Water regulating effect on Jatropha curcas repair cadmium-contaminated soil
YANG Ying1, YANG Qiliang1*, WU Zhenzhong2, WANG Huanchang1
1.College of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; 2.College of Resource and Environment, Lanzhou University, Lanzhou, Gansu 730050, China
Abstract：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.
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