利用Tessier连续提取法对粤北上坝村稻田土壤中重金属化学形态分布特征进行研究,同时调查稻田间隙水中重金属的污染状况.结果表明,研究区域稻田土壤中Cu超标严重,主要以稳定态的形式存在,环境迁移量相对较少;土壤中Zn的生物有效性最低,Cd污染达到中等水平,其生物有效性最高;可交换态Mn,碳酸盐结合态Cd及铁锰氧化物结合态的Mn、Pb、Zn的占比较高,对农业生产环境具有一定的潜在威胁.稻田间隙水中Cd含量超标1.8倍.%In this paper , heavy metal pollution situation in the porewater was studied by Tessier method for exploring the species distribution of heavy metals in paddy soil from Shangba village in northern Guangdong .The results indicated that the concentration of Cu was much higher than the secondary standards of soil environmental quality and it presented mainly in stable species , as well as the environmental migration was relatively low .The bioavailability of Zn in paddy soil was the lowest .Cd reached to moderate pollution level and its bioavailability was the highest .The percentage of water soluble form of Mn , carbonate-bound form of Cd and Fe-Mn-oxide-bound form of Mn, Pb, Zn were high, which were a potential threat to agricultural production environment .The concentration of Cd in porewater was 1 .8 times over the standard limit of irrigation water quality .
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