黔中喀斯特高背景土壤-辣椒系统重金属含量特征及生态风险评价
Characteristics of heavy metals and assessments of ecological risks in cultivated soil-pepper system of Karst Areas
曾宪平 1万继磊 2李密 2湛天丽 3文锡梅4
作者信息
- 1. 遵义市农村发展服务中心,遵义,563000
- 2. 贵州省宸铭鑫农业科技有限公司,贵阳,551400
- 3. 贵州省山地资源研究所,贵阳,550001;中国科学院地球化学研究所,贵阳,550001
- 4. 贵州省山地资源研究所,贵阳,550001
- 折叠
摘要
贵州喀斯特地区碳酸盐岩广泛分布,土壤重金属含量显著高于其他地区.人为干扰前,土壤重金属处于高背景低活性的状态.为了解贵州喀斯特地区耕地土壤和种植辣椒的重金属含量及其生态风险.本研究以清镇市辣椒产地土壤为研究对象,采用潜在生态风险指数法和生物富集法对土壤和辣椒重金属含量及其生态风险进行评价.结果表明,清镇市耕地土壤重金属Cd、Hg、As、Pb和Cr含量平均值分别为 0.75、0.74、111.85、33.50、109.62 mg·kg-1,Cd 和 As 含量平均值分别是国家标准 GB5618-2018 的2.25倍和2.79倍,土壤重金属Cd、As和Hg存在显著正相关.清镇市辣椒产地土壤重金属综合潜在生态风险指数RI呈轻微风险水平,各乡镇差异较大(51.13-228.59).辣椒对5种重金属的富集系数均小于1,对5种重金属吸收能力较弱.辣椒重金属Cd与土壤pH呈显著负相关.建议当地农户耕作过程中注意土壤重金属的污染来源,重点关注土壤重金属污染的累积风险.
Abstract
Carbonate rocks are distributed widely in karst areas in Guizhou Province,and the contents of soil heavy metals are significantly greater than those in other areas.Without human disturbance,soil heavy metals are of high background and low activity in karst areas.In this study,samples of soil and pepper were collected from pepper planting garden in Qingzhen City in Guizhou Province to understand the contents of soil heavy metals and their ecological risk,and to analyze contents of heavy metals in pepper from karst areas in Guizhou Province.The results showed that the average contents of Cd,Hg,As,Pb and Cr in the collected soil samples were 0.75 mg·kg-1,0.74 mg·kg-1,111.85 mg·kg-1,33.50 mg·kg-1 and 109.62 mg·kg-1,respectively.The average contents of Cd and As were 2.25 times and 2.03 times of the value limited by the national standard(GB5618-2018),respectively.There were some significant positive correlations among Cd,As and Hg in soils.The comprehensive potential ecological risk index(RI)of soil heavy metals in pepper planting gardens in Qingzhen City was at a slight risk level,and considerable differences of RI were observed among different villages and towns(51.13-228.59).All of the enrichment coefficients of pepper to the studied heavy metals were less than 1,and this,probably,suggested that pepper is of weak absorption capacity to these heavy metals.It is also found that Cd in pepper was negatively correlated with soil pH.It is suggested that local farmers care the sources of heavy metal pollution during farming activities,and special attention should be paid on the accumulation risk of heavy metal pollution in soils.
关键词
喀斯特/辣椒/种植土壤/重金属/潜在生态分析Key words
karst/pepper/soil of origin/heavy metals/potential ecological analysis引用本文复制引用
基金项目
国家自然科学基金(41561075)
贵阳市科技计划(筑科合同[2021]3-4号)
贵阳市科技计划(筑科合同[2022]3-1号)
贵阳市科技计划(筑科合同[2021]3-27号)
贵州科学院青年基金(黔科院J字[2020]17号)
出版年
2024
NETL
NSTL
万方数据