Leersia hexandra Swartz is the first wet Cr hyperaccumulator that discovered in China.A hydroponic experiment was conducted to investigate the the effect of humic acid on the plant biomass,the concentration and translocation factor of Cu and Ni in L.hexandra,as well as the heavy metal concentration of nutrient solution.The results indicated that appropriate humic acid promoted the increase of plant biomass.High concentration of humic acid inhibited the uptake of Cu and Ni,while low concentration of humic acid increased the metal uptake in L.hexandra.Humic acid increased the translocation factor of Cu and Ni.Low concentration of humic acid promoted the translocation factor of Cu and Ni better than high concentration of humic acid.L.hexandra mainly accumulated Cu in nutrient solution.
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