摘要
为了探究海南岛农用地土壤的环境质量和重金属污染情况,采集全岛133个农用地表层土壤样品,用地累积指数法以及潜在生态风险指数法对海南岛农用地土壤重金属污染情况和生态危害程度进行评估,结果显示:(1)海南岛农用地土壤中8种重金属Cd、Cr、Zn、Pb、Cu、Ni、Hg、As的地累积指数处于清洁水平的点位占83.46%,处于轻度污染的点位占7.52%,其中主要为Cd、Cr和Cu污染;处于偏中度污染的点位占4.51%的点位,其中Ni的污染占比最大。(2)海南岛农用地土壤受到重金属危害程度较低,研究区整体潜在生态风险等级为低风险。Cd为主要潜在危害元素,Cd处于中等、重度风险采样点占采样点数量的21.80%和3.76%,所占比重最大,说明部分点位地区农用地土壤Cd元素富集。本研究的结论:海南岛的农用地土壤环境质量总体良好,但有少部分区域土壤重金属污染属中等生态风险,主要分布区域在定安县南部、澄迈县北部以及昌江县和东方市交界处。
An attempt was made to explore the environmental quality and heavy metal contamination of agricultural land soil in Hainan Island.The surface soil samples from 133 agricultural lands in the whole island were collected to evaluate the soil heavy metal contamination and ecological risk in the study areas by using the geological accumulation index method and the potential ecological risk index method.The results showed that 83.46%of the soil sampling sites in the agricultural land of Hainan Island were unpolluted with low geological accumulation index of 8 heavy metals Cd,Cr,Zn,Pb,Cu,Ni,Hg and As,while 7.52%of the sampling sites were slightly polluted mainly by Cd,Cr and Cu,and 4.51%of the sampling sites were moderately polluted largely by Ni.The agricultural land soil in Hainan Island has a low contamination degree of heavy metals,and the potential ecological risk of heavy metals was very low in all the sampling sites.The main potential hazardous element was Cd,and the sampling sites with moderate and heavy risk of Cd were 21.80%and 3.76%,accounting for the largest proportion of the heavy metals.This indicates the soil of agricultural land is enriched with Cd in some sampling sites.It is concluded that the soil environmental quality of agricultural land in Hainan Island is generally good,although some agricultural land in Hainan has moderate ecological risk of heavy metals in soil,mainly in the south of Ding'an County,the north of Chengmai County,and the junction of Changjiang County and Dongfang City.
作者
钟王月
邹伟
徐诗琴
林积泉
ZHONG Wangyue;ZOU Wei;XU Shiqin;LIN Jiquan(School of Ecology and Environment Sciences,Hainan University,Haikou,Hainan 570228,China;Hainan Ecological and Environmental Monitoring Center,Haikou,Hainan 571126,China)
出处
《热带生物学报》
2023年第6期668-674,共7页
Journal of Tropical Biology
关键词
土壤
重金属含量
地累积指数
生态风险评价
soil
heavy metal content
geo-accumulation index
ecological risk assessment
