Journal of Ecology and Rural Environment ›› 2023, Vol. 39 ›› Issue (2): 236-243.doi: 10.19741/j.issn.1673-4831.2021.0644

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Study on Cd Migration and Accumulation Characteristics and Influencing Factors of Soil-Dictyophora rubrovalvata System in Typical Karst Area of Guizhou

LIU Gui-hua1, WANG De-mei2, QIN Song1, CHAI Guan-qun1, LUOMU Xin-jian1, FAN Cheng-wu1   

  1. 1. Institute of Soil and Fertilizer, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China;
    2. College of Agriculture, Guizhou University, Guiyang 550025, China
  • Received:2021-10-20 Online:2023-02-25 Published:2023-02-24

Abstract: To explore the characteristics and influencing factors of the migration and accumulation of cadmium (Cd) in soil-Dictyophora rubrovalvata system in typical karst area, soil and Dictyophora rubrovalvata samples were collected. The contents of Cd and its occurrence forms in the soil, and the contents and bioaccumulation characteristics of Cd in Dictyophora rubrovalvata were analyzed, The factors affecting the migration and accumulation of Cd in the soil were discussed by principal component analysis. The results show that the total Cd contents of soil in the Dictyophora rubrovalvata planting area were between 0.24 and 4.23 mg·kg-1 and the average content was 0.96 mg·kg-1, which was 3.2 times that of the soil pollution risk screening value of agricultural land in GB 15618-2018 "Soil Environmental Quality Risk Control Standard for Soil Contamination of Agricultural Land (Trial)" and 1.45 times that of the soil background content value of Guizhou Province. The main form of Cd in soil was reducible (F2), and its relative content was 20.87%-63.81%, with an average value of 41.64%. The percentage contents of Cd in different forms were reducible state Cd (F2) > residual state Cd (F4) > weak acid soluble Cd (F1) > oxidable Cd (F3). The Cd contents of Dictyophora rubrovalvata ranged from 0.07 to 0.39 mg·kg-1 and the average content was 0.18 mg·kg-1 (in terms of fresh samples), lower than the standard value of GB 2762-2017 "National Standard for Food Safety:Limit of Pollutants in Food" (0.20 mg·kg-1), and the bioconcentration factor and translocation factor were 0.50-21.91 and 0.31-8.89, respectively. The pH value showed a negative correlation with the weak acid soluble Cd (r=-0.435, P<0.05, n=26), the Cd in Dictyophora rubrovalvata (r=-0.670, P<0.01) and the Cd accumulation coefficient of Dictyophora rubrovalvata (r=-0.724, P<0.01), whereas showed a positive correlation with the reducible Cd (r=0.469, P<0.05) and the soil total Cd concentration (r=0.392, P<0.05). The principal component analysis indicate that pH value, K, Ca, Fe and Cu contents were the main impacting factors to the enrichment of Cd in Dictyophora rubrovalvata.

Key words: karst area, Dictyophora rubrovalvata, Cd, translocation and accumulation, occurrence form

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