Effect of chicken manure compost on heavy metal morphology in agricultural soils
The problem of heavy metal pollution in agricultural soil in China is relatively prominent,which may have potential effects on human health and requires treatment.Chicken manure compost can not only improve soil fertility and increase microbial activity,but also reduce the bioavailability of heavy metals and reduce their pollution to the soil.This study investigated the effects of chicken manure compost on the total content and forms of heavy metals in soil,revealed the situation of heavy metals in agricultural soil after application of chicken manure compost,and clarified the hazards of chicken manure compost applied to soil.The results showed that the heavy metals Cu,Zn,and Pb in the soil samples increased by 2.7%,24.1%,and 0.3%respectively after the application of compost,which did not exceed the national standard.In addition,the combined form of Zn,Cu,and Pb bound by iron and manganese oxides decreased by 4.18%,10.25%,and 10.93%respectively,and the residual form of zinc,copper,and lead decreased by 18.25%,28.79%,and 39.02%respectively.After the appli-cation of chicken manure compost,the bioavailability α values of Zn,Cu,and Pb decreased from 0.84,0.93,and 0.75 in the control group to 0.65,0.64,and 0.36,respectively.Based on the above studies,it can be concluded that the conversion from organic bound state to residue state is conducive to reducing the ecological and environmental risk of heavy metals.
soilchicken manure compostforms of heavy metalsbioavailability
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NSTL
万方数据
