## 3 Results  
### Statistical Characterization of the Meta-Content of the Selected Heavy Metal(oids) in Soil Samples  
The mean soil pH was 7.8 and 9.02 for construction and agricultural lands, respectively (Table 2). The average heavy metal(loid) content in the surface soil was in the order of Pb \(>\) Zn \(>\) Cu \(>\) As \(>\) Cd \(>\) Ni \(>\) Hg \(>\) Cr for construction land and Zn \(>\) Cu \(>\) Cr \(>\) Pb \(>\) Ni \(>\) As \(>\) Cd \(>\) Hg for agricultural land.  
The coefficients of variation (Cv) [29] of As, Hg, Cd, Pb, Cu, and Zn in construction land were all \(>\)1, which is an anomalously strong variation, indicating that they are greatly influenced by human activities. Cd content was significantly higher than the background value in Kunming [30]. The Cv values of the contents of Hg, Cd, and Pb contents in  
\begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline
**Land Use** & & & & & & & & & & & \\
**Patterns** & & & & & & & & & & \\ \hline \multirow{6}{*}{construction land} & Max. & 9.11 & 1912.00 & 18.40 & 1208.00 & 6484.00 & 93.40 & 3429.00 & 7455.00 & 1.40 \\  & Min. & 5.23 & 14.70 & 0.06 & 0.61 & 43.30 & 19.40 & 48.20 & 63.70 & 0.50 \\  & Avg. & 7.80 & 423.72 & 3.23 & 92.15 & 1153.11 & 60.21 & 692.78 & 1136.99 & 0.87 \\  & SD & 0.90 & 555.37 & 4.86 & 259.33 & 1561.01 & 18.48 & 909.51 & 1664.64 & 0.27 \\  & CV & 0.12 & 1.31 & 1.51 & 2.81 & 1.35 & 0.31 & 1.31 & 1.46 & 0.31 \\ \hline \multirow{6}{*}{agricultural land} & Max. & 9.46 & 38.40 & 0.50 & 7.85 & 298.00 & 74.40 & 249.00 & 388.00 & 129.00 \\  & Min. & 6.05 & 11.20 & 0.05 & 0.69 & 35.60 & 22.40 & 43.20 & 111.00 & 51.10 \\ \cline{1-1}  & Avg. & 8.02 & 23.08 & 0.16 & 2.29 & 76.61 & 45.40 & 141.10 & 206.38 & 80.57 \\ \cline{1-1}  & SD & 0.54 & 7.11 & 0.10 & 1.45 & 43.01 & 13.96 & 64.23 & 65.96 & 15.08 \\ \cline{1-1}  & CV & 0.07 & 0.31 & 0.63 & 0.63 & 0.56 & 0.31 & 0.46 & 0.32 & 0.19 \\ \hline \multirow{6}{*}{Upper Crustal Mean (UCC)} & & & & & & & & & & & \\ \cline{1-1}  & construction land & & & & & & & & & & \\ \cline{1-1}  & & & & & & & & & & & \\ \cline{1-1}  & agricultural land & & & & & & & & & \\ \cline{1-1}  & land & & & & & & & & & & \\ \hline \multirow{6}{*}{screening value} & construction land & & & & & & & & & & \\ \cline{1-1}  & & & & & & & & & & & \\ \cline{1-1}  & & & & & & & & & & & \\ \cline{1-1}  & & & & & & & & & & & \\ \cline{1-1}  & & & & & & & & & & & \\ \hline \hline \end{tabular}
\end{table}
Table 2: Heavy metal(loid) contents and soil statistical characteristics.  
the agricultural soils were >0.5, which also indicated strong variation. Relative to the background values in Kunming and the contents of the upper crust [31], the study area was significantly enriched in Cd (1023.89 times). All elements exceeded the background values in the agricultural land in Kunming, except for Cr (the data were logarithmically (In) treated to observe subtle changes in heavy metal(Ioid) content data in a more subtle manner considering that the data differed too much) (Figure 2).  
A comparison of the screening values (Table 2) revealed certain points in the soil samples where different heavy metal(Ioid) concentrations were exceeded. In the 20 sample points of the construction land soil, the contents of As, Cd, and Pb exceeded the standards in 14 (70%), five (25%), and eight (40%) samples, respectively. The concentrations of Cd, As, and Cu in the 40 soil sample points on the agricultural land exceeded the standards in 40 (100%), 22 (55%), and 25 (62.5%) samples, respectively. In these soil samples, Zn and Pb exceeded the relevant standards in only 15% and 2.5%, respectively. None of the remaining heavy metal(Ioid)s exceeded the relevant standards.