摘要
在福建省9个地区采集19个籼稻(常规籼稻、二系杂交籼稻、三系杂交籼稻)品种的283个稻米和表层土壤样品,研究了汞在不同籼稻品种糙米中累积的差异性。结果显示:土壤样品总汞含量范围介于0.02~1.81 mg·kg-1,其中超过国家土壤二级标准的占37%;供试水稻糙米汞含量的范围为0.13~41.78μg·kg-1,其中3.2%的水稻糙米超过了国家食品污染物限量标准(GB 2762—2012)。大部分供试糙米汞含量与土壤总汞及有效汞含量之间没有显著相关。杂交籼稻与常规籼稻糙米汞含量之间没有显著差异(P>0.05),三系杂交籼稻糙米汞含量高于两系杂交籼稻,但也没有显著差异(P>0.05),两系杂交籼稻对土壤汞的富集能力均低于三系杂交籼稻。两系杂交籼稻是籼稻中对汞累积相对较低的品系。
Different plants have showed various abilities to accumulate heavy metals from soils. In this study, 283 rice grain samples of 19 indica rice cultivars(including conventional, two-line hybrid and three-line hybrid indica rices)and 283 corresponding surface soils were collected from 9 districts of Fujian Province. Mercury(Hg)concentrations in both rice grains and soils were determined. Total soil Hg con-centrations varied from 0.02 mg·kg-1to 1.81 mg·kg-1, of which 37% samples contained Hg exceeding the secondary level limit of the National Soil Environmental Quality. The Hg concentrations in brown rice grains ranged from 0.13 μg·kg-1to 41.78 μg·kg-1, of which only3.2% samples contained Hg greater than the limit of the National Standards for Pollutants in Food(GB 2762—2012). There was no significant correlation between Hg concentrations in brown rice and total or available Hg in soil. No significant difference in Hg concentrations of brown rice between hybrid and conventional indica rice(P>0.05)was observed. Brown rice Hg content in three-line hybrid indica cultivars was higher than that in two-line hybrid indica cultivars, but the difference between them was not significant(i.e., P>0.05). Two-line hybrid indica rice cultivars showed lower Hg accumulating capability than three-line hybrid indica rice did. The present results indicate that twoline hybrid indica rice is the strain of low Hg accumulation.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2015年第5期824-830,共7页
Journal of Agro-Environment Science
基金
国家自然科学基金(u1305232)
关键词
糙米
富集
籼稻
汞
土壤
brown rice
accumulation
indica rice
mercury
soil
