Ecological risk assessment of soil cadmium in China’s coastal economic development zone: a meta-analysis

Figures & data

Figure 1. The location of the study area

Table 1. Classification criteria of the potential ecological risk index $\left({\mathrm{E}}_{\mathrm{r}}^{\mathrm{i}}\right)$

${\mathrm{E}}_{\mathrm{r}}^{\mathrm{i}}$	Degree of ecological risk of a single pollutant
${\mathrm{E}}_{\mathrm{r}}^{\mathrm{i}}$ < 40	Low
40 ≤ ${\mathrm{E}}_{\mathrm{r}}^{\mathrm{i}}$ < 80	Moderate
80 ≤ ${\mathrm{E}}_{\mathrm{r}}^{\mathrm{i}}$ < 160	High
160 ≤ ${\mathrm{E}}_{\mathrm{r}}^{\mathrm{i}}$ < 320	Slightly heavy
${\mathrm{E}}_{\mathrm{r}}^{\mathrm{i}}$ ≥ 320	Heavy

Figure 2. Spatial distribution of the Cd concentration in the soil in China’s coastal areas

Table 2. Statistical analysis of Cd concentration in coastal economic development zone of China

Provinces	Number of districts or counties	Maximum value (mg/kg)	Minimum value (mg/kg)	Median value (mg/kg)	Arithmetic mean (mg/kg)	Geometric mean (mg/kg)	Variable coefficient
Liaoning	20	4.22	0.11	0.23	0.66	0.34	1.64
Beijing	11	2.59	0.14	0.25	0.98	0.52	0.97
Tianjin	7	1.41	0.27	0.43	0.66	0.55	0.64
Hebei	26	2.54	0.07	0.18	0.36	0.23	1.44
Shandong	43	3.10	0.04	0.13	0.31	0.17	1.74
Jiangsu	47	35.75	0.01	0.19	1.08	0.21	4.79
Zhejiang	50	90.30	0.01	0.32	3.89	0.41	3.62
Shanghai	10	0.71	0.11	0.20	0.27	0.23	0.64
Fujian	29	2.84	0.01	0.20	0.34	0.21	1.48
Guangdong	21	2.96	0.02	0.86	1.11	0.61	0.85
Guangxi	17	4.86	0.06	0.63	1.59	0.75	1.08
Hainan	19	0.71	0.02	0.09	0.20	0.10	1.10

Figure 3. Distribution of Cd in the soil of key areas

Figure 4. The ecological risk of Cd pollution under the methods of the single factor index and potential ecological risk index (${\mathrm{E}}_{\mathrm{r}}^{\mathrm{i}}$)

Figure 5. Distribution of ecological risk under the species sensitivity distribution (SSD) method

Figure 6. Probabilistic ecological risk at the LC/EC/IC₅₀ level

Figure 7. Probabilistic ecological risk at the NOEC/LOEC level