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The weathered soil profiles were taken as the research objects from paddy and upland fields, which are typical agricultural lands in the carbonate rock regions of South China. The sources of soil heavy metals were traced via Pb isotope composition, and the vertical distribution and influencing factors of eight common types of heavy metals in the farmland soil profiles were systematically analyzed. The results revealed that the weathering of parent rocks was the main source of soil heavy metals in the study area, and the contents of heavy metals in the two profiles were found to be higher than the soil background value (0.056mg/kg). The enrichment of Cd tended to occur in the surface layer (0.49~2.15mg/kg) and the middle layer(0.75~1.87mg/kg) of the soil profiles, while that of the other elements tended to occur in the middle layer. The physicochemical properties and the mineral compositions of the soils, as well as the changes in the redox conditions exerted important impacts on the migration of heavy metals. The secondary enrichment of heavy metals in the soil profiles from the study area was attributed to the weathering process of carbonate rocks, while the impact of the leaching process on the migration and enrichment of heavy metals was more significant in the profile from the paddy field.
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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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