Effects Of Liming On Soil Heavy Metal Activity And Soil Fertility Of Phyllostachys Praecox Stands

In this study,Phyllostachys praecox stands with heavy acidification were treated with various liming amounts.Soil and bamboo leaf samples were collected for the evaluation of the influence of the liming measurement.Six heavy metals?Cu,Zn,Pb,Cd,Cr,Ni?and four mineral elements?K,Na,Ca,Mg?were measured in the samples.Soil heavy metal pollution was assessed and mineral element change was compared.The effects of liming on soil heavy metal pollution and soil fertility were discussed.The obtained results were listed as follows.1.According to the single factor pollution index method,the bamboo soil was polluted moderately by Cu,slightly by Pb and not polluted by the other heavy metals.Results with the potential ecological risk method showed that the bamboo soil was in a safe state with a low risk of heavy metal pollution.2.Treated with the liming measurement,soil pH increased with the liming rate significantly.At the same time,soil mineral element content in soil increased as well,suggesting that soil nutrient availability was improved with the liming measurement.3.The contents of available heavy metals were decreased significantly treated with liming.Moreover,heavy metals were changed from humic acid to Fe/Mn oxide forms.Accordingly,the liming measurement decreased significantly the heavy metal bio-availability.4.Results showed that the content of heavy metal in new fresh leaf decreased greatly,while the mineral element increased significantly.However,the effect was not significant when the liming rate was more than 0.8 kg·m^-2.