Characteristics of Mercury Pollution and Ecological Risk Assessment in Different Degraded Grasslands of the Songnen Plains, Northeastern China

Mercury (Hg) is a global and widely distributed heavy metal pollutant. can affect human health as well the of ecosystems poses ecological risks. The subjects this study are three types grassland in Beidianzi region, Songnen Plains, Northeastern China, characterized by different degrees degradation. mercury content levels atmosphere, soil, forage grass on grasslands were determined. In addition, relationships between pollution atmosphere distribution correlations soil plants, examined detail. potential risk index (RI), single factor (PI), ground accumulation (Igeo) used to evaluate results showed that soils exceeded China national standard (GB36600-2018), moderately degraded was highest. method land slightly polluted, while severely decreased with increase depth. variation trend atmospheric lower morning evening higher afternoon. indicated all at severe risk. There significant positive correlation mercury. herbage increased BP neural network prediction model constructed had good accuracy certain reference value.