红叶石楠叶片重金属含量特征及来源解析OA

The study selected Photinia×fraseri as bioindicator to systematically analyze the pollution characteristics,enrichment capacity,and potential sources of heavy metals including Cr,Ni,Cu,Zn,As,Cd,and Pb in its leaves.40 sampling points were set up across 5 types of functional zones marked as Ⅰ,Ⅱ,Ⅲ,Ⅳ and Ⅴ.Leaf samples were collected,and the contents of heavy metals were determined by Inductively Coupled Plasma-Mass Spectrometry(ICP-MS).The bioconcentration factor(BCF)was calculated,and Pearson correlation analysis was adopted to quantify the correlations among different heavy metals.The results showed that there were significant differences in the heavy metal contents in leaves.Specifically,the contents of Zn and As were the highest in zone Ⅰ and zone Ⅳ,reaching 128.55 and 0.17 mg/kg,respectively.The contents of Cr and Ni were the highest in zone Ⅱ and zone Ⅳ,and Cd content exceeded the standard at some sampling points.The overall heavy metal enrichment capacity of Photinia×fraseri leaves was weak,all belonging to"no or slight enrichment"(BCF≤1.72),mainly manifested as surface adsorption.Zone Ⅰ was the main source of Zn(contribution rate:57%),zone Ⅱ dominated the sources of Cr and Ni,and zone Ⅳwas the main sources of As,Cr,Pb and Ni.There was a strong correlation between Cr and Ni,as well as between As and Pb,with correlation coefficients of 0.98 and 0.78,respectively,indicating common sources for each pair.Collectively,Photinia×fraseri leaves can effectively indicate the spatial characteristics of heavy metal pollution from industrial,transportation,and domestic sources,providing a data reference for regional atmospheric pollution monitoring and environmental governance.