AI Article Synopsis

  • * Found that Pb content in edible parts of vegetables ranged from 0.02 to 0.49 mg·kg, with 20.49% of samples exceeding safety limits, and showed that leafy vegetables were most affected by Pb accumulation.
  • * Established a model indicating that soil pH is the most critical factor influencing Pb accumulation in vegetables and proposed classification thresholds for soil Pb levels to guide safe vegetable production practices: ≤ 100 mg·kg (priority protection), 100-353 mg·kg

Article Abstract

In order to ensure the safe production of vegetables in Pb-contaminated farmland under the complex interactions of an extreme geological background area and human activities in Southwest China, 32 types of widely planted vegetable varieties in the southwest region were collected. Correlation analysis, multiple linear regression analysis, and other methods were used to study the accumulation of Pb in soil-vegetables and the key constraints. The threshold of soil Pb ecological security in farmland in southwest China was determined by the method of species sensitivity distribution. The results showed that (Pb) of the soils was 47.59-462.38 mg·kg, which was 1.88 times higher than that of the background value of soil Pb in Yunnan Province (90 mg·kg), and 68.40% of the soil samples exceeded the screening value of the "Soil Environmental Quality Agricultural Land Soil Pollution Risk Management Standard" (GB 15618-2018). The content of Pb in the edible parts of vegetable crops ranged from 0.02 to 0.49 mg·kg, and the exceeding rate reached 20.49%. Pb concentration in the vegetables was in the decreasing sequence of leafy vegetables > roots and stems vegetables > eggplant vegetables > edible bean vegetables > pepper vegetables. Based on soil pH, OM, and CEC, the model of Pb accumulation in vegetables was constructed, in which pH was the first critical factor affecting Pb accumulation in vegetables. The sensitivity index of vegetable Pb species showed that leafy vegetables, eggplant vegetables, and a small number of frame bean vegetables were less sensitive to Pb. The soil Pb classification thresholds of the three types (priority protection, safe use, and strict control) of areas for vegetable safety production was ≤ 100, 100-353, and ≥ 353 mg·kg, respectively.

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http://dx.doi.org/10.13227/j.hjkx.202105032DOI Listing

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