| The development of the Dictyophora indusiata?Vent.ex Pers?Fisch industry is becoming increasingly prominent today,but with the development of the industry,heavy metal pollution in the Dictyophora indusiata?Vent.ex Pers?Fisch substrate soil is becoming increasingly serious.Therefore,it is urgent to repair the contaminated soil.Solidification and stabilization technology is an effective method to control heavy metal pollution and soil control.Scholars at home and abroad have paid attention to the screening and research and development of improver,but there is not much research on tracking and monitoring the restoration efficiency of modifiers,and less research has been conducted on the stabilization effects of various he avy metals on edible fungus substrate soil after restoration.Based on this,this parper uses stabilization technology to study the effect of calcium carbonate improver on the heavy metal restoration of Dictyophora indusiata?Vent.ex Pers?Fisch planting soil.Analysis of CaCO3 improver at different concentrations on the biomass of Dicty ophora indusiata?Vent.ex Pers?Fisch,the heavy metal content in the soil and the fruit bodies of Dictyophora indusiata?Vent.ex Pers?Fisch,the distribution of the heavy metals?Cd,Pb,Cu,Zn,Ni,Cr?in the soil,the bioavailability and the soil Basic physical and chemical properties.It provides a theoretical basis for the treatment ofheavy metal contaminated soil with stabilization technology and the treatment of heavy metals in Dictyophora indusiata?Vent.ex Pers?Fisch-based soil.The main research contents and results are as fol lows:1?The matrix soil Cr,Cu,and Zn in the experimental area all accumulate,each of which exceed 1.32,3.53,and 1.27 times the soil background values of Guizhou.Cd exceeds the national standard screening value and there is a risk of pollution.Cd enrichment is most severe in Dictyophora indusiata?Vent.ex Pers?Fisch,exceeding the national food safety standard for food products by a limit of7.04 times.Pb,Cu,Zn,Ni,and Cr are enriched to varying degrees in Dictyophora indusiata?Vent.ex Pers?Fisch.The CDI health risk assessment shows that Cd has a health hazard risk in adult edible test areas,which is negligible by the health hazards of Cr,Cu,Zn,Pb,and Hg.Children are mainly exposed to the health hazard risks of Cd and Cu and the harm of Cu and Pb in the edible fungus skirt.In the edible test area,the health hazards of As exist in the fungus skirt,skirt support and stalk.The health hazards of Cd existed in the edible fungus cap.2?After adding calcium carbonate improver,compared with the CK group,T2?T10 all increased production,the yield increased between 3?18 strains/frame.When the calcium carbonate added concentration is 8 ?9 g/kg,the effect of increasing production reached its peak.The soil pH and electrical conductivity of T1?T10 group substrates shows a gradient increase with the concentration of calcium carbonate,and the increase ranges of pH and electrical conductivity are 0.36?1.34 units and 132.20?451.33 u S·cm-1.When the amount of calcium carbonate reached 8 g/kg,the matrix soil became alkaline?PH>7?.There was no significant difference in the organic matter content of the T1?T10 groups?P>0.05?.The calcium carbonate improver has little effect on the organic matter content.3?Different concentrations of calcium carbonate improvers can effectively reduce the total amount of Cd in the soil of Dictyophora indusiata?Vent.ex Pers?Fisch,but have no significant effect on the total amount of Pb,Cr,Ni,Cu,Zn,Hg,and As.Calcium carbonate additive has an effect on the enrichment capacity of the heavy metal of the Dictyophora indusiata?Vent.ex Pers?Fisch,and the order of the largest decrease rate is Cd>Hg>As>Ni>Zn>Cu>Pb>Cr.The effect of Cd is the most significant?45.68%?191.90%?,and the maximum reduction rate of Cr is only 1.19%.Therefore,it has little effect on the change of Cr enrichment capacity of Dictyophora indusiata?Vent.ex Pers?Fisch.In terms of the probability that a single heavy metal exceeds the CK in the T1?T10 experimental group,Zn?30%?<Hg?40%?<As?60%?=Cu?60%?<Cr?70%?<Ni?80%?<Cd?100%?=Pb?100%?.The eight heavy metals concentrations shows a tendency to decrease in the T2 and T10 groups,and the enrichment ability of Dictyophora indusiata?Vent.ex Pers?Fisch in the T10 group was relatively lower.4?The analysis results of the factors of the exchange states of Pb,Cd,Cr,Ni,Cu,and Zn in the T1?T10 group and the CK group shows significant differences?P<0.05?,except that the Cr point was slightly increased after T4 treatment.In the experimental group,the exchange rate distribution rate of Pb,Cd,Cr,Ni,Cu,and Zn in the soil all decreased,which respectively decreased by 84.2%?99.63%,49.50%?94.83%,41.87%?97.37%,4.30%?98.26%,92.59%?99.99%,67.22%?98.46%.5?The carbonate binding states of Cd,Cr,Ni,Cu shows significant differences between the experimental groups?P<0.05?.The calcium carbonate binding states of Pb only in the T2 group and Zn only in the T5 group are significantly different from those in the CK group?P<0.05?.The combined state of Pb,Cd,Cr,Ni,Cu,and Zn carbonates shows an upward trend after the addition of calcium carbonate improvers,and the increase times are respectively 0.002?0.036,7.30?14.12,10.62?1.27,3.51?8.30,5.87?11.36,4.63?10.31.6?From the point of view of the oxidation state content of heavy metals,iron and manganese,the average distribution rates of Pb,Cd,Cr,Ni,Cu,and Zn iron and manganese oxidation states of the experimental group and CK are 0.075±0.009,0.15±0.03,0.11±0.01 0.09±0.02,0.047±0.005,0.09±0.01.The differences between the experimental groups are below the order of 10-2,indicating that the overall influence of calcium carbonate on the oxidation state of iron and manganese in the matrix soil is small.7?Only Zn in the T7 group,Cd in the T1 group shows a significant difference in organic binding state,and Pb,Cr,Ni,Cu all have a significant difference of more than 50%.When the addition amount of calcium carbonate is 6 and 9 g/kg,the organic binding state of each element is not significantly different from that of the CK group?P>0.05?.The calcium carbonate improver has a certain effect on the change of the organic binding state of heavy metals in the soil,but the effect is only part of the calcium carbonate concentration.The organic binding states of Pb,Cd,Cr,Ni,Cu,Zn to achieve the passivation effect are: 7,3,8,10,8,7 respectively.The calcium carbonate concentration of 1?10 g/kg can achieve the passivation effect on the organic binding state of Ni,but only 3 concentrations to passivate the organic binding state of Cd.8?The passivation effect of calcium carbonate improver on soil residue state is: Ni> Cu> Cr> Pb> Zn> Cd.Calcium carbonate improver makes it easier for Ni to be converted into residue state,but the effect is not obvious for Cd.When the calcium carbonate concentration is 4 g/kg,it is easier to convert the residual state of Cu,Cr,Pb,Zn,and Cd to other active states. 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