摘要：分别以青椒为供试蔬菜、以Cd为供试重金属,采用盆栽试验探索相同规格根际调控基质块中添加不同剂量的碳酸轻稀土对青椒生长、Cd吸收和在器官分配的影响,为今后复合根际修复技术的开展提供理论和实践依据。结果表明:当稀土剂量为40 mg·kg-1时,与不添加稀土的对照相比,极大地促进了青椒苗株高和干重的增加,它们分别提高了21.52%和11.11%。在土壤中含量为5.19 mg·kg-1的Cd胁迫下,保留基质块处理比冲掉块(裸栽)处理的植株地上部干重、生物量、果干重均显著增加,而对根系却没有明显的促进作用。不管基质块中添加不添加稀土,此浓度的Cd胁迫显著抑制了植株根系生长。但适当的稀土添加能够在基质块缓解Cd对青椒毒害的基础上使青椒的生理状况得到进一步改善,而对植株产果没有显著的促进作用。结果还表明:任何剂量的稀土添加对根系Cd含量没有显著降低作用。而当稀土剂量为10 mg·kg-1时,虽然显著促进了茎、叶中Cd的含量,但也显著降低了果实中Cd的含量。由于果实是食用器官,这些结果支撑了稀土添加到基质块作为根际调控方法具有应用价值的重要依据。本试验为以后系统开展复合根际重金属调控研究奠定了基础。

摘要：污染土壤修复一直是科学家高度关注的问题。目前通常采用的是物理、化学和生物修复方法，但上述方法都有一定局限。为了探索新的方法技术，为根际调控修复污染农田提供技术和实践依据，采用4种不同规格基质块（直径X厚度分别为50mmx20mm、35mmx20mm、50mmx25mm、65mm20mm，质量分别为40．0、19．6、50．0、67．6g）与含5．19mg·k—cd的土壤组合成5个处理的盆栽试验，探索不同规格根际调控基质块对玉米生长及cd吸收的影响，进行基质块根际调控阻抗重金属研究尝试。结果表明，体积和质量最大基质块处理5比其他处理显著促进了玉米地上部生长，同时，该处理的总根系干重、块内和块外根系干重也显著高于其他处理。与不用基质块的处理1（cK）相比，应用基质块的玉米地上部cd含量降低了11．5％～46．3％、根系降低了1．19％．56．0％，只有处理5的玉米地上部cd含量显著下降。试验结果还表明，根际调控需要适当调节空间，验证了本科研组提出的重金属根际调榨拮术的可行性以及实际应用的可操作性。

摘要：[Objective] The aim was to research effects of substrate complexing light rare earth on growth, Cd absorption and organ distribution of sweet pepper to pro- vide references for development of rhizosphere regulation products in farmland seri- ously polluted. [Method] In the test, effects of substrate cakes （at the same size） and light rare earth （in different doses） on growth, Cd absorption and distribution of green peppers under stress from Cd were explored with a pot experiment. [Result] When 40 mg/kg of rare earth was added into a substrate cake, plant height of pep- per seedlings and the dry weight increased by 21.52% and 11.11%, compared with control group; when Cd was at 5.19 mg/kg （a highly graded pollution）, the shoot biomass, olant biomass and dry weight of fruits all enhanced significantly, but root system changed little in the groups where substrate cakes were saved, compared with the group where the substrate cake was washed away. No matter RE was added into substrate cakes or not, root system was significantly inhibited by Cd stress （5.19 mg/kg）, but RE at proper dose improved growth of green pepper and had little effect on fruit yielding. In addition, RE had little inhibition on Cd content in roots. RE at 10 mg/kg promoted Cd contents in stems and leaves, but reduced the content in fruits substantially. The regressive equation of Cd content and rare dose in leaves was as follows： y=4E-05x%0.009 6x＋0.655 6, FF=0.542 6; the regression equations of Cd content in root, stem and fruit did not make sense. [Conclusion] The experiment lays foundation for further research on heavy metals rhizosphere complexing controlling.