Abstract:

In this paper, the contents of heavy metals in soil profile of Golden Orchard in Chongqing were monitored, and pollution assessment was performed by using pollution indices based on soil environmental quality standard of producing area of green foods. The results showed that the single factor pollution indices of Cd in each park were higher than that of other heavy metals, 0~20 cm and 20~40 cm soil layers in loquat garden and grape garden, 0~20 cm soil layer in peach garden reached lightly polluted. The content of Cd in 20~40 cm soil layer in pear garden and blood orange garden, 0~20 cm soil layer in navel orange garden and cherry garden reached alert level. In addition, the contents of Pb in 0~20 cm soil layer in loquat garden and peach garden were also in alert level. Nemerow pollution indices of the soil in pear garden, mandarin orange garden, jujube garden, cherry garden, blood orange garden and navel orange garden were all less than 0.7, and soil environmental quality was judged as clean; Nemerow pollution indices of 0~20 cm soil layer in loquat garden, peach garden, grape garden was in the range of 0.7~1, and soil environmental quality was judged as nearly clean. Pollution investigation and evaluation results indicated the orchard should be taken measures to control Cd and Pb pollution in soil so as to improve fruit quality further.