中文摘要：

为了明确Cd对水稻孕穗期植株生长的影响及其在植株体内的积累分配特征,以水稻品种中优169为试材,通过盆栽试验,研究了土壤不同含量Cd对水稻孕穗期植株根系活力、干物质量以及Cd积累和分配的影响。结果表明：水稻孕穗期根系活力和器官干物质量均随土壤Cd含量的提高而降低,当Cd含量为5 mg/kg时,水稻根系活力和器官干物质量均受到明显抑制;随着Cd含量的提高,水稻根系和地上部的Cd含量以及积累量均明显增加;1 mg/kg的Cd处理下水稻根系Cd富集系数和分配比例下降,而转运系数以及地上部的富集系数和分配比例增加;5 mg/kg的Cd处理下水稻根系和地上部的Cd富集系数、转运系数以及地上部的Cd分配比例下降,而根系的Cd分配比例增加。较高程度的Cd污染,抑制了孕穗期水稻的生长。Cd污染增加了水稻各部位对Cd的积累,但高Cd污染时Cd向水稻地上部迁移与分配的能力会降低。

英文摘要：

In order to make clear the effect of Cd on plant growth and the accumulation and distribution characteristics of Cd in rice, the root activity,dry matter,accumulation and distribution of Cd in rice cultivar Zhongyou169 at booting stage were studied under different Cd concentrations by pot experiment. The results showed that the root activity and dry matter of rice decreased with the increase of Cd concentration. When the Cd concentration was 5 mg/kg, the root activity and dry matter of rice were significantly inhibited. With the increase of Cd concentration,the accumulation of Cd increased significantly in roots and shoots of rice. 1 mg/kg Cd decreased the enrichment coefficient and distribution ratio of Cd in rice roots,while it increased the transfer coefficient,enrichment coefficient and distribution ratio of Cd in shoots. 5 mg/kg Cd decreased the enrichment coefficient and transfer coefficient of Cd in rice roots and shoots,and distribution ratio of Cd in shoots,while it increased the distribution ratio of Cd in roots. High concentration of Cd inhibited the growth of rice. Cd pollution increased the accumulation of Cd in different parts of rice. Moreover,high Cd pollution reduced the capacity of transfer and distribution of Cd in shoots of rice.