摘要
为探究高原公路沿线草地土壤重金属的空间分布特征,以典型国道沿线草地土壤为研究对象,对土壤中6种重金属(Pb、Zn、Cu、Cd、Ni和Cr)含量进行研究,分析其空间分布特征和规律,评价土壤重金属污染情况和潜在的生态风险。结果表明,研究区域表层土壤(0~10 cm)中Pb含量随与公路距离的增加总体呈增加趋势;在不同距离下,土壤中Ni和Cr具有向下层积聚的趋势,而Pb、Zn和Cd则具有表层积聚的趋势;公路沿线土壤中Pb和Cu的稳定性相对较差,受交通活动影响较大,而Cd的稳定性相对较好;Cu、Pb与Zn含量之间存在极显著的正相关关系(P<0.01),Pb、Cr与Cu含量之间存在显著的正相关关系(P<0.05)。研究区公路沿线部分草地表层土壤中重金属Pb、Cd、Ni、Cr和Cu达到污染程度,不同距离下草地土壤重金属污染程度较高,土壤重金属的潜在生态风险为轻微至中等。由于研究区经济和旅游业正处于快速发展阶段,土壤重金属污染潜在生态风险将随交通流量的增加而增加,其公路沿线草地土壤重金属污染防治应受到重视。
To explore the spatial distribution characteristics of heavy metals in grassland soil along the plateau highways,the soil samples from the typical national highway grassland in the study area were selected as the research object.The contents of six heavy metals(Pb,Zn,Cu,Cd,Ni and Cr)in the soil were studied,and their spatial distribution characteristics and patterns were analyzed to evaluate the soil heavy metal pollution and potential ecological risks.The results showed that the Pb content in the surface soil(0-10 cm)increased with the increase of the distance from the road.At different distances,Ni and Cr tended to accumulate in the lower layer,while Pb,Zn and Cd tended to accumulate in the surface layer.The stability of Pb and Cu in soil along the highway was relatively poor,which was greatly affected by traffic activities,while the stability of Cd was relatively good.There was a highly significant positive correlation between Cu,Pb and Zn(P<0.01),and a significant positive correlation between Pb,Cr and Cu(P<0.05).The heavy metals Pb,Cd,Ni,Cr and Cu in the surface soil of grassland along the road all reached the pollution level.The degree of heavy metal pollution in the grassland soil at different distances was relatively high,and the potential ecological risk of heavy metals in the soil was slight to moderate.As the economy and tourism are developing rapidly,the potential ecological risk of soil heavy metal pollution will increase with growing traffic volume.Therefore,the prevention and control of heavy metal pollution in grassland soil along the highway should be given due attention.
作者
刘海金
于姣妲
汪进
杨靖宇
LIU Haijin;YU Jiaoda;WANG Jin;YANG Jingyu(Ruoergai County Forestry and Grassland Bureau,Ruoergai 624500,China;Chengdu Water Technology Center,Chengdu 610031,China;Sichuan Academy of Forestry Sciences,Chengdu 610081,China)
出处
《安徽农学通报》
2025年第16期69-75,共7页
Anhui Agricultural Science Bulletin
基金
四川省林草科技创新团队资助项目(2024LCTD0110)
森林与湿地恢复与保育四川省重点实验室资助项目(FC2023SKJT05)。
关键词
川西北高原
草地
土壤重金属
空间分布特征
生态风险
Northwest Sichuan Plateau
grassland
soil heavy metals
spatial distribution characteristics
ecological risk
