摘要
在人工光照植物培养室中采用营养液培养方法，研究了不同镉浓度条件下，水稻根表沉积的铁氧化物及缺铁根分泌物对水稻吸收镉的影响．结果表明：（1）水稻根表沉积的铁氧化物对其生长介质中的镉有富集作用，并在一定程度上能促进水稻对匐镉的吸收。水稻生长的铁营养状况不同，则地上部镉含量不同，地上部镉含量达到最大峰值时根表铁氧化物的数量也不同。（2）当根表铁氧化物数量一定时，随着营养液中镉浓度的增大（镉的处理浓度为0、0．005、0．05、0．5mg／L），水稻根表镉富集量和植株地上部镉含量均呈增长趋势。（3）缺铁预培养的水稻地上部钢含量高于加铁预培养的植株，说明缺铁水稻根分泌物可促进镉的吸收，但生长介质中镉的处理浓度不同，根分泌物的作用程度不同。
Solution culture is conducted to investigate the effects of iron oxides and root exudates on cadmium uptake by rice. The results showed that iron oxides may absorb cadmium from nutrient solution. The amount of Cd accumulated on rice root surface increased with the increase in amount of deposited iron oxides. Therefore, iron plaque can influence the Cd uptake. When Fe nutritional status of rice are different, the effect of iron oxides on Cd uptake by the rice roots is also different. Generally, with the increase of Cd concentration in medium, the amount of Cd deposited on root surface and Cd content in rice shoot increased.Rice root exudates (PS) may mobilize Cd accumulated by iron oxides on the surface of rice root and significantly enhance Cd uptake in the fhizosphere. When Cd concentration in nutrient solution was different the effect of PS on Cd uptake was also different.
出处
《土壤学报》
CAS
CSCD
北大核心
1999年第4期463-469,共7页
Acta Pedologica Sinica
基金
国家自然科学基金!49501009
