Details

Autor(en) / Beteiligte

• Mu, Demiao
• Zheng, Shunan
• Lin, Dasong
• Xu, Yingming
• Dong, Ruyin
• Pei, Penggang
• Sun, Yuebing

Titel

Derivation and validation of soil cadmium thresholds for the safe farmland production of vegetables in high geological background area

Ist Teil von

• The Science of the total environment, 2023-05, Vol.873, p.162171-162171, Article 162171

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2023

Quelle

MEDLINE

Beschreibungen/Notizen

• Excessive dietary intake of cadmium (Cd) poses toxicity risks to human health, and it is therefore essential to establish accurate and regionally appropriate soil Cd thresholds that ensure the safety of agricultural products grown in different areas. This study investigated the differences in the Cd accumulation in 32 vegetable varieties and found that the Cd content ranged from 0.01 to 0.24 mg·kg−1, and decreased in the order of stem and bulb vegetables > leafy vegetables > solanaceous crops > bean cultivars. A correlation analysis and structural equation model showed that pH, soil organic matter, and the cation exchange capacity had significant effects on Cd accumulation in the vegetables and explained 72.1 % of the variance. In addition, species sensitivity distribution (SSD) curves showed that stem and bulb vegetables were more sensitive to Cd than other types of vegetables. Using the Burr Type III function for curve fitting, we derived Cd thresholds of 6.66, 4.15, and 1.57 mg·kg−1 for vegetable soils. These thresholds will ensure that 20 %, 50 %, and 95 % of these vegetable varieties were risk–free, respectively. The predicted threshold of soil Cd was more than twice that of China's current National Soil Quality Standard (GB 15618–2018) for Cd values. Therefore, soil scenarios and cultivars should be considered comprehensively when determining farmland soil thresholds. The present results provide a new model for setting soil Cd criteria in high geological background areas. [Display omitted] •Cd content in vegetable species was in decreasing order of stem and bulb > leafy >solanaceous > bean cultivars.•Soil properties (pH, SOM, and CEC) play a more important role in Cd content in the vegetable.•The SSD curves indicated sensitivity variations of Cd in 32 vegetables.•The soil Cd threshold was classified and validated for the safety of vegetable production.