以湘中某工矿区农田为研究对象，野外定点采集红壤和紫色土母质水稻土耕层土壤及其对应样点水稻分蘖期和成熟期样品，分别使用富集系数、迁移系数和累积系数研究了Pb在土壤?水稻系统中的迁移特征．结果表明，成熟期水稻各部位 Pb含量为根＞茎叶＞稻壳＞糙米，其富集系数分别为55．07％、8．13％、2．47％、0?10％；迁移系数分蘖期为0．034％，成熟期0．080％，成熟期高于分蘖期（P＜0．01），成熟期迁移系数紫色土高于红壤（P＜0．01）；糙米累积系数红壤为0．40％，紫色土0．27％，红壤大于紫色土（P＜0．05）．综上所述，Pb在红壤和紫色土母质以及水稻分蘖期和成熟期的迁移特征均表现出一定的差异，所以在进行稻田Pb环境管理时需要注意土壤母质和水稻生长时期特点．
In the present study, the rice plants containing samples of tillering and mature stage, and corresponding soil samples ( red and purple soils) were collected from the industrial and mining area in central Hunan Province. Then the transfer characteristics of Pb in soil?rice system were analyzed using enrichment coefficient, transfer coefficient and accumulation coefficient. The results showed that the concentration order of Pb in the different parts of mature rice was in the order of:root>stem leaf> chaff> brown rices and the enrichment coefficient was 55. 07%, 8. 13%, 2. 47%, 0. 10%, respectively. The transfer coefficient of rice plant in maturity stage was 0. 080%, which was significantly higher than that of tillering stage ( 0. 034%) , ( P<0. 01 ) . Moreover, the transfer coefficient of mature rice in purple soil was significantly higher than that in red soil. The accumulative coefficient of brown rice in red soil (0.40%) was significantly larger than that of purple soil (0.27%),(P<0.05). In conclusion, there were some differences in transfer characteristics of Pb in the soil?rice system between red and purple soil, tillering and mature stage of rice. So it needs to be differentiated according to the different soil parent material and rice growth period when making environmental management related to Pb contamination in paddy.
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