Heavy Metal Characteristics and Comprehensive Quality Index Evaluation of Soil-Crop System in 11 Cities of Yunnan Province, China

Yunnan province in China is a high background area of soil heavy metals, and agricultural planting industrial mining activities are relatively frequent, which aggravate metal pollution. However, at present, there few reports on the overall or large-scale soil-crop pollution risk assessment metals Province. This study through 11 cities farmland systems lead, cadmium content, enrichment coefficient analyzed, using method potential ecological harm index, index compressive quality to evaluate system risk. Results showed that average content Cd Pb were 1.31 mg/kg, 64.17 higher than value province. The contents edible parts crops 0.20 0.08 mg/kg. Diqing (Pb) Nujiang (Cd) was 0.72 mg/kg 0.148 coefficients largest Zhaotong (Cd). element 2.79, indicates slight hazard, 126.43. comprehensive impact (IICQ) 4.27, moderately polluted. In this study, soils different administrative regions determined, province, evaluated, it expected have important scientific theoretical significance for safe use cultivated land export products promote sustainable development agriculture Plateau.