TITLE:
Heavy Metal Characteristics and Comprehensive Quality Index Evaluation of Soil-Crop System in 11 Cities of Yunnan Province, China
AUTHORS:
Chunyu Dong, Min Zhang, Hao Zhang, Haichan Yang, Jiaqi Li, Fumin Tan, Xinxing Dong, Naiming Zhang, Li Bao
KEYWORDS:
Index of Compressive Quality, Heavy Metals, Soil-Crop System
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.10 No.4,
April
27,
2022
ABSTRACT: Yunnan province in China is a high background area of soil heavy metals,
and agricultural planting and industrial and mining activities are relatively
frequent, which aggravate soil heavy metal pollution. However,
at present, there are few reports on the overall or large-scale soil-crop pollution
and risk assessment of heavy metals in Yunnan Province. This
study through 11 cities in Yunnan province of China farmland soil-crop systems of heavy metal
lead, cadmium content, enrichment coefficient is analyzed, and using the method
of potential ecological harm index, index of compressive quality to evaluate
heavy metal pollution soil-crop system risk. Results
showed that the average content of soil heavy metal Cd and Pb were 1.31 mg/kg,
64.17 mg/kg, which are higher than the background value of Yunnan province. The average
contents of Pb and Cd in the edible parts of crops were 0.20 mg/kg, 0.08
mg/kg. The average content of heavy metals in crops in Diqing (Pb) and Nujiang
(Cd) was 0.72 mg/kg and 0.148 mg/kg. The enrichment coefficients of heavy
metals in edible parts of crops were the largest in Diqing (Pb) and Zhaotong
(Cd). The average value of ecological risk index of Pb element in soil is 2.79,
which indicates that the study area is in a slight ecological hazard, the
average value of the ecological risk index of Cd in soil is 126.43. The average
value of the comprehensive quality impact index (IICQ) is
4.27, which indicates that the study area is moderately polluted. In this
study, the contents of heavy metals Cd and Pb in soils and crops in different
administrative regions were determined, and the heavy metals Pb and Cd in
soil-crop system of Yunnan province, China
were evaluated, it is expected to have important scientific and theoretical
significance for the safe use of cultivated land to export safe agricultural
products and promote the sustainable development of agriculture in Yunnan
Plateau.