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现代地质 ›› 2018, Vol. 32 ›› Issue (06): 1292-1301.DOI: 10.19657/j.geoscience.1000-8527.2018.06.17

• 地球化学 • 上一篇    下一篇

赣南地区土壤硒元素地球化学特征及其影响因素研究:以青塘—梅窖地区为例

周墨(), 陈国光, 张明, 湛龙, 梁晓红, 张洁, 孙众从, 雍太健, 唐志敏   

  1. 中国地质调查局 南京地质调查中心,江苏 南京 210016
  • 收稿日期:2018-04-03 修回日期:2018-06-11 出版日期:2018-12-10 发布日期:2018-12-20
  • 作者简介:周 墨,男,助理工程师,硕士,1989年出生,地球化学专业,主要从事生态地球化学研究。Email: zhoumo407@126.com
  • 基金资助:
    中国地质调查局项目“海峡西岸经济区土地质量地球化学调查”(DD20160321)

Geochemical Characteristics and Influencing Factors of Selenium in Soils of South Jiangxi Province:A Typical Area of Qingtang-Meijiao

ZHOU Mo(), CHEN Guoguang, ZHANG Ming, ZHAN Long, LIANG Xiaohong, ZHANG Jie, SUN Zhongcong, YONG Taijian, TANG Zhimin   

  1. Nanjing Center of China Geological Survey,Nanjing,Jiangsu 210016,China
  • Received:2018-04-03 Revised:2018-06-11 Online:2018-12-10 Published:2018-12-20

摘要:

以赣南青塘—梅窖地区为典型区开展详细的调查研究工作,共采集了表层(0~20 cm)土壤样品889件,农作物样品72件。系统地分析了土壤及农作物中硒元素含量的空间分布特征及其与成土母质、土地利用类型和土壤理化性质的关系。结果表明:研究区土壤硒平均含量为0.44 mg·kg-1,其中面积比例为48.59%的土壤硒含量处于足硒状态,面积比例为42.86%的土壤硒含量处于富硒状态。在空间分布上,缺硒和潜在硒不足土壤仅呈零星分布。表层土壤硒含量在一定程度上继承了成土母质硒的含量,不同的土地利用类型土壤中硒含量也存在一定的差异。土壤有机质含量与硒含量呈显著正相关关系,与土壤pH值没有相关性。花生和水稻富硒率较高,其中花生和早稻含量均符合国家食品安全标准,仅晚稻存在一定的重金属超标现象。通过对比富硒土壤和不富硒土壤中晚稻重金属含量的超标率、硒的富集系数和含量,发现在富硒区晚稻中重金属的超标率远远低于非富硒区,说明土壤硒元素会在一定程度上降低晚稻中重金属元素的富集效应。

关键词: 赣南, 土壤, 硒含量, 地球化学分布特征, 影响因素

Abstract:

A detailed investigation of selenium concentration and distribution in the soil was carried out in Qingtang-Meijiao area, South Jiangxi Province. 889 topsoil (0-20 cm) samples and 72 crop samples were collected. We systematically analyzed the distribution of selenium in the soils and crops, the relation between the distribution characteristics and soil parent materials, land-use type, physical and chemical properties of soils. Results of the analysis show that the average contents of soil selenium in the study area was 0.44 mg·kg-1, including 48.59% in sufficient selenium state, and 42.86% in rich selenium state. In spatial distribution, the area which showed deficiency or potentially insufficient of selenium is only sporadically distributed. The contents of selenium in topsoil inherited the soil parent material partly. Furthermore, the concentrations varied in diffe-rent land use types. Correlation analysis showed that selenium contents in soils had a significant positive correlation with organic material and a faint correlation with pH value. Peanut and rice have higher selenium enrichment rates. The rich selenium rates of the peanut and the early season rice both meet the national food safety standards. Only late season rice expressed excessive heavy metals. By comparing data, we found that the over-standard rate of heavy metals in late season rice collecting from selenium-rich areas was far lower than those from non-selenium-rich areas. It is indicated that the selenium in soils can partly reduce the enrichment effect of heavy metal elements in late season rice.

Key words: South Jiangxi Province, soil, selenium concentration, geochemical distribution characteristics, influence factor

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