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Some uranium mining and metallurgy soil 226Ra background value can not be determined, because of historical background and decommissioning knowledge in the early year. Based on analyzing the influencing factors of soil 226Ra value, natural factors determine soil 226Ra background value and human factors cause the soil 226Ra value to rise. It is difficult to investigate soil 226Ra background value at the contaminated site. In order to reduce the influence of human factors, monitoring plan, minimum sample size, and investigation statistical method are researched from surrounding soil of the site. Based on an example of the uranium mining and metallurgy decommissioning site, the feasibility of the supplemental investigation method is verified. The investigation statistical method can provide support for the engineering design and practice of uranium mining and metallurgy decommissioning.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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