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湛江观海长廊红树林土壤-植物体系重金属富集与迁移规律
引用本文:李振良,谢群,曾珍,张际标,冯宇明,赖勇平,林玲玲. 湛江观海长廊红树林土壤-植物体系重金属富集与迁移规律[J]. 热带地理, 2021, 41(2): 398-409. DOI: 10.13284/j.cnki.rddl.003320
作者姓名:李振良  谢群  曾珍  张际标  冯宇明  赖勇平  林玲玲
作者单位:1.广东海洋大学 化学与环境学院,湛江 524088;2.广东海洋大学 分析测试中心,湛江 524088;3.广东海洋大学 管理学院,湛江 524088;4.广东海洋大学 食品与科学技术学院,湛江 524088;5.南方海洋科学与工程广东省实验室,湛江 524088
基金项目:广东海洋大学冲一流项目(231419018);创新强校工程项目(230420021);南方海洋科学与工程广东省实验室(湛江)资助项目(ZJW-2019-08)。
摘    要:选取湛江市霞山区观海长廊红树林湿地为研究区域,运用电感耦合等离子体质谱仪(ICP-MS)测定红树林表层土壤及红树植物根、枝、叶中重金属(铜Cu、锌Zn、铅Pb、镉Cd、铬Cr、镍Ni、砷As)的质量分数;运用Hakanson潜在生态风险指数评估红树林土壤的重金属污染风险水平,结合相关性分析和聚类分析探讨重金属的影响因素...

关 键 词:红树林  土壤  重金属  生物富集系数(BCF)  转运系数(TF)
收稿时间:2020-07-11

Enrichment and Migration of Heavy Metals in Mangrove Soil-Plant System from Sea Promenade in Zhanjiang
Li Zhenliang,Xie Qun,Zeng Zhen,Zhang Jibiao,Feng Yuming,Lai Yongping,Lin Lingling. Enrichment and Migration of Heavy Metals in Mangrove Soil-Plant System from Sea Promenade in Zhanjiang[J]. Tropical Geography, 2021, 41(2): 398-409. DOI: 10.13284/j.cnki.rddl.003320
Authors:Li Zhenliang  Xie Qun  Zeng Zhen  Zhang Jibiao  Feng Yuming  Lai Yongping  Lin Lingling
Affiliation:1.College of Chemistry and Environmental Science, Guangdong Ocean University, Zhanjiang 524088, China;2.Analytical and Testing Center, Guangdong Ocean University, Zhanjiang 524088, China;3.College of Management, Guangdong Ocean University, Zhanjiang 524088, China;4.College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China;5.Southern Laboratory of Ocean Science and Engineering, Zhanjiang 524088, China
Abstract:To explore the distribution,accumulation,and migration characteristics of mangrove soils and mangrove plants,the mass fraction of heavy metals(Cu,Zn,Pb,Cd,Cr,Ni,and As),the source thereof,and factors influencing their presence in the surface soil and different parts of mangrove plants(roots,branches,and leaves)were determined via inductively coupled plasma mass spectrometry(ICP-MS)in the Sea Promenade mangrove wetland in Xiashan District of Zhanjiang.The potential ecological risk index proposed by Hakanson was employed to evaluate the soil risk level.The influencing factors and sources of heavy metals were investigated using correlation and cluster analyses.The enrichment and migration ability of the heavy metals in soil plants were analyzed using the bioconcentration and translocation factors.The results showed that:1)The order of concentrations(in mg·kg-1)of seven heavy metals in surface soil of the mangrove wetland was Zn(57.48)>Cr(29.31)>Pb(19.23)>Cu(16.62)>Ni(8.18)>As(6.00)>Cd(0.20).Moreover,the average mass fraction of the seven elements did not exceed the risk screening values for soil contamination regarding soil environmental quality,according to the risk control standard for soil contamination of agricultural land(GB15618-2018)(pH≤5.5).The average values of Cu,Zn,Cd,and As were 2.08,2.74,6.75,and 1.11 times higher than the soil background values in Guangdong Province.Compared with the results of the investigation on heavy metals in 2015,the present results indicated increases in the concentrations of Cr,Cd,and Ni by 47%,32%,and 6%,respectively;conversely,the concentrations of Cu,As,Zn,and Pb decreased by 15%,14%,13%,and 3%,respectively.2)The highest potential ecological risk coefficient(Eir)values of Cd were in the range of 70-370,with an average value of 202,indicating a strong degree of potential ecological risk.The Eirvalues of the other elements were less than 40,indicating a slight degree of potential ecological risk.The mean value of the total potential ecological risk index(RI)of soil heavy metals investigated in the study area was 236,with a medium potential ecological risk degree.3)The correlation analysis of heavy metals and soil physical and chemical properties showed that,except for Cd and As,there was a significant positive correlation between the heavy metal and organic matter contents,while a correlation between heavy metals and pH was negative but not statistically significant.Heavy metals were positively correlated with clay and silt but negatively correlated with sand.Organic matter,pH,and particle size are important factors that affect heavy metal accumulation in soil.4)Concentrations of heavy metals in different mangrove plants were different.The order of heavy metal concentrations in Aegiceras corniculatum and Aegiceras corniculatum was Zn>Cr>Cu>Ni>Pb>As>Cd.The order of heavy metal concentrations in Sonneratia apetala was Zn>Cu>Cr>Ni>Pb>As>Cd.5)The bioconcentration and translocation factors of heavy metals were less than 1 in Aegiceras corniculatum,Sonneratia apetala,and Bruguiear gymnorrhiza,indicating that the enrichment and translocation capacity of heavy metals was not high,except for the root-leaf translocation factor of Zn in Sonneratia apetala,which was greater than 1.Most of the toxic heavy metals were mainly accumulated in the roots,which reduced the risk of their delivery by the food chain.
Keywords:mangrove  soil  heavy metal  Bio-Concentration Factor(BCF)  Translocation Factor(TF)
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