南宁市典型耕地区水稻籽实微量元素生物富集差异分析

Difference analysis of bioconcentration of trace elements in rice seeds in typical cultivated areas of Nanning

通过分析南宁典型耕地区557套水稻籽实及根系土相关元素含量,计算水稻籽实中As、B、Cd、Cr、Cu、Hg、Mo、Ni、Pb、Se、Zn等11项元素的生物富集系数显示:早稻及晚稻籽实之间,早晚稻根系土之间元素含量相差较小,各元素富集能力有一定差异,Mo、Cd、Zn、Se元素的生物富集能力最强,其中Mo元素BCF大于50%;As、Cr、Ni、Pb元素最小,BCF小于1%。金属元素超标率与BCF之间无明显相关性。土壤中Mo、Zn含量与水稻籽实中As、Cu、Cr的BCF,土壤中Mo、P、Zn含量与水稻籽实中Mo、Zn的BCF之间均呈现一定的负关联性。

The contents of related elements in 557 sets of rice seeds and root soils in typical cultivated areas of Nanning were analyzed. The bioaccumulation coefficients of As, B, Cd, Cr, Cu, Hg, Mo, Ni, Pb, Se and Zn in rice seeds were calculated. The results showed that the there is little difference of elements contents between early and late rice seeds, and so is that between early and late rice root soils. There are some differences in the accumulation ability of each elements. Among them,the bioaccumulation ability of Mo, Cd, Zn and Se is the strongest. BCF of element Mo is more than 50%. As, Cr, Ni and Pb are the smallest and their BCF is less than 1%. There is no significant correlation between the standard-above rate of heavy metals and BCF. There is a negative correlation among the contents of Mo and Zn in soil and BCF of As, Cu and Cr in rice seeds. The same happens among the contents of Mo, P and Zn in soil and BCF of Mo and Zn in rice seeds.