重金属Cu,Pb,Zn,Cr,Cd在水稻植株中的富集和分布

研究了外源可溶性重金属进入水稻土环境后，在水稻植株中的迁移、在水稻植株不同部位的分布及其分布随时间的变化。在水稻生长季节，重金属在水稻植株中迁移能力的大小依次为：Cd,Cr＞Zn,Cu＞Pb。重金属在水稻植株不同部位的积累分布是：根部＞根基茎＞主茎＞穗＞籽实＞叶部。水稻分蘖期重金属在根部、茎干部和叶片的积累量达到最大，随着时间的延长，在根部积累的重金属愈来愈少；在茎干部积累的重金属在拔节期降至最小，随后含量又稍微上升；叶片上的重金属含量在拔节期迅速下降，随后趋于稳定。

DISTRIBUTION AND ENRICHMENT OF HEAVY METALS OF Cu,Pb,Zn,Cr and Cd IN PADDY PLANT

After discharge of water soluble heavy metals of Cu, Pb, Zn, Cr and Cd to soil, the transportation, distribution and the variation of distributing concentration along with time in paddy were studied. The transportation sequence of five heavy metals was Cd, Cr>Zn, Cu>Pb. The concentration order of heavy metals in different parts of paddy was root>groundwork-stem>stem>fringe>grain>leaf. The concentration of heavy metals in root, stem and leaf reached the highest levels at time of paddy tillering. As time went on, the concentration of heavy metals decreased in root; the concentration of heavy metals in stem reached the lowest at the jointing growth period, and then increased slowly, the concentration of heavy metals in leaf was similar to that of stems, while after the time of upgraded growth, the concentration in leaf was stable.