Journal of Guangxi Normal University(Natural Science Edition) ›› 2023, Vol. 41 ›› Issue (4): 231-242.doi: 10.16088/j.issn.1001-6600.2022102403

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Passivation Effect of Soil Conditioner on Soil Lead and Cadmium under Different Water Conditions

WANG Linqing1,2,3, YAN Tao4, CHEN Yongjian4, LI Furong2*, WANG Xu2, LI Wenying3, DU Ruiying2, YANG Xiuli2   

  1. 1. College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou Guangdong 510225, China;
    2. Institute of Quality Standard and Monitoring Technology for Agro-products, Guangdong Academy of Agricultural Sciences, Guangzhou Guangdong 501640, China;
    3. Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou Guangdong 510640, China;
    4. Guangdong Agricultural Monitoring Technology Co., Ltd., Guangzhou Guangdong 510640, China
  • Received:2022-10-24 Revised:2022-12-07 Online:2023-07-25 Published:2023-09-06

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Abstract: To ameliorate heavy metal pollution and improve safe utilization rate of farmland by combining agricultural measures and soil conditioners, this research explored the effects of soil conditioners (biochar and pectin) on soil physical and chemical properties and the passivation of heavy metals Pb and Cd under different water conditions (75% soil saturation moisture capacity and waterlogged condition). The typical vegetable soil in South China was chosen as the research subject with a soil culture experiment for 30 and 60 days. The results showed that the pH values were higher and the available heavy metal contents were lower under waterlogged condition than under 75% soil saturation moisture capacity. The application of biochar and pectin could increase soil pH value and organic matter contents under both the two water conditions, while the effects on soil alkali hydrolyzable nitrogen, available phosphorus and available potassium contents were different due to different water conditions. Under 75% soil saturation moisture capacity, the application of biochar and pectin could significantly reduce the available Cd contents in soil, which were lower with the application amount of the two conditioners increasing. However, under the waterlogged condition, the effect of pectin on soil available lead content with different biochar application amounts was not consistent, but the passivation effect of soil culture for 60 days was better than that for 30 days. The multivariate analysis of variance indicated that, in general, the types and formulations of soil conditioners had greater impact on the soil physical and chemical properties and the available heavy metal contents than other factors, such as soil incubation time and water conditions. Therefore, for the increasing shortage of cultivated land resources and the more urgent need to improve the quality of cultivated land soil, it is an effective way to reduce the heavy metal availability in the moderately contaminated farmland soil and realize the full and safe utilization of cultivated land by appropriate water management, adjustment of different cultivation modes and appropriate soil conditioners.

Key words: heavy metal, soil conditioner, water management, biochar, passivation effect

CLC Number:  X53; Q89
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