Element migration and accumulation characteristics of bedrock-soil-pineapple in main pineapple producing area of Zhanjiang City
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摘要: 为研究元素在基岩-土壤-作物系统的迁聚特征,选取湛江市徐闻县菠萝主产区为研究区,采集土壤和菠萝样品,结合元素迁移系数、生物富集系数评价了基岩-土壤-菠萝系统元素的分布和迁聚特征。结果表明: 研究区土壤含富磷(TP)、土壤全铁(TFe2O3)、Co、Ge、S、Se含量丰富,土壤全氮(TN)含量中等,有机质含量以中等—较丰富为主,土壤全钾(TK)含量缺乏。基岩风化成土过程中,土壤中Pb、Cr、TFe2O3、Ni相对基岩表现为富集,Al2O3、Cu、Zn、Co、Mn、TP、K2O相对基岩表现为流失; 土壤中Co、Cr、Cu、Ge、Mn、Ni、Zn主要来源于磁铁矿风化蚀变,Se主要来源于黄铁矿风化蚀变。菠萝果实对Cd、Hg为微弱吸收,Cd相对其他元素更容易在菠萝果实中富集。Ge、As、Cd、Se、Ni在菠萝根部最为富集,Pb、Hg、Cr、Cu、Zn在菠萝叶片最为富集,菠萝果实对Cu、Pb、Cr、Hg的吸收存在协同作用。研究成果可为当地菠萝产业发展提供依据。Abstract: The main pineapple producing area of Xuwen Country in Zhanjiang City was chosen as the study area to evaluate the elements migration and accumulate characteristics of bedrock-soil-crop system. The soil and pineapple samples were collected to evaluate the elements distribution, migration and accumulation characteristics, combining with the element migration coefficient and bioconcentration factor. The results indicate that the soil elements TP, TFe2O3, Co, Ge, S and Se were categorized as rich level, and TN content was categorized as moderate level, with moderate to relatively rich level of organic matter content and depleted TK content. The Pb, Cr, TFe2O3 and Ni in soil are relatively enriched in soil, and Al2O3, Cu, Zn, Co, Mn, TP and K2O are relatively lost during the weathering process of bedrock to soil. The Co, Cr, Cu, Ge, Mn, Ni and Zn in the soil are mainly derived from the weathering of magnetite, and Se is mainly derived from the weathering of pyrite. Cd and Hg were weakly absorbed by pineapple plants, while the Cd was easier to accumulate in pineapple fruits than other elements. Ge, As, Cd, Se and Ni were the most abundant in the roots of pineapple plants, and Pb, Hg, Cr, Cu and Zn were the most abundant in the leaves. There was a synergistic effect of pineapple fruits on the absorption of Cu, Pb, Cr and Hg.
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Key words:
- element migration /
- geochemistry /
- pineapple /
- Zhanjiang City
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