中文摘要：

在分析研究了约500套水稻籽实一耕层土及约300套小麦籽实一耕层土样品相关元素含量等地球化学调查数据基础上。报道了江苏典型地区水稻与小麦籽实中Cd、Hg、Cu、Pb、Zn、Cr、As、Se、Mo、Mn、Fe、K、Ca、Mg等14个元素的生物富集系数fBCF）分布状况，统计结果显示，各元素的BCF值差异较大，通常Pb、Cr、Fe等元素BCF多小于1％。Hg,As、Mn,Ca等元素BCF多为1％~10％，Mo的平均BCF最大、Fe的平均BCF最小。研究发现，水稻与小麦籽实中Pb与Cd超标率分别超过15％、6％。BCF值差异与稻谷、小麦的元素含量无直接关系，部分元素的BCF与土壤pH、TOC、CEC、B含量等具有统计上的相关性，其中土壤pH与Cd、Ca、Mg元素的BCF呈显著负相关，而土壤的有机碳含量、阳离子交换量及B含量等也对部分元素的BCF值有一定影响。

英文摘要：

On the basis of studying related geochemical data of element distribution in 500 sets of rice seed samples and the cultivated soil and 300 sets of wheat seed samples and the root soil from some typical areas of Jiangsu Province, this paper has reported the bioconcentration factors （BCF） of Cd, Hg, Cu, Pb, Zn, Cr, As, Se, Mo, Mn, Fe, K, Ca and Mg which are distributed in milled rice and wheatmeal. Statistical results show that there exist obvious differences in BCF of different elements：usually BCF of Pb, Cr, Fe etc. is lower than 1%, BCF of rig, As, Mn, Ca etc. is equal to 1% - 10%, the average BCF of Mo is the largest and the average BCF of Fe is the smallest. It is found that element content exceeds limited-standard in the studied milled rice or wheatmeal samples; for example , Pb content is 15% higher than the limited-standard proportion, and the Cd content is 6% higher than the limited-standard proportion. According to statistical data, there is not direct relationship between BCF distribution differences of related elements and element content exceeding the limited-standard within the above-stated milled rice or wheatmeal samples. Furthermore, it is pointed out that the controlling indicators of BCF distribution include probably soil pH, total organic carbon （TOC）, cation exchange capacity （CEC）, boron 03） concentration, and so on. There exists obvious negative correlation between the BCF of such elements as Ca and Mg and soil pH, and the correlated coefficient of the BCF of Cd versus soil pH is -0.94 related to the milled rice. The same environmental indicator in soil probably has different effects on BCF of different elements, their correlation can be positive or negative, but all correlations have to be set up with certain condition limits.