Assessment of Farmland Soil Pollution and Agricultural Functional Zoning in Liaocheng
We collected 74 topsoil samples during 2017～2020 to explore the pollution situation and agricultural function zoning in farmland soil in Liaocheng City,and analyzed the contents of 8 heavy metals(Cd,Hg,As,Cu,Pb,Cr,Zn and Ni),BHCs,DDTs and BaP.Based on the standards of"soil environmental quality—risk control standard for soil contamination of agricultural land"and"green food—environmental quality for production area",the pollution index method was used to evaluate the soil environmental quality and to research agricultural function zoning.ANOVA and LSD multiple comparison were adopted to determine the spatial distribution difference and the sources of the pollutants.Based on the soil background values of Shandong province,the potential ecological risk of heavy metals was evaluated.The results showed that there were 3 samples polluted by DDTs and 1 sample polluted by Cd,the others were at clean levels.DDTs and Cr contents presented extremely significant differences in spatial distribution,and BaP and Hg presented significant contents differences.The results of agricultural function zoning showed that the proportion of green food planting area,non-polluted food planting area,observed planting area and contaminated area were 78.13%,9.45%,6.52%and 5.90%respectively.77.03%of the total area presented a slight level of potential ecological risk,Hg and Cd account for a large proportion in the assessment,and should be highly vigilant and strictly regulated.
Heavy metalsorganic pollutantsslight contaminationecological risk assessmentagricultural function zoning
万方数据
维普
