Effects of Nitrogen Fertilizer Forms on Growth and Pb Accumulation Characteristics of Picris japonica Thunb.
The pot experiments were performed to investigate the effects of nitrogen fertilizer forms（NH4^＋-N and NO3^--N） on growth and Pb accumulation characteristics of Picris japonica Thunb.under Pb stress（2 000 mg/kg）.The results indicated that,under the Pb stress,a moderate nitrogen fertilizer could be beneficial for the growth of Picris japonica Thunb.and its accumulation capacity for Pb.On the contrary,the growth of Picris japonica Thunb.and the Pb accumulation could be inhibited with an excessive nitrogen fertilizer.The Pb distribution in Picris japonica Thunb.was in the sequence of rootleafsteam with NH4^＋-N fertilizer.In contrast to the NO3^--N fertilizer,the application of NH4^＋-N fertilizer was more beneficial for transferring Pb to leaf.According to the results above,it was suggested that a suitable application of NH4^＋-N fertilizer（≤100 mg/kg）should be beneficial to enhance the biomass yield and Pb accumulation in Picris japonica Thunb.,which was positive for phytoremediation of Pb-contaminated soil.
forms of nitrogen fertilizerPbPicris japonica Thunb.phytoremediation
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NSTL
万方数据
维普
