小桐子修复镉污染土壤的水分调控效应

通过温室盆栽试验研究了小桐子幼树在不同灌水上限(W1:30%FC,W2:50%FC,W3:70%FC,W4:90%FC)和镉质量比(Cd0:0 mg/kg,Cd1:50 mg/kg,Cd2:100 mg/kg,Cd3:200 mg/kg)下的生长状况、灌溉水利用效率(WUE)及小桐子富集镉的特征.结果表明:小桐子体内镉的富集量随着镉质量比的增加而增大(P<0.01),而小桐子的生长、土壤镉转移系数(TF)、生物富集系数(BF)和灌溉水利用效率均随着镉质量比的增加而下降(P<0.05).小桐子体内镉的富集量,TF,BF均随着灌水量的增加呈现出先增大后减小的趋势,其各器官富集镉的能力由高到低依次为根系、茎杆、叶片.在本研究条件下,有利于小桐子修复镉污染土壤的最佳灌水量和镉质量比组合为W3Cd1.

Water regulating effect on Jatropha curcas repair cadmium-contaminated soil

The growth status of Jatropha curcas saplings at different irrigation treatments(W1:30%FC,W2:50%FC,W3:70%FC,W4:90%FC)and cadmium mass ratio(Cd0:0 mg/kg,Cd1:50 mg/kg,Cd2:100 mg/kg,Cd3:200 mg/kg), irrigation water use efficiency(WUE)and the characteristics of cadmium enrichment of Jatropha curcas were studied through the greenhouse pot experiment.The results show that cadmium content increases with the increase of cadmium mass ratio(P <0.01), while with the increase of cadmium mass ratio, soil cadmium transfer coefficient(TF), bioaccumulation coefficient(BF)and WUE decrease(P <0.05).The content of cadmium, TF and BF in Jatropha curcas increases first, then decreases with the increase of irrigation amount, and the ability of its organs to enrich cadmium in sequence from high to low is root,stem,leaf. Under the conditions of this study, the optimum combination of irrigation and cadmium mass ratio is beneficial to W3Cd1.