jiangxi Normal University, Nanchang 330022, China
Poyang Lake riparian zone moss substrate microplastics heavy metal

We selected the moss layer and lower substrate layer in the near-riparian zone of Poyang Lake and its five tributaries as the subjects to study the distribution characteristics and ecological risks of pollution from microplastics (MPs) and heavy metals (HMs) in the wetland around the lake. The abundance and morphological diversity of MPs in the moss and substrate layers were identified and analyzed, the cadmium, lead, and copper contents in the mosses and substrates determined, and the morphological distribution characteristics of the HMs in the substrate were analyzed. We also evaluated the intercept effects of the moss and substrate layers on MPs and HMs, and the ecological risks of pollutants coexisting in the wetland around Poyang Lake. The results showed that the abundance of residual MPs in the moss layers in the study area ranged from 314 to 1396 MP/kg with a significant difference (P ≤ 0.05) among sampling points. However, the abundance of MPs in the lower substrates ranged from 102 to 231 MP/kg. The enriched cadmium, lead, and copper contents in the mosses ranged from 1.67 to 5 mg/kg, from 42.78 to 135 mg/kg, and from 11.11 to 50 mg/kg, respectively although the total cadmium, lead, and copper contents in the lower substrates were from 0.67 to 7.67 mg/kg, 12 to 215.67 mg/kg, and 8 to 54 mg/kg, respectively. The morphological composition of different HMs in the lower substrates was dominated by F4 (residual state). Results of ecological risk assessment for HM pollution at the different sampling sites showed that the cadmium pollution level of the lower substrates reached “severe pollution” at 16 sampling sites, while the levels of lead and the copper pollution were relatively light. The results of correlation analysis of the coexistence of MPs and HMs showed that there was a certain correlation between the abundance of MPs and the enrichment of cadmium and lead in the moss layer. However, the abundance of MPs in the lower substrates was only significantly correlated to its copper content and this, combined with the morphology of cadmium in the soil substrate being F3 (oxidizable state) and F4. The compound pollution of MPs and HMs poses a certain ecological risk to the Poyang Lake and its five river basins, and some effective prevention and control measures should be implemented.


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