Effect of Different Passivators on Cadmium Contaminated Soil in Enshi

doi:10.11924/j.issn.1000-6850.casb2021-0108

Abstract

Abstract:

To solve the problem of heavy metal cadmium pollution in vegetable soil in mountainous areas of Enshi by applying different passivators, the passivation effects of different passivators on cadmium in soil and on the yield, quality and cadmium content of pakchoi were investigated by pot experiments. Five treatments were set up, including biochar, hydroxyapatite, lime powder, fly ash and mixed organic passivator. The results showed that the fresh weight and plant height of pakchoi were promoted by the treatments except lime powder, and the fresh weight of pakchoi increased by 109.72% in the fly ash treatment. Meanwhile, soil pH increased by 25.18%, 36.61% and 28.21% in the hydroxyapatite, lime powder and mixed organic passivator treatments, respectively. All treatments had no significant effect on the activities of urease, cellulase and sucrase in the soil. The biochar and mixed organic passivator treatments significantly increased phosphatase activity by 52.85% and 69.82%, while the lime powder treatment significantly inhibited the activity. Five treatments all reduced the cadmium content of pakchoi. Among them, biochar, hydroxyapatite, lime powder and mixed organic passivator all achieved significant inhibition effects on cadmium absorption, and the effect of lime powder was the best, reducing the cadmium content by 73.80%. All treatments had no significant effect on the quality of pakchoi. In addition, the biochar and mixed organic passivator treatments reduced the total cadmium content in soil by 27.21% and 46.98%, respectively, and the lime powder and mixed organic passivator treatments reduced the ion-exchange cadmium content by 43.67% and 47.35%, respectively. In conclusion, the application of the five passivators can reduce the cadmium content of pakchoi. Among them, the mixed organic passivator treatment can not only enhance enzyme activity, but also reduce the proportion of total cadmium and available cadmium (ionic and water-soluble) in soil without affecting the yield and quality of pakchoi.

Key words: Enshi, cadmium, soil heavy metal, passivator, pakchoi, enzyme activity, biomass

CLC Number:

MING Jiajia, XIANG Jiqian, KANG Yu, HUANG Lin, CHEN Yongbo, QU Yong, HU Baishun, YIN Hongqing. Effect of Different Passivators on Cadmium Contaminated Soil in Enshi[J]. Chinese Agricultural Science Bulletin, 2022, 38(1): 93-99.

Figures/Tables 7

References 42

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处理	pH	Cd/(mg/kg)	碱解氮/(mg/kg)	速效磷/(mg/kg)	速效钾/(mg/kg)	有机质/(g/kg)
土壤	5.96	0.59	231.0	50.17	269.0	16.08
生物炭	11.06	0.57
粉煤灰	5.64	1.17
羟基磷灰石	10.71	0.22
石灰粉	13.67	0.38
混合钝化剂	12.54	2.42

处理	pH	Cd/(mg/kg)	碱解氮/(mg/kg)	速效磷/(mg/kg)	速效钾/(mg/kg)	有机质/(g/kg)
土壤	5.96	0.59	231.0	50.17	269.0	16.08
生物炭	11.06	0.57
粉煤灰	5.64	1.17
羟基磷灰石	10.71	0.22
石灰粉	13.67	0.38
混合钝化剂	12.54	2.42

处理	鲜重/g	株高/cm
对照	27.87±6.91ab	20.75±0.25ab
生物炭	54.84±16.58ab	22.42±1.9ab
粉煤灰	58.45±19.74a	23.51±4.33ab
羟基磷灰石	56.36±15.04a	25.71±3.48a
石灰粉	16.61±6.14c	17.92±4.0b
混合钝化剂	38.71±22.67ab	22.15±6.4ab

处理	鲜重/g	株高/cm
对照	27.87±6.91ab	20.75±0.25ab
生物炭	54.84±16.58ab	22.42±1.9ab
粉煤灰	58.45±19.74a	23.51±4.33ab
羟基磷灰石	56.36±15.04a	25.71±3.48a
石灰粉	16.61±6.14c	17.92±4.0b
混合钝化剂	38.71±22.67ab	22.15±6.4ab