Department of Fisheries and Environmental Sciences, Faculty of Natural Resources and Earth Science, Shahrekord University, P.O. Box 115, Shahrekord, Iran.
Department of Rangeland and Watershed Management, Faculty of Natural Resources and Earth Science, Shahrekord University, P.O. Box 115, Shahrekord, Iran.
Environ Monit Assess. 2020 Jul 14;192(8):518. doi: 10.1007/s10661-020-08473-1.
The Choghakhor Wetland in Chaharmahal and Bakhtiari Province (Iran) has a significant role in maintaining water and sediment quality, because the wetland acts as a sink for contaminants that can pollute the aquatic ecosystem and affect human health. The present study uses a simple geostatistical technique to investigate the spatial variability of Cd and Pb in the Choghakhor Wetland to link the spatial variations of sediments to heavy metal contents in Myriophyllum spicatum. It was hypothesized that the heavy metal contents in the Choghakhor Wetland sediments impacted the concentration values in macrophytes. The value of heavy metals in sediments ranges from 0.54- to 1.84-μg/g dry weight (dw) for Cd, and from 1.32- to 2.46-μg/g dw for Pb, with a mean value of 1.12- and 1.82-μg/g dw, respectively. The mean value of Cd and Pb was 1.14- and 1.67-μg/g dw, respectively, in the aquatic macrophyte Myriophyllum spicatum, with corresponding ranges of 0.9-1.83-μg/g dw and 1.33-1.95-μg/g dw. There was a spatial structure in the Cd and Pb contents in the wetland sediments, with lower contents in the northern zone despite the values quantified in the south. We observed a direct spatial relationship between the Cd content in sediments and the Cd concentration in M. spicatum, and confirmed an effect of plant uptake for Cd. However, there were no significant differences between Pb in sediments and Pb in samples of M. spicatum, which implied that other factors like discharged industrial waste could also affect the accumulation of metals in plants. It can be concluded that spatial patterns indicated differences in the territory of the sediment Cd content at the Choghakhor Wetland localization in association with sediment enrichment. However, it was surprising that Pb did not show this pattern despite anthropic pressure.
伊朗恰哈马哈勒-巴赫蒂亚里省的乔加霍克湿地在维持水质和沉积物质量方面发挥着重要作用，因为湿地是污染物的汇，这些污染物可能会污染水生生态系统并影响人类健康。本研究采用简单的地质统计技术来研究乔加霍克湿地中 Cd 和 Pb 的空间变异性，以将沉积物的空间变化与满江红中重金属含量联系起来。研究假设乔加霍克湿地沉积物中的重金属含量会影响大型植物中的浓度值。沉积物中重金属的含量范围为 Cd 的 0.54-1.84μg/g 干重（dw）和 Pb 的 1.32-2.46μg/g dw，平均值分别为 1.12μg/g 和 1.82μg/g dw。水生大型植物满江红中 Cd 和 Pb 的平均值分别为 1.14μg/g 和 1.67μg/g dw，范围分别为 0.9-1.83μg/g dw 和 1.33-1.95μg/g dw。湿地沉积物中 Cd 和 Pb 的含量存在空间结构，尽管南部地区的含量较低，但北部地区的含量也较低。我们观察到沉积物中 Cd 含量与满江红中 Cd 浓度之间存在直接的空间关系，并证实了植物对 Cd 的吸收作用。然而，沉积物中 Pb 与满江红样品中 Pb 之间没有显著差异，这意味着其他因素，如排放的工业废物，也可能影响植物对金属的积累。可以得出结论，空间模式表明与沉积物富化相关的乔加霍克湿地局部沉积物 Cd 含量的领土存在差异。然而，令人惊讶的是，尽管存在人为压力，Pb 却没有显示出这种模式。
