年份 Year | 地点 Location | 最小值(mg/g) Minimum value (mg/g) | 最大值(mg/g) Maximum value (mg/g) | 极差(mg/g) Range (mg/g) | 平均数(mg/g) Average value (mg/g) | 标准差 Standard deviation | 变异系数(%) Coefficient of varation (%) |
2019 | 沅江 | 1.0834 | 3.2369 | 2.1535 | 2.2952 | 0.3814 | 16.62 |
2019 | 望城 | 1.0216 | 3.3315 | 2.3099 | 2.3015 | 0.3992 | 16.34 |
2020 | 沅江 | 0.9834 | 3.0396 | 2.0562 | 2.0115 | 0.3574 | 16.42 |
南通 | 1.0126 | 3.2153 | 2.2027 | 2.1139 | 0.3862 | 16.61 |